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Preamp Parts
( 36 Preamp Parts sorted by Price High to Low.)
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Apt Pre Preamp Board
# 73167
201-202 Series board, Board has had all capacitor updates, +7dB gain, Input impedance set at 20? but can be adjusted, Lower gain version for high output moving coil, Condition: 9.
$ 228
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Apt Holman Pre Amp Standard Face Panel
# 72401
Black Pebble finish, small cosmetic flaws, above volume scratched very minor, right of "bass" discoloration, all lettering intact, very good condition, Condition #9
$ 88
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Apt Holman Pre Amp 19" Rack Mount Face Plate
# 72404
Black with white lettering, black anodized, all lettering intact *except (L-R) "L" slightly rubbed and discoloration of black surface, this face panel can use previous screws standard to regular face, very good, still shows nicely, Condition #9+
$ 88
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Apt Holman Pre Amp 19" Rack Mount Face Panel
# 72405
Black with white lettering, black anodized, all lettering intact, very slight discoloration of surface below lower right side screw hole, looks very nice, excellent condition, Condition #9
$ 88
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Apt Holman Pre Amp 19 " Rack mount Face Panel
# 72402
Black with white lettering, black anodized, all lettering intact, very light, small scratch below center screw very light about 2" long, this face can use previous screws standard to regular face, very good condition, shows well, Condition #9-
$ 68
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If you are having trouble finding parts, enter the name into our search bar at the top of the page. Please be aware there is a minimum $4-$6 to ship any part. International orders will be $24-$26 to ship for anything larger than an envelope. Shipping costs are non negotiable, so please, PLEASE do not ask for a part, or for us to search for, or quantify a part if you cannot pay for the shipping.
APT Preamp Knob Kit
# 52516
Charcoal gray, 2 large, 4 small, screws, very good condition-like new, condition #9 *for in house use*
$ 60
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APT Holman
# 53132
Special kit of black, anodized knobs with a shiny finish. 4 small, 2 large. Unique, custom set for prototype audiophile version. For in house use, requires special fit onto shafts. Very sexy! Like new! Condition 9+
$ 56
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APT preamp back panel
# 47016
(1) Complete back panel assembly with 120vAC connector. Excellent #9 condition.
$ 55
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APT Preamp Knob Kit
# 61096
2 large, 2 small. Typical grey anodized knobs. Used but real nice. No obvious scratches. #8 condition.
$ 52
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APT preamp face plate
# 47015
Rack mount version, green and black color. No handles included with this piece, but some may be available here. Good #7 condition with three or four long scuff marks in middle, but acceptable for someone who needs a rack face.
$ 38
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Noble precision pots (PAIR)
# 52556
10k ohms X 2, detented control, #279Y10Kx2, 6 legs, 5/16" shaft length, 10 available, new, condition #9 (the listed price is for 2 controls)

FYI:
These are fine detent (click) controls. They may be more accurate than the program channel balance you are sending through them, actually. To improve "scaling" of the control, a 2. 2k to 4. 7k resistor could be put in front (series) with the control. This would probably allow that at the average listening level, the position of the control would be about halfway up.

But this level of audio really also depends on what signal preamp levels come before, and what amplifier gain or input impedance you have after the control. Such matters of level are usually more inaccurate here than with the control itself. In a Japanese preamp like a Nikko Beta 1 (uses same part), control tracking accuracy is within . 5 db channel to channel balance. But passive control designs often are inaccurate, subject to matters as mentioned above.

It seems ironic, but passive circuit audiophile designs actually are not as accurate or as quiet as the op amp buffer IC pre and post the control. These controls can be wired in as a true gain control also (not a simple level control) and now frequency bandwidth, impedance matching problems, etc are all solved. But a passive control is OK as long as you are not trying to output a tube preamp to a tube in amp whereby the impedance and signal load matching is now usually a mismatch. It can be a problem to get everything right. Here is a case where probably you must "pre load" the control with a 50k series resistor! Tube preamps by design need to see this minimum requirement "load," FYI.
$ 36
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Nobel dual control audio level (pair)
# 56307
10K ohm x 2; 6 pin; audiophile grade, with washer and nut. New old stock.
$ 30
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Phase Linear/Carver Preamp Handles
# 59011
(2) Handle available, Matte nickle finish on Aluminum handle, Screws included (need to be cut to proper length for face panel with bolt cutters) 3" center-center, used, good condition Condition #9 Price is for the pair
$ 28
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Noble
# 52567
Precision pots, #279Y10Kx2 8323, 10k ohms X 2, 8 legs, 5/16" shaft length, 6 available, new, condition #9
$ 28
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Re: International Shipping: We ship internationally often and have yet to encounter a problem or complaint. We are very careful to test the equipment before it’s packed and then to double box the machine with added protection when needed for front panels, etc. We are not amateurs or an ebay store; we know these machines very well and know what it takes to get them to you safely. We use USPS priority internationally which seems to be the cheapest. If you prefer another carrier (you should know who delivers to your area reliably) please let us know. Also please be aware of any tariffs that you may be responsible for upon pick up on your end. International shipping may be expensive but we will make sure it is not a headache on top of the cost. PLEASE NOTE THAT SHIPPING INTERNATIONALLY WILL BE A MINIMUM OF $24 EVEN FOR SMALL PARTS.
SAE AC power switch
# 54653
With black button cap. 2 sets of contacts, which can be doubled up and perform as new. salvaged, #9 condition.
$ 24
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Adcom GFP-1A
# 60988
Rackmount faceplate, lettering good but faceplate has lost black anodization and turned purple, no scratches, #7
$ 22
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Audio Research MJ413
# 48449
Special, high voltage regulator transistor. New old stock.
$ 22
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APT Preamp Faceplate
# 56243
Worn off lettering at volume & input label, very minor scuffs at edges, usable but obvious finger wear. Condition: 7
$ 20
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Apt Pre Amp Faceplate Gerard Grey
# 72783
Single Piece, Good condition, lightly worn, lightly scratched but no broken. #7 Condition
$ 20
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Apt Pre Amp Faceplate Gerard Grey
# 72781
Single Piece. In good condition with minor scuffs and wear. Corners lightly bent and scratched. #7+ Condition
$ 20
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Dynaco Preamp
# 58408
Substitute balance control for #1347005, 220K. Alps control is far better part. Click stop, high accuracy, low noise. Shaft must be cut down a little.
$ 18
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SAE model 1800, 2900, and others
# 54341
Power transformers. Creates +/-15 volts. Salvaged.
$ 18
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Apt Holman Preamp Top Cover
# 71501
Brown stain on cover, could be painted. Condition 8
$ 14
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APT 1 Amplifier Upgrades and Repairs Technical Information: Read more about it here.
APT Preamp Faceplates
# 63434
Pebble Black Finish, various available. One (1) in #9 Condition- $68. Six (6) more available in various conditions, all good with no major damage, approximate #8+ condition -$46.
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Phase Linear 2000 substitute 100k
# 62237
Control,non detente (click) , Version with slightly longer shaft 1/8" inch higher but easily can wire jumped into board($6). Same type of central lab look and feel, connect ranging for bass & treble, original control detente ($12). 9 condition, salvage test 01.
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SAE 1800
# 55443
SAE 1800 and other preamp parts, switches, faders, relay, RCA Connector - $8, Black buttons - $6. We can rebuild faders. Call for specifics.
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Ampex AM10 MX10 3-position switch
# 46544
Appears to be the same part for either AM10 or MX10. Three position switch with two sets of contacts.
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