The 126 Vacuum Tube Theremin

Published August 23, 2002
Updated December 10, 2013

Please refer to the REVISED version of this feature at
http://www.theremin.us/126/126revised.html



Contents

Legal Notice
Safety Notices
Acknowledgements
Introduction
Circuit Description
Circuit Revisions

Schematics
Construction
Test Voltages
Photos
Parts Tables
Drawing Index






Important Notice

I regret that schematic item X1* (ceramic filter) used for this design is no longer available through normal distribution.

*Toko part number ##AHCFM2-455DL






Legal Notice
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The information contained in this document is ©2002, 2003, 2005 by Arthur Harrison. Any reproduction of the information contained in this document, electronic or mechanical, shall only be used with Arthur Harrison's permission, and shall acknowledge him as the copyright holder and author.

Use of the information contained in this document for personal or commercial financial gain, such as the manufacture and sale of electronic musical instruments or parts thereof, is prohibited. Unless specifically stated in a written contract, Arthur Harrison grants no licence for the commercial exploitation of the concepts and designs embodied in this document. Refer licensing inquiries to: diy@harrisoninstruments.com.

The information contained in this document may only be reproduced in small quantities when the purpose for its use is the dissemination of information to students or hobbyists, and may not be distributed in any form, electronic or mechanical, for the purposes of any party engaged, directly or indirectly, in commercial enterprises.

Arthur Harrison assumes no liability for any damages, direct, or consequential, which may arise from the dissemination, application, or misapplication of the content contained in this site. The User of the information provided in this site assumes all responsibility for any damages, direct or consequential, which may arise from its use. Arthur Harrison retains the right to alter the content within this site at any time without notice.











Safety Notices
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Regarding the safety of your ears and hearing:

This circuit is recommended for users familiar with electronic theory and construction practices. It is recommended that suitable test equipment, including a frequency counter and oscilloscope, are available for making measurements.











Acknowledgements
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I express my sincere thanks to John Speulstra and Rick Hansen for their assistance in refreshing my knowledge of vacuum-tube techniques, and also to Steven Hasten for providing me with the incentive to pursue this design, and his construction efforts in verifying its performance.











Introduction
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This is my second vacuum-tube theremin design, which is an expansion of its predecessor, the pitch-only 125 theremin. The 126 theremin has both pitch and volume features, as well as a tone control.

As in the 125 theremin, I have designed the 126 entirely with the popular 12AU7 vacuum tube. The pitch section consists of the classical two-oscillator heterodyne configuration, and the volume section employs a slope-detection method, with a ceramic filter. The ceramic filter provides the high selectivity required for the small frequency changes induced by hand capacitance, replacing the elaborate and costly inductor-type circuits usually used for this purpose. As with the 125 theremin, exceptional frequency stability for temperature variation is achieved, both in the pitch and volume sections.

The 126 theremin is designed with a plate-antenna configuration, capitalizing on the hand-to-plate coupling efficiency offered by this method. As with most of my dual-parameter theremins, two horizontal 8-inch by 5 1/2-inch rectangular antennas, extending from each side of the instrument, provide the gestural interface. The 126 theremin exhibits at least 5 octaves of pitch variation over a sensing distance of about 18 inches, and at least 18dB of dynamic volume range over a sensing distance of about 9 inches, as illustrated in the following graphs:



The unique wave-shaping qualities of vacuum tubes, when operated in their non-linear region, are used in the 126 theremin, especially in the voltage-controlled amplifier section, where saturation techniques are employed to obtain warmth of tone character.

The 126 theremin may be heard by clicking on the mp3-file link below. The sample was recorded with the tone control in the fully-counterclockwise position.

126 Theremin Sound Sample
(179 kilobytes)











Circuit Description
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The volume circuit is shown on schematic page 1, below. Vacuum tube V1A and its associated components form a Colpitts oscillator that includes hand capacitance, via antenna A1, as a frequency determinant. X1, driven by the oscillator via C7, is a two-pole 455kHz ceramic filter that performs the function of a slope detector. With the hand away from the antenna, the oscillator frequency is at resonance with X1, and the greatest amplitude sine wave is present at X1's output. As the hand approaches the antenna, the oscillator diminishes in frequency, resulting in a diminished amplitude at X1.

V1B is configured as a cathode-follower, and provides an impedance buffer for X1. The output of V1B is AC-coupled through C9 to V2A, a diode-connected triode used as a DC restorer. V2A establishes the top of the voltage waveform at essentially zero volts. As a result, the volume hand's proximity controls the negative-peak amplitude of a sine wave present at the grid and plate of V2A. As the hand nears the antenna, the amplitude of the sine wave diminishes, moving its negative peak toward zero volts.

V2B is also a diode-connected triode which, in conjunction with C10 and R7, provides a DC level corresponding to the peak value of the sine wave. This DC level is applied to the grid of V3A via R8, which, with V3B, constitutes a differential amplifier. The audio signal from the pitch section (point "A" in the schematic) is also applied to the grid of V3A via coupling capacitor C11. As the DC grid voltage at V3A varies from the peak negative value to nearly zero, the tube is driven from cut-off to conduction. The amplitude of the audio waveform is accordingly varied at V3B's cathode, and reflected in V3B's plate, which provides the theremin's output. The DC volume control bias is removed from the output by capacitor C13. The circuit exhibits 18dB of dynamic range, which is commendable, considering its simplicity, and generally adequate for performance. The volume response curvature and dynamic range may vary with the particular tube used in the V3 position. Several tube brands, including "new-old stock" Amperex, Phillips, and RCA; and new Tesla brands were evaluated, all with sufficient performance.

The pitch circuit is shown on schematic page 2, below. V4 and associated components form a Colpitts oscillator that includes hand capacitance, via antenna A2, as a frequency determinant. Another oscillator, comprised of V6 and associated components, is the reference oscillator. The oscillators employ cathode-follower sections, V4A and V6A, to buffer their resonant networks from loading effects and to provide low impedance outputs. V5B is used as a mixer, with the pitch variable oscillator signal applied to its grid via capacitor C19 and the pitch reference oscillator signal applied to its cathode via resistor R21.

With tone-control potentiometer RV1 in the extreme counterclockwise position, the reference oscillator output is coupled to the mixer via C28. Electrical coupling between the two oscillators occurs because the signal at V5B's cathode includes the signal present at it's grid. This signal, from the variable oscillator, is reflected back into the reference oscillator, via V6A's cathode. Under this condition, the maximum amount of oscillator coupling produces the greatest amount of harmonic content in the audio waveform.

With RV1 in the extreme clockwise position, the reference oscillator's output is isolated from the mixer via V5A. In this condition, the mixer's cathode signal has less influence on the reference oscillator, because it is attenuated by RV1's 50k ohm resistance. As a result, the harmonic content of the audio waveform is comparatively reduced.

The heterodyne of the two oscillator frequencies is present at V5B's plate. Two sections of low-pass filtering reduce the sum frequency product; C21 in conjunction with V5B's plate-circuit resistance, and R22 with C22.

The oscillator frequencies are described by the following equation:

For the volume oscillator, L is 1mH, Ca is 330pF, Cb is 100pF, and Cc is the sum of C5, C6, and the A1 antenna capacitance. C5 is adjusted so that the volume oscillator's frequency is equal to X1's resonant frequency of 455kHz with the hand away from antenna A1.

For the pitch oscillators, L is 1mH, Ca is 1000pF, Cb is 330pF, and Cc is the A2 antenna capacitance (for the variable oscillator) or the value of the C24 pitch-zeroing capacitor (for the reference oscillator). Each of the pitch oscillator frequencies are typically 310kHz.

As in any heterodyne theremin, an essential requirement is that the two pitch oscillators are very close in frequency, so that an audible tone can be produced. Optimally, the theremin should provide a "zero-beat" condition with C24 set to its mid-capacitance point, with the hand away from the pitch antenna. A low frequency audible output should result when the hand is brought within 12 to 24 inches of the pitch antenna, increasing in frequency as the hand becomes closer.

In most instances, component tolerances will cause the pitch oscillator frequencies to be too far apart to produce an audible tone, so a calibration procedure must be performed. To do this, measure the frequency of the pitch reference oscillator by connecting a counter to the cathode of V6A, and record that frequency. Then, move the counter to the cathode of V4A, which is the output of the variable oscillator. With variable capacitor C24 set to midpoint, and antenna A2 clear of objects, adjust the frequency of the pitch variable oscillator to match the recorded frequency, with one or more of the following methods:

Volume circuit calibration is performed by observing the RF voltage waveform at V1B's cathode. With C5 approximately centered and the hand away from A1, the waveform amplitude should peak, indicating volume oscillator resonance with X1. This corresponds to the center frequency of X1, which is 455kHz. If this condition can not be obtained, then the volume oscillator's frequency may be adjusted with one or more of the following methods:

To eliminate the necessity for extensive trimming, the capacitors associated with the three oscillator frequency-determining networks (C2, C3, C6; C16, C17; C25, C26) should have ±5% or better tolerances. To ensure good frequency stability, these capacitors should be mica types, and the three oscillator coils, L1, L2, and L3 should be the J.W. Miller 4652 phenolic-core types specified. Capricious substitution of the coils may adversely affect or inhibit the theremin's operation.

Also for frequency stability, C5 and C24 should be air-variable types. Too much capacitance change per degree of shaft rotation will degrade adjustment resolution. Therefore, the maximum value of 27pF is recommended. Variable capacitors with a planetary reduction vernier will further enhance resolution. Such capacitors, with 3.75 turns of shaft rotation, are indicated in the schematic, and highly recommended.

The overall frequency of the theremin's operation may be changed with the substitution of frequency-determining components. However, the values indicated, providing approximately 310kHz in the pitch circuit and 455kHz in the volume circuit, were selected to prevent AM radio-band interference, while maintaining adequate hand-sensing distances.

The tone control's position has a slight effect on the pitch reference oscillator's frequency. Therefore, changing the tone will require a minor readjustment to pitch zero capacitor C24 for resetting the zero beat. However, this readjustment can be achieved very rapidly and conveniently.

The power supply is shown on schematic page 3, below. Voltage regulation is not employed in this circuit, since the oscillators exhibit excellent frequency stability with considerable supply variations. The total current drawn from the 50 volt supply is approximately 4mA. Heater transformer T2 is rated to provide 10 volts RMS for a 1.2A load. The six tubes use approximately 900mA of heater current, so T1's actual loaded output is about 11.5 volts RMS, which is adequate for the 12.6 volt-rated 12AU7s or ECC82s. The theremin's parameters stabilize after a brief warm-up period of about three minutes. Thermal coefficients in the circuits have negligible contribution to long-term drift, with parameter readjustment only required due to shifts in the player's stance, or pitch readjustment, if the tone setting is altered.

Some builders may wish to use alternative transformers to match their available mains voltage. If different transformers are used, measure the supply's output voltages while the theremin is connected, to ensure that the heater voltage is between 11.5 and 12.6 volts RMS AC, and that the B+ voltage is between 45 and 50 volts, DC.

To reduce the risk of injury, I designed this theremin with a maximum supply of approximately 50 volts, DC, which is considerably less than voltages used in many other vacuum-tube instruments. However, values substantially less than 50 volts can still be dangerous for conditions in which sufficient current is caused to flow through the body. Therefore, 330pF ceramic capacitors C4 and C15 provide a safety function by preventing the presence of +50 volts on the antennas.

SAFETY NOTICE:











Circuit Revisions
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Ceramic resonator X1 has been changed from Toko part number AHCFM2-455CL to Toko part number ##AHCFM2-455DL. "##" in the new part number denotes that it is lead-free (RoHS-compliant), and the "D" denotes a bandwidth of 10kHz, instead of the "C" version's 8kHz. Note that either the C or D version will work in the circuit, with only a minor variation in variable capacitor C5's setting required. A selected version of the newer device is available from Harrison Instruments as part number 99999-5915-455/10. This item is tested in a 126 Theremin circuit prior to sale, and selected for the best volume dynamic range, which varies considerably from different manufacturer lots.

R3 has been changed from 1M Ohm to 390K Ohm. This change improves the volume dynamic range by allowing the lowest volume to come closer to zero. R3 should be 390K for either type of ceramic resonator X1.

Page one of the schematic and the Parts List (item 126) reflect these two changes. The original (REV. 0) schematic may be viewed here.







Schematics
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Construction
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The 126 theremin, illustrated below, is constructed on a 8" x 12" x 1/16"-thick aluminum Theremin Mounting Plate. The theremin mounting plate is attached to a 11" x 17" x 1/2"-thick plywood Base with four threaded standoffs. The volume and pitch Antennas are 8" x 5 1/2" x 1/16"-thick aluminum plates that extend from the left and right edges of the base, respectively. The antennas are separated from the base with 1/2"-long threaded nylon standoffs to reduce their mutual capacitance, and connected to the circuit with 16 gauge solid bus wire. The wires are connected to the antennas with number-6 solder lugs, secured by one of the mounting screws at each antenna. The bottom of the base (not shown in the illustration) is equipped with an Atlas Sound type AD-11B threaded microphone stand adapter.


The theremin's components, including two connectors and their brackets, are mounted on the bottom of the theremin mounting plate, with the tube envelopes and the control shafts for C5, C24, and RV1 on the top. The six 3/4" holes for the tube sockets and two 5/8" holes for the variable capacitors can be made with suitable chassis punches (Greenlee types 730BB-3/4 and 730BB-5/8).

Refer to the Component Locations drawing. Screw-mounted Insulated Solder Turret Terminals provide junction points. Where required, component leads are insulated with 16 gauge Teflon® sleeving. Point-to point wiring is used, with 22 gauge, 19-strand Teflon®-insulated hookup wire, and 20 gauge solid tinned-copper bus wire, as required.

Regarding insulated hookup wire, the parts tables specify a variety of colors based upon wire function. Although color differentiation is good practice and recommended for electronic construction, the builder may elect to economize by using only one color.

SAFETY NOTICE:

Wires are anchored to the theremin mounting plate, as required, with adhesive-backed mounts and nylon cable ties. Leave a little slack in the leads of the three coils so that they can be moved with relation to the plate. This technique permits small variations in capacitance that may be used to fine-adjust oscillator frequencies. Keep frequency-determining components C2, C3, C6, C16, C17, C25, C26, L1, L2, and L3 clear of other parts and wires. To prevent audible hum from the heater circuit, twist the heater wires tightly together and route them in a direct manner away from signal paths.

Ceramic filter X1 has relatively delicate, closely-spaced leads, nominally intended for printed-circuit board installation. To adapt X1, it is recommended that its center lead be soldered directly to the top of its respective turret terminal, and that short pieces of 20 gauge bus wire are soldered to the outside leads at right angles, and extended to the tops of their turret terminals.

While assembling components onto the theremin mounting plate, temporarily attach four pair of long standoffs to the corner holes to protect the components from being damaged by the work surface:  Four standard 2 1/2" types on the top side of the plate, and four 2" male/female types on the bottom. Each male/female standoff has a stud inserted through its hole to engage a standard spacer. Once all the parts have been assembled onto the plate, the temporary standoffs may be removed, and replaced with four 1 1/4"-long standoffs which are used to attach the plate to the wood base.

Ground wiring can be "daisy-chained" in any convenient manner. Run a wire from each chain, as well as terminal 1 of power connector J1, to a single point on the metal chassis. The J2 output jack is a fully insulated type, to prevent audible hum from ground loop currents. Its sleeve terminal connects to the single-point ground, as well. Variable capacitors C5 and C24 have their "rotor" terminals connected to their frames, and therefore become electrically grounded by their mechanical attachments to the mounting plate. Each variable capacitor has four solder lugs that are redundant "stator" terminals. On each capacitor, only one of these terminals is connected to V1A's and V6B's plate, respectively.

For safety, power supply components J3, F1, SW1, T1, T2, BR1, C30, C31, and R28 are fully enclosed in a 5" x 6" x 4" aluminum utility cabinet, separate from the main assembly. J4 is an AC power inlet that mates with a 3-wire, grounded cord identical to the type used for most computers and test equipment. For construction simplicity, all the power supply parts are mounted to the inside surface of the utility cabinet's top panel, as illustrated in the Power Supply Lay-out drawing. Specific dimensions for the top panel are shown in the Power Supply Mounting Plate Hole Locations drawing. Note that the top panel is fabricated from 0.062"-thick aluminum, which replaces one of the two thinner, 0.040"-thick panels provided with the cabinet.

Adhesive-backed mounts and nylon cable ties are used to secure wires as required. The AC power inlet, fuse holder, switch, and transformer terminals are insulated with 1/8", 1/4, or 1/2"-diameter heat-shrink tubing, as required. Use the 1/2"-diameter tubing as an overall insulator for the rear of the fuse holder. Four self-adhesive feet are applied to the cabinet's bottom panel.

A four-wire extension cable with 9-pin "D" subminiature connectors connect the theremin assembly and power supply together. The length of the extension is optional, with about four feet being typical for extending from the floor to the top of a stand.

SAFETY NOTICES:  To prevent shock hazards from lethal mains voltage:

Test Voltages
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The following voltages are from the 126 theremin breadboard, measured with a Tektronix type 485 oscilloscope, and a 10Mohm, 10X-attenuation probe. A1 and A2 are substituted with 10pF mica capacitors connected from C4 and C15 to ground, respectively. RV1 is adjusted fully clockwise. V4 or V6 are removed for some steps to simplify measurements. Values may vary ±20% due to component tolerances and variations in test conditions. V1 and V2 values in this table have been revised for R3=390K per schematic page 1, revision 1.

Notes:

  1. Adjust C5 for peak amplitude. Peaks occur at two different points of rotation; adjust for the greater of the two values.
  2. Adjust C5 for peak DC offset of -3V. Peaks occur at two different points of rotation; adjust for the greater of the two values.
  3. Frequency determined by C24 adjustment.
  4. Remove V6 for this test.
  5. Remove V4 for this test.


-

TEST POINT

NOTE

VALUE

-
B+ BR1+

-

+46.6VDC with less than 60mV P-P of 60Hz + RF modulation
-
V1A plate V1-1 - 38V P-P RF sine wave centered at +44.0VDC
V1A grid V1-2 - 0V (ground)
V1A cathode V1-3 - 10V P-P RF sine wave centered at +5.0V
V1B plate V1-6 - +46.6VDC with less than 60mV P-P of 60Hz + RF modulation
V1B grid V1-7 1 6V P-P RF sine wave centered at +5.5V
V1B cathode V1-8 1 6.2V P-P RF sine wave centered at +6.3VDC
-
V2A plate V2-1 - 6.0V P-P RF sine wave centered at -2.6V
V2A grid V2-2 - 6.0V P-P RF sine wave centered at -2.6V
V2A cathode V2-3 - 0V (ground)
V2B plate V2-6 1 -5.3V
V2B grid V2-7 1 -5.3V
V2B cathode V2-8 - 6.0V P-P RF sine wave centered at -2.6VDC
-
V3A plate V3-1

-

+44.2V
V3A grid V3-2 2,3 Audio wave:
 0.8V P-P for 40Hz
 1.0V P-P for 440Hz
 0.6V P-P for 1850Hz
V3A cathode V3-3 - +2.4V
V3B plate V3-6

-

Audio wave:
 0.6V P-P for 40Hz
 0.8V P-P for 440Hz
 0.4V P-P for 1850Hz
V3B grid V3-7

-

0V (ground)
V3B cathode V3-8

-

+2.4V
-
V4A plate V4-1 4 +46.6VDC with less than 60mV P-P of 60Hz + RF modulation
V4A grid V4-2 4 8V P-P RF sine wave centered at 0V
V4A cathode V4-3 4 4.5V P-P RF sine wave centered at +2.7V
V4B plate V4-6 4 29V P-P RF sine wave centered at +46.6V
V4B grid V4-7 4 0V (ground)
V4B cathode V4-8 4 4.5V P-P RF sine wave centered at +4V
-
V5A plate V5-1 - +46.6VDC with less than 60mV P-P of 60Hz + RF modulation
V5A grid V5-2 - 4.4V P-P RF sine wave centered at +4V
V5A cathode V5-3 - 3.5V P-P RF sine wave centered at +3.6V
V5B plate V5-6 - Audio wave with 100mV RF modulation. Audio frequency determined by C24 adjustment.
V5B grid V5-7 - 4.5V P-P RF sine wave centered at 0V
V5B cathode V5-8 - 3.4V P-P heterodyne wave centered at +2.4V
-
V6A plate V6-1 5 +46.6VDC with less than 60mV P-P of 60Hz + RF modulation
V6A grid V6-2 5 8V P-P RF sine wave centered at 0V
V6A cathode V6-3 5 4.5V P-P RF sine wave centered at +2.7V
V6B plate V6-6 5 29V P-P RF sine wave centered at +46.6V
V6B grid V6-7 5 0V (ground)
V6B cathode V6-8 5 4.5V P-P RF sine wave centered at +4V











Photos
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These are two photos of the 126 Theremin prototype, courtesy of Jack Hurwitz.








Johannes Graenzer of Bayreuth, Germany constructed this 126 Theremin with monopole antennas for his university project. He reports that the instrument worked "immediately... and sounds nearly as good as C. Rockmore's if you play it by making a little vibrato..."










David Hunter of Toronto, Canada, built this 126 Theremin. The power supply is in the base, along with a speaker and amplifier.









Christopher Billey submitted this picture of his 126 Theremin. His version uses traditional antennas. It is his first vacuum tube theremin, and he reports that he is "very pleased with pitch range and sound quality." Christopher has more information abouthis theremin on his webpage.









Brendan Pope, an 18 year-old student from North Carolina, built this version of the 126 Theremin for his school project. It is the first theremin he has ever owned or built. Brendon relates "Its sound is supreme to any other homemade theremin I've heard."









Tomislav Ribicic of Croatia built this beautiful version of the 126 Theremin. The custom shellaced and waxed wood cabinet is topped by a stainless steel chassis plate. Traditional rod and loop antennas were used. Tomisalv reports that the theremin "sounds fabulous." He plans to install the instrument in the Caffe Jazz Tunel in Rijeka.








Yaroslav Sadovskiy of Moscow, Russia built this amazing version of the 126 Theremin. The six vacuum tubes are illuminated by LEDs, and the legends, laser cut into stainless steel plate, are likewise illuminated. Yaroslav reports good pitch sensing distance with the telescoping antenna, which also serves to fine-tune the theremin's zero in lieu of vernier capacitors. The wood sides add a "touch of vintageness," per Yaroslav, who also reports that the 126 "has the pure, classic theremin sound." The author is very pleased to have this wonderful 126 created in the city where Leon Theremin worked for a decade at the Moscow Conservatory of Music.








Eric Reiswig from Canada built this excellent 126 Theremin with traditional loop and rod antennas fabricated from 3/8-inch diameter brass tubing. He incorporated the use of an IC reversing circuit to permit optional "closer-for-softer" volume response, and has expressed great satisfaction with the instrument's sound qualities. Eric's work is documented on his theremin webpage.






Jeremy Merrill constructed this beautiful 126 Theremin in a wormy chestnut cabinet with a stainless steel chassis inset. He reports that the tone is excellent, and that his success has inspired him to build additional vacuum tube projects. The antennas are copper tubing, and the stand was adapted from a lamp.





Parts Tables
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Table 1 Theremin Assembly Schematic-designated Items
Table 2 Power Supply Assembly Schematic-designated Items
Table 3 Theremin Assembly Hardware Items
Table 4 Power Supply Assembly Hardware Items
Table 5 Base Assembly Items
Table 6 Cable Assembly Items
Table 7 Fixture Items



Parts Table 1 ^
Theremin Assembly Schematic-designated Items
LINE ITEM DESCRIPTION VALUE MANUFACTURER

MANUFACTURER PART
NUMBER

SUPPLIER SUPPLIER
STOCK
NUMBER
QTY
101† A1,A2 ANTENNA
(PER DRAWING)

(SEE NOTE 1,
ABOVE)
. . . MCMASTER-CARR 89015K37 1
102 C1,C12,
C14,C20,
C23
ELECTROLYTIC
CAPACITOR
10uF ±20%,
100V,
105°C,
RADIAL,
6.3mm D
x 11mm L
NICHICON UPW2A100MED MOUSER
ELECTRONICS
647-
UPW2A100MED
5
103 C2,C17,
C26
MICA
CAPACITOR
330pF ±5%,
500V
CORNELL
DUBILIER
CD19FD331JO3 MOUSER
ELECTRONICS
5982-
19-500V330
3
104 C3 MICA
CAPACITOR
100pF ±5%,
500V
CORNELL
DUBILIER
CD15FD101JO3 MOUSER
ELECTRONICS
5982-
15-500V100
1
105 C4,C15 CERAMIC
CAPACITOR
330pF ±10%,
X7R,
200V,
RADIAL
KEMET C052K331K2X5CA MOUSER
ELECTRONICS
80-
CK05BX331K
2
106 C5,C24 VARIABLE
CAPACITOR
6.2-27pF,
7.5:1
VERNIER
HARRISON
INSTRUMENTS
99999-
5910-7-27R0
HARRISON
INSTRUMENTS
99999-
5910-7-27R0
2
107 C6 MICA
CAPACITOR
10pF ±5%,
500V
CORNELL
DUBILIER
CD10CD100DO3 MOUSER
ELECTRONICS
5982-
10-500V10
1
108 C7,C8,
C21,C22
CERAMIC
CAPACITOR
1000pF ±10%,
X7R,
200V,
RADIAL
KEMET C052K102K2X5CA MOUSER
ELECTRONICS
80-
CK05BX102K
4
109 C9,C10
C11,C13,
C18,C19,
C27,C28,
C29
METALLIZED
POLYESTER
CAPACITOR
0.01uF ±5%,
400V,
AXIAL
VISHAY/
ROEDERSTEIN
MKT1813310404 MOUSER
ELECTRONICS
75-
MKT1813310404
9
110 C16,C25 MICA
CAPACITOR
1000pF ±5%,
500V
CORNELL
DUBILIER
CD19FD102JO3 MOUSER
ELECTRONICS
5982-
19-500V1000
2
111† J1 CONNECTOR 9 POSITION,
MALE
CONTACTS,
D-SUBMIN-
IATURE
CINCH DEH-9P MOUSER
ELECTRONICS
538-DEH-9P 1
112† J2 PHONE JACK, WITH HARDWARE 1/4",
INSULATED,
MONOPHONIC
SWITCHCRAFT N111X MOUSER
ELECTRONICS
502-N-111X 1
113 L1, L2,
L3
INDUCTOR,
THREE-SECTION,
UNIVERSAL
"PIE" WOUND
1 mH ±5%,
19 OHM,
Q=59 @ 0.25MHz,
SRF=3.7MHz MINIMUM
J.W. MILLER 4652 HARRISON
INSTRUMENTS
96804-4652 3
114 R1,R6,
R13,R18,
R23
RESISTOR 5600 OHM ±5%,
1/2W,
CARBON FILM
XICON 293-5.6K-RC MOUSER
ELECTRONICS
293-5.6K-RC 5
115 R2 RESISTOR 33.2K OHM ±1%,
1/2W,
METAL FILM
XICON 273-33.2K-RC MOUSER
ELECTRONICS
273-33.2K-RC 1
116 R3 RESISTOR 390K OHM ±5%,
1/2W,
CARBON FILM
XICON 293-390K-RC MOUSER
ELECTRONICS
293-390K-RC 1
117 R4, R7,
R8, R12,
R15, R17,
R25
RESISTOR 1M OHM ±5%,
1/2W,
CARBON FILM
XICON 293-1M-RC MOUSER
ELECTRONICS
293-1M-RC 7
118 R5 RESISTOR 150K OHM ±5%,
1/2W,
CARBON FILM
XICON 293-150K-RC MOUSER
ELECTRONICS
293-150K-RC 1
119 R9,R10, R11 RESISTOR 10K OHM ±5%,
1/2W,
CARBON FILM
XICON 293-10K-RC MOUSER
ELECTRONICS
293-10K-RC 3
120 R14,R24 RESISTOR 39.2K OHM ±1%,
1/2W,
METAL FILM
XICON 273-39.2K-RC MOUSER
ELECTRONICS
273-39.2K-RC 2
121 R16,R26,
R27
RESISTOR 3900 OHM ±5%,
1/2W,
CARBON FILM
XICON 293-3.9K-RC MOUSER
ELECTRONICS
293-3.9K-RC 3
122 R19 RESISTOR 100K OHM ±5%,
1/2W,
CARBON FILM
XICON 293-100K-RC MOUSER
ELECTRONICS
293-100K-RC 1
123 R20,R21,
R22
RESISTOR 39K OHM ±5%,
1/2W,
CARBON FILM
XICON 293-39K-RC MOUSER
ELECTRONICS
293-39K-RC 3
124 RV1 POTENTIOMETER,
WITH HARDWARE
50K OHM ±20%,
0.25 WATT,
CARBON COMPOSITION,
AUDIO
TAPER
,
WITH
MOUNTING
NUT AND
FLAT WASHER
ALPHA RV24AF-10-
15R1-A50K-3
MOUSER
ELECTRONICS
31VJ405-F3 1
125 V1,V2,
V3,V4,
V5,V6
VACUUM TUBE,
DUAL TRIODE
. TESLA ECC82 ANTIQUE
ELECTRONICS
SUPPLY
T-12AU7-JJ 6
126 X1 CERAMIC FILTER 455KhZ ±1KhZ,
10kHz
6dB
BANDWIDTH
TOKO ##AHCFM2-455DL NO KNOWN SOURCE
OF SUPPLY
99999-5915-455/10 1


Parts Table 2 ^
Power Supply Assembly Schematic-designated Items
LINE ITEM DESCRIPTION VALUE MANUFACTURER MANUFACTURER PART NUMBER SUPPLIER SUPPLIER STOCK NUMBER QTY
201 BR1 RECTIFIER BRIDGE 6A,
200V
RECTRON BR62 MOUSER
ELECTRONICS
583-BR62 1
202 C30,31 ELECTROLYTIC CAPACITOR 330uF ±20%,
100V,
105°C,
AXIAL,
16mm D x 33mm L
XICON 140-TG331M2A-1633-RC MOUSER
ELECTRONICS
140-
TG331M2A-1633-RC
2
203 F1 CARTRIDGE FUSE 1/8A,
250V,
SLOW-ACTING,
0.25" D x 1.25" L
LITTELFUSE 576-0313.125MXP MOUSER
ELECTRONICS
576-0313.125MXP 1
204† J3 CONNECTOR 9 POSITION,
FEMALE CONTACTS,
D-SUBMIN-
IATURE
CINCH DEH-9S MOUSER
ELECTRONICS
538-DEH-9S 1
205 J4 AC POWER INLET 250VAC,
15A,
CLASS 1
DGS PRO-AUDIO 161-0707-1-E MOUSER
ELECTRONICS
161-0707-1-E 1
206 R28 RESISTOR 100 OHM ±5%,
1/2W,
CARBON FILM
XICON 293-100-RC MOUSER
ELECTRONICS
293-100-RC 1
207 SW1 SWITCH, TOGGLE,
WITH
HARDWARE
6A,
250V,
SPDT
NKK M2012SS1W01 MOUSER
ELECTRONICS
633-M201201 1
208 T1 TRANSFORMER

(SEE NOTE 3,
ABOVE)

PRIMARY:
120V, 60Hz
SECONDARY:
28V, 85mA
SIGNAL TRANSFORMER COMPANY 241-3-28 SIGNAL
TRANSFORMER
COMPANY
241-3-28 1
209 T2 TRANSFORMER

(SEE NOTE 3,
ABOVE)

PRIMARY:
120V, 60Hz
SECONDARY:
10V, 1.2A
SIGNAL TRANSFORMER COMPANY 241-5-10 SIGNAL
TRANSFORMER
COMPANY
241-5-10 1


Parts Table 3 ^
Theremin Assembly Hardware Items
LINE ITEM DESCRIPTION MANUFACTURER

MANUFACTURER PART
NUMBER

SUPPLIER SUPPLIER
STOCK
NUMBER
QTY
301† THEREMIN MOUNTING PLATE (PER DRAWING) . . MCMASTER-CARR 89015K37 1
302 STANDOFF, THEREMIN MOUNTING PLATE 6-32 x
1.25" L,
HEXAGONAL,
ALUMINUM
KEYSTONE 1818 MOUSER
ELECTRONICS
534-1818 4
303 MACHINE SCREW, STANDOFF, THEREMIN MOUNTING PLATE PAN HEAD,
SLOTTED,
6-32 x 0.375",

STAINLESS STEEL
. . MCMASTER-CARR 91792A146
(PACKAGE OF 100)
4
304† FLAT WASHER, STANDOFF, THEREMIN MOUNTING PLATE #6,
0.312" O.D.,

STAINLESS STEEL
. . MCMASTER-CARR 98019A314
(PACKAGE OF 500)
4
305† LOCK WASHER, STANDOFF, THEREMIN MOUNTING PLATE #6 SPLIT-RING,
0.250" O.D.,
STAINLESS STEEL
. . MCMASTER-CARR 92146A540
(PACKAGE OF 100)
4
306 BRACKET, OUTPUT JACK (PER DRAWING) . . MCMASTER-CARR 8199K13 1
307† MACHINE SCREW, BRACKET, OUTPUT JACK PAN HEAD,
SLOTTED,
4-40 x 0.312",
STAINLESS STEEL
. . MCMASTER-CARR 91792A107
(PACKAGE OF 100)
2
308† FLAT WASHER, BRACKET, OUTPUT JACK #4,
0.250" O.D.,
STAINLESS STEEL
. . MCMASTER-CARR 98019A309
(PACKAGE OF 500)
2
309† LOCK WASHER, BRACKET, OUTPUT JACK #4 SPLIT-RING,
0.209 O.D.,
STAINLESS STEEL
. . MCMASTER-CARR 92146A530
(PACKAGE OF 100)
2
310† NUT, BRACKET, OUTPUT JACK HEX,
4-40 x 0.250",
STAINLESS STEEL
. . MCMASTER-CARR 91841A005
(PACKAGE OF 100)
2
311 BRACKET,
POWER CONNECTOR
(MODIFIED PER
DRAWING
)
KEYSTONE 621 MOUSER
ELECTRONICS
534-621 2
312† MACHINE SCREW, BRACKET, POWER CONNECTOR PAN HEAD,
SLOTTED,
4-40 x 0.250",
STAINLESS STEEL
. . MCMASTER-CARR 91792A106
(PACKAGE OF 100)
2
313† FLAT WASHER, BRACKET, POWER CONNECTOR #4,
0.250" O.D.,
STAINLESS STEEL
. . MCMASTER-CARR 98019A309
(PACKAGE OF 500)
2
314† LOCK WASHER, BRACKET, POWER CONNECTOR #4 SPLIT-RING,
0.209 O.D.,
STAINLESS STEEL
. . MCMASTER-CARR 92146A530
(PACKAGE OF 100)
2
315† JACK SCREW WITH HARDWARE, POWER CONNECTOR 4-40,
0.250" L
STUD
KEYSTONE . MOUSER
ELECTRONICS
534-7229
2
316† TERMINAL INSULATED,
SOLDER TURRET,
4-40 INTERNAL THREAD
WEARNES
CAMBION
572-4814-
01-05-16
BISCO
INDUSTRIES
572-4814-
01-05-16
49
317† MACHINE SCREW, TERMINAL PAN HEAD,
SLOTTED,
4-40 x 0.250",
STAINLESS STEEL
. . MCMASTER-CARR 91792A106
(PACKAGE OF 100)
49
318† FLAT WASHER, TERMINAL #4,
0.250" O.D.,
STAINLESS STEEL
. . MCMASTER-CARR 98019A309
(PACKAGE OF 500)
49
319† LOCK WASHER, TERMINAL #4 SPLIT-RING,
0.209 O.D.,
STAINLESS STEEL
. . MCMASTER-CARR 92146A530
(PACKAGE OF 100)
49
320 SOCKET, TUBE 9-PIN,
MINIATURE,
WITH SHIELD RETAINER,
0.750" DIAMETER MTG HOLE,
TOP-MOUNTED
BELTON VT-9-ST-C TUBE DEPOT SK-B-VT9-ST-C 6
321† MACHINE SCREW, TUBE SOCKET PAN HEAD,
SLOTTED,
4-40 x 0.312",
STAINLESS STEEL
. . MCMASTER-CARR 91792A107
(PACKAGE OF 100)
12
322† FLAT WASHER, TUBE SOCKET #4,
0.250" O.D.,
STAINLESS STEEL
. . MCMASTER-CARR 98019A309
(PACKAGE OF 500)
12
323† LOCK WASHER, TUBE SOCKET #4 SPLIT-RING,
0.209 O.D.,
STAINLESS STEEL
. . MCMASTER-CARR 92146A530
(PACKAGE OF 100)
12
324† NUT, TUBE SOCKET HEX,
4-40 x 0.250",
STAINLESS STEEL
. . MCMASTER-CARR 91841A005
(PACKAGE OF 100)
12
325 MACHINE SCREW, VARIABLE CAPACITOR PAN HEAD,
SLOTTED,
6-32 x 0.250",
STAINLESS STEEL
. . MCMASTER-CARR 91792A144
(PACKAGE OF 100)
4
326† FLAT WASHER, VARIABLE CAPACITOR #6,
0.312" O.D.,
STAINLESS STEEL
. . MCMASTER-CARR 98019A314
(PACKAGE OF 500)
4
327† LOCK WASHER, VARIABLE CAPACITOR #6 SPLIT-RING,
0.250" O.D.,
STAINLESS STEEL
. . MCMASTER-CARR 92146A540
(PACKAGE OF 100)
4
328 KNOB, WITH SET SCREW 25/32" D,
15/32" H,
FOR 0.250" SHAFT,
PHENOLIC,
BLACK
DAVIES 1100 MOUSER
ELECTRONICS
5164-1100 3
329† LUG, GROUNDING #4,
INTERNAL TOOTH,
0.63" x 0.31"
KEYSTONE 908 MOUSER
ELECTRONICS
534-908 1
330† MACHINE SCREW, LUG, GROUNDING PAN HEAD,
SLOTTED,
4-40 x 0.250",
STAINLESS STEEL
. . MCMASTER-CARR 91792A106
(PACKAGE OF 100)
1
331† FLAT WASHER, LUG, GROUNDING #4,
0.250" O.D.,
STAINLESS STEEL
. . MCMASTER-CARR 98019A309
(PACKAGE OF 500)
1
332† NUT, LUG, GROUNDING HEX,
4-40 x 0.250",
STAINLESS STEEL
. . MCMASTER-CARR 91841A005
(PACKAGE OF 100)
1
333† WIRE, HOOKUP, DC RETURN BLACK,
22 GAUGE,
TEFLON® INSULATED,
100' ROLL
WEICO WIRE M16878/4BFE-0 WEICO WIRE & CABLE 2122/19-BLACK
(ROLL OF 100')
A/R
334† WIRE, HOOKUP, B+ RED,
22 GAUGE,
TEFLON® INSULATED,
100' ROLL
WEICO WIRE M16878/4BFE-2 WEICO WIRE & CABLE 2122/19-RED
(ROLL OF 100')
A/R
335 WIRE, HOOKUP, SIGNAL BLUE,
22 GAUGE,
TEFLON® INSULATED,
100' ROLL
WEICO WIRE M16878/4BFE-6 WEICO WIRE & CABLE 2122/19-BLUE
(ROLL OF 100')
A/R
336† WIRE, HOOKUP, HEATER GRAY,
22 GAUGE,
TEFLON® INSULATED,
100' ROLL
WEICO WIRE M16878/4BFE-8 WEICO WIRE & CABLE 2122/19-GRAY
(ROLL OF 100')
A/R
337† WIRE, BUS 20 GAUGE,
TINNED COPPER,
100' ROLL
WEICO WIRE 9020 WEICO WIRE & CABLE 9020
(ROLL OF 100')
A/R
338 WIRE, BUS, ANTENNA LEAD-IN 16 GAUGE,
TINNED COPPER,
100' ROLL
WEICO WIRE 9016 WEICO WIRE & CABLE 9016
(ROLL OF 100')
A/R
339 SLEEVING,
INSULATION
16 GAUGE,
TEFLON®,
100' ROLL
WEICO WIRE TS-16 WEICO WIRE & CABLE TS-16
(ROLL OF 100')
A/R
340 LUG, ANTENNA #6,
INTERNAL TOOTH,
0.63" x 0.31"
KEYSTONE 914 MOUSER
ELECTRONICS
534-914 2
341 WIRE TIE NYLON,
3.9" L
PANDUIT PLT1M-C MOUSER
ELECTRONICS
644-PLT1M-C A/R
342 ANCHOR, WIRE TIE NYLON,
1/2" SQ
PANDUIT ABM1M-A-M MOUSER
ELECTRONICS
644-ABM1M-A-M A/R


Parts Table 4 ^
Power Supply Assembly Hardware Items
LINE ITEM DESCRIPTION MANUFACTURER

MANUFACTURER PART
NUMBER

SUPPLIER SUPPLIER
STOCK
NUMBER
QTY
401† POWER SUPPLY
MOUNTING PLATE
(PER DRAWING) . . MCMASTER-CARR 89015K37 1
402 UTILITY CABINET,
POWER SUPPLY,
WITH HARDWARE
2-PANEL,
ALUMINUM,
5" x 6" x 4"
BUD INDUSTRIES AU-1029 MOUSER
ELECTRONICS
563-AU-1029NF 1
403 FOOT, UTILITY CABINET 0.81" SQ x 0.3" H,
SELF ADHESIVE, GRAY
3M SJ-5023GY MOUSER
ELECTRONICS
517-SJ-
5023GY
4
404 MACHINE SCREW,
AC POWER
INLET MOUNTING
FLAT HEAD,
SLOTTED,
4-40 x 0.375",
STAINLESS STEEL
. . MCMASTER-CARR 91781A108
FLAT HEAD
(PACKAGE OF 100)
2
405† NUT,
AC POWER
INLET MOUNTING
HEX,
4-40 X 0.250",
STAINLESS STEEL
. . MCMASTER-CARR 91841A005
(PACKAGE OF 100)
2
406† FLAT WASHER,
AC POWER
INLET MOUNTING
#4,
0.250" 0.D.,
STAINLESS STEEL
. . MCMASTER-CARR 98019A309
(PACKAGE OF 500)
2
407† LOCK WASHER,
AC POWER
INLET MOUNTING
#4 SPLIT-RING,
0.209" O.D.,
STAINLESS STEEL
. . MCMASTER-CARR 92146A530
(PACKAGE OF 100)
2
408† LUG, GROUND #4,
INTERNAL TOOTH,
0.63" x 0.31"
KEYSTONE 908 MOUSER
ELECTRONICS
534-908 1
409† MACHINE SCREW, LUG, GROUND PAN HEAD,
SLOTTED,
4-40 x 0.250",
STAINLESS STEEL
. . MCMASTER-CARR 91792A106
(PACKAGE OF 100)
1
410† FLAT WASHER, LUG, GROUND #4,
0.250" O.D.,
STAINLESS STEEL
. . MCMASTER-CARR 98019A309
(PACKAGE OF 500)
1
411† NUT, LUG, GROUND HEX,
4-40 x 0.250",
STAINLESS STEEL
. . MCMASTER-CARR 91841A005
(PACKAGE OF 100)
1
412† MACHINE SCREW, TRANSFORMER PAN HEAD,
SLOTTED,
6-32 x 0.437",
STAINLESS STEEL
. . MCMASTER-CARR 91792A147
(PACKAGE OF 100)
4
413† FLAT WASHER, TRANSFORMER #6,
0.312 O.D., STAINLESS STEEL
. . MCMASTER-CARR 98019A314
(PACKAGE OF 100)
4
414† LOCK WASHER, TRANSFORMER #6 SPLIT-RING, 0.250" O.D., STAINLESS STEEL . . MCMASTER-CARR 92146A540
(PACKAGE OF 100)
4
415† NUT, TRANSFORMER HEX,
6-32 x 0.250", SMALL PATTERN, STAINLESS STEEL
. . MCMASTER-CARR 90730A007
(PACKAGE OF 100)
4
416† MACHINE SCREW,
BRIDGE RECTIFIER
PAN HEAD,
SLOTTED,
6-32 x 0.437", STAINLESS STEEL
. . MCMASTER-CARR 91792A147
(PACKAGE OF 100)
1
417† FLAT WASHER,
BRIDGE RECTIFIER
#6,
0.312" 0.D.,
STAINLESS STEEL
. . MCMASTER-CARR 98019A314
(PACKAGE OF 500)
1
418† LOCK WASHER,
BRIDGE RECTIFIER
#6 SPLIT-RING,
0.250" O.D.,
STAINLESS STEEL
. . MCMASTER-CARR 92146A540
(PACKAGE OF 100)
1
419† NUT,
BRIDGE RECTIFIER
HEX,
6-32 x 0.250",
SMALL PATTERN
STAINLESS STEEL,
. . MCMASTER-CARR 90730A007
(PACKAGE OF 100)
1
420† TERMINAL INSULATED,
SOLDER TURRET,
4-40
INTERNAL THREAD
WEARNES
CAMBION
572-4814-
01-05-16
BISCO
INDUSTRIES
572-4814-
01-05-16
4
421† MACHINE SCREW,
TERMINAL
PAN HEAD,
SLOTTED,
4-40 x 0.250",
STAINLESS STEEL
. . MCMASTER-CARR 91792A106
(PACKAGE OF 100)
4
422† FLAT WASHER,
TERMINAL
#4,
0.250" O.D.,
STAINLESS STEEL
. . MCMASTER-CARR 98019A309
(PACKAGE OF 500)
4
423† LOCK WASHER,
TERMINAL
#4 SPLIT-RING,
0.209 O.D.,
STAINLESS STEEL
. . MCMASTER-CARR 92146A530
(PACKAGE OF 100)
4
424† JACK SCREW WITH HARDWARE, POWER CONNECTOR 4-40,
0.250" L STUD
KEYSTONE 7229 MOUSER
ELECTRONICS
534-7229 2
425† WIRE, HOOKUP, TRANSFORMER PRIMARY LINE BLACK,
22 GAUGE,
TEFLON®
INSULATED,
100' ROLL
WEICO WIRE M16878/4BFE-0 WEICO WIRE & CABLE 2122/19-BLACK
(ROLL OF 100')
A/R
426† WIRE, HOOKUP, B+ RED,
22 GAUGE,
TEFLON®
INSULATED,
100' ROLL
WEICO WIRE M16878/4BFE-2 WEICO WIRE & CABLE
2122/19-RED
(ROLL OF 100')
A/R
427 WIRE, HOOKUP,
B+ TRANSFORMER
SECONDARY
YELLOW,
22 GAUGE,
TEFLON®
INSULATED,
100' ROLL
WEICO WIRE M16878/4BFE-4 WEICO WIRE & CABLE
2122/19-YELLOW
(ROLL OF 100')
A/R
428 WIRE, HOOKUP,
SAFETY GROUND
GREEN,
22 GAUGE,
TEFLON®
INSULATED,
100' ROLL
WEICO WIRE M16878/4BFE-5 WEICO WIRE & CABLE
2122/19-GREEN
(ROLL OF 100')
A/R
429† WIRE, HOOKUP,
HEATER
TRANSFORMER
SECONDARY
GRAY,
22 GAUGE,
TEFLON®
INSULATED,
100' ROLL
WEICO WIRE M16878/4BFE-8 WEICO WIRE & CABLE
2122/19-GRAY
(ROLL OF 100')
A/R
430 WIRE, HOOKUP,
TRANSFORMER
PRIMARY NEUTRAL
WHITE,
22 GAUGE,
TEFLON®
INSULATED,
100' ROLL
WEICO WIRE M16878/4BFE-9 WEICO WIRE & CABLE
2122/19-WHITE
(ROLL OF 100')
A/R
431† WIRE, BUS 20 GAUGE,
TINNED COPPER,
100' ROLL
WEICO WIRE 297 SV005 WEICO WIRE & CABLE 602-297-100 A/R
432 TUBING,
HEAT-SHRINKABLE
POLYOLEFIN,
BLACK,
0.125"O.D.,
48"
3M FP301 1/8 BLACK MOUSER
ELECTRONICS
5174-1181 A/R
433 TUBING,
HEAT-SHRINKABLE
POLYOLEFIN,
BLACK,
0.250"O.D.,
48"
3M FP301 1/4 BLACK MOUSER
ELECTRONICS
5174-1141 A/R
434 TUBING,
HEAT-SHRINKABLE
POLYOLEFIN,
BLACK,
0.500"O.D.,
48"
3M FP301 1/2 BLACK MOUSER
ELECTRONICS
5174-1121 A/R


Parts Table 5 ^
Base Assembly Items
LINE ITEM DESCRIPTION MANUFACTURER

MANUFACTURER PART
NUMBER

SUPPLIER SUPPLIER
STOCK
NUMBER
QTY
501 BASE (SEE NOTE 2,
ABOVE)
. . . . 1
502 STANDOFF,
ANTENNA
6-32 x
0.500 L,
HEXAGONAL,
NYLON
KEYSTONE 1903C MOUSER
ELECTRONICS
534-1903C 8
503† MACHINE SCREW,
ANTENNA
PAN HEAD,
SLOTTED,
6-32 x 0.312",
STAINLESS STEEL
. . MCMASTER-CARR 91792A145
(PACKAGE 0F 100)
8
504† FLAT WASHER,
ANTENNA
#6,
0.312" O.D.,
STAINLESS STEEL
. . MCMASTER-CARR 98019A314
(PACKAGE OF 500)
8
505† LOCK WASHER,
ANTENNA
#6 SPLIT-RING,
0.250" O.D.,
STAINLESS STEEL
. . MCMASTER-CARR 92146A540
(PACKAGE OF 100)
8
506 MACHINE SCREW,
BASE
FLAT HEAD,
SLOTTED,
6-32 x 0.625",
STAINLESS STEEL
. . MCMASTER-CARR 91781A150
FLAT HEAD
(PACKAGE OF
100)
12
507 ADAPTER,
MICROPHONE
STAND
1.75" O.D.,
0.71" H,
5/8-27
INTERNAL THREAD
ATLAS SOUND AD-11B HARRISON
INSTRUMENTS
99999-AD-11B 1
508 THREAD-FORMING SCREW,
ADAPTER
PAN HEAD,
TYPE A,
PHILLIPS,
#6 X 1/2"
,
STAINLESS STEEL
. . MCMASTER-CARR 92470A148
(PACKAGE OF 100)
3


Parts Table 6 ^
Cable Assembly Items
LINE ITEM DESCRIPTION VALUE MANUFACTURER

MANUFACTURER PART
NUMBER

SUPPLIER SUPPLIER
STOCK
NUMBER
QTY
601 . CABLE,
4-CONDUCTOR
4 22-GAUGE,
7 x 30
STRAND TINNED
COPPER
CONDUCTORS,
PVC INSULATED,
PVC JACKET,
0.185" O.D.
BELDEN 8444 MOUSER
ELECTRONICS
566-8444-100
(ROLL OF 100')
A/R
602† P1 CONNECTOR,
4-CONDUCTOR
CABLE
9 POSITION,
MALE CONTACTS,
D-SUBMINIATURE
CINCH DEH-9P MOUSER
ELECTRONICS
538-DEH-9P A/R
603† P2 CONNECTOR,
4-CONDUCTOR
CABLE
9 POSITION,
FEMALE CONTACTS,
D-SUBMINIATURE
CINCH DEH-9S MOUSER
ELECTRONICS
538-DEH-9S 1
604 . MALE SCREW
LOCK WITH
"U" CLIP,
CONNECTOR
4-40,
0.250" L
TYCO/AMP 5205980-1 MOUSER
ELECTRONICS
571-5205980-1 2
605 . HOOD,
CONNECTOR
. TYCO/AMP 207467-1 MOUSER
ELECTRONICS
571-2074671 2
606 . CORD,
POWER
3 18-GAUGE,
41 x 34
STRAND
CONDUCTORS,
SVT JACKET,
10' L,
SHIELDED
DGS
PRO-AUDIO
173-0621-E MOUSER
ELECTRONICS
173-0621-E 1


Parts Table 7 ^
Fixture Items
LINE ITEM DESCRIPTION VALUE MANUFACTURER

MANUFACTURER PART
NUMBER

SUPPLIER SUPPLIER
STOCK
NUMBER
QTY
701 STANDOFF 6-32 x
2.5" L,
HEXAGONAL,
ALUMINUM
. KEYSTONE 1825 MOUSER
ELECTRONICS
534-1825 4
702 STANDOFF 6-32 x
2.0"L,
HEXAGONAL,
MALE/FEMALE,
ALUMINUM
. KEYSTONE 8425 MOUSER
ELECTRONICS
534-8425 4











Drawing Index
(back to contents)

126 Theremin

Antenna

Brackets

Base

Component Locations

Insulated Solder Turret Terminal

Theremin Mounting Plate Hole Locations

Parameter Responses

Power Supply Lay-out

Power Supply Mounting Plate Hole Locations

Schematic (page 1)

Schematic (page 2)

Schematic (page 3)

Transformers




Text and drawings ©2002, 2003, 2005, 2008, 2010, 2013 by Arthur Harrison

Contact Author

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