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Products for Arp
Quadra
Replacement Keys - Parts
For specs and technical info on this keyboard, see SynthArk.org.
Keyboard Service Center


Replacement Keys
These plastic keys will replace broken ones on your keyboard. Most of these replacement keys are used, but in fine condition; some are new. There are several different types of keys used on the Arp keyboards, so you will need to make sure you order the correct style. With the exception of the Top C note, all keys from octave to octave are identical, and all black keys are identical. In other words, a B note in the lowest octave uses the same key as a B note in any other octave. But the highest C note is different from the other C notes (see illustration below).

If you do not know the note names, on the 61-note keyboard shown below, the white keys from the bottom (left side) up are: C, D, E, F, G, A, B, and then the sequence repeats.

Arp Synth Notes

Click below to view keys for:
Quadra (early)   Quadra (later)


Parts
We stock both new and used parts; the individual item descriptions will specify whether a part is NEW or USED. All used electronic parts are tested and guaranteed working. This listing reflects our current inventory and is updated daily, so if a part is shown with a "Buy" button, we should have it in stock.

If a part is shown as Out of Stock, then we do not have it, and in most cases, we don't know when or even if we might have it again. Your best bet is to simply check back on our site occasionally. If a part is not listed on our site, then we do not carry that part. We can no longer research or special order parts that are not listed here, and we just don't have time to answer questions about parts that we don't carry.

We want to help you get the parts you need, but please do not ask us to help diagnose problems with your equipment. We simply don't have the resources to do this, and it is just not practical to diagnose repair issues without being able to test the equipment in person.


Quadra
Diode Diode, 1N34A (Part #5166)
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Diode Diode, 1N4148 (Part #3788)
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Integrated Circuit IC, 1458 dual op amp (Part #3685)
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Integrated Circuit IC, 3086 transistor array (Part #3975)
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Integrated Circuit IC, 4001 quad gate (Part #3304)
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Integrated Circuit IC, 4007 dual FET/inverter (Part #3738)
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Integrated Circuit IC, 4011 quad gate (Part #3391)
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Integrated Circuit IC, 4012 dual-input NAND gate (Part #1783)
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Integrated Circuit IC, 4016 quad analog switch (Part #3302)
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Integrated Circuit IC, 4046 phase locked loop (Part #3411)
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Integrated Circuit IC, 4051 multiplexer (Part #4319)
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Integrated Circuit IC, 4053 multiplexer switch (Part #3413)
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Integrated Circuit IC, 4069 hex inverter (Part #3994)
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Integrated Circuit IC, 4520 dual binary up counter (Part #2696)
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Integrated Circuit IC, 723C linear regulator (Part #3428)
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Integrated Circuit IC, 74LS04 hex inverter (Part #3147)
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Integrated Circuit IC, 74LS26 quad NAND gate (Part #5171)
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Integrated Circuit IC, 7523JN 8-bit D/A converter (Part #5183)
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Integrated Circuit IC, 8243 input/output expander (Part #7373)
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Integrated Circuit IC, LM301 op amp (Part #3300)
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Integrated Circuit IC, LM339 quad comparator (Part #2733)
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Integrated Circuit IC, MK50240N top octave synthesizer chip (Part #3321)
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Integrated Circuit IC, TL081 op amp (Part #4260)
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Arp J-wire guide J-wire guide (Part #3182)
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Arp Key Bracket Key bracket, white key, for early Quadra with Style 34U keys (Part #PRKB)
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Arp Key Bracket Key bracket, black key, for early Quadra with Style 34U keys (Part #PRKBB)
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Arp Key Bushing Key bushing (Part #4169)
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Arp Key Bushing Kit Key bushing kit (Part #416961)
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Arp Key Return Spring Key return spring, white key, for early Quadra with Style 34U keys (Part #KEYSPM)
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Arp Key Return Spring Key return spring, black key, for early Quadra with Style 34U keys (Part #KYSP16)
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Arp Key Return Spring Key return spring, white key, for later Quadra with Style 17U keys (Part #KYSP17)
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Arp Key Return Spring Key return spring, black key, for later Quadra with Style 17U keys (Part #KEYSPM)
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Arp Quadra Phaser Board Phaser board (Part #5760)
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Arp Quadra Power Cord Power cord (Part #PC)
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Screws Screws, for early Quadra keytops, pkg of 10 (Part #3923)
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Arp Slider Potentiometer Slide potentiometer, 100KB (not for Mixer section) (Part #4762)
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Arp Slide Potentiometer Slide potentiometer, 100KB, for Mixer section (Part #4747)
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Arp Slider Knob Slider knob, blue indicator (Part #3741)
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Arp Slider Knob Slider knob, green indicator (Part #3744)
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Arp Slider Knob Slider knob, red indicator (Part #3739)
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Arp Slider Knob Slider knob, white indicator (Part #3742)
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Transistor Transistor, 2N3904 (Part #5176)
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Transistor Transistor, 2N3906 (Part #6032)
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Trim Potentiometer Trim potentiometer, 100 ohm (Part #5095)
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Trim Potentiometer Trim potentiometer, 1KB (Part #5161)
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Trim Potentiometer Trim potentiometer, 25KB (Part #5134)
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Trim Potentiometer Trim potentiometer, 100KB (Part #1508)
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Trim Potentiometer Trim potentiometer, 250KB (Part #5135)
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Voltage Regulator Voltage regulator, 7805 (Part #2256)
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