Arp Quadra

Released in 1978

It's called a Quadra, because Arp's monster synth has four independent sections: Bass, Poly synth, Lead synth, and Strings. Add in an arpeggiator and a sweet phase shifter, and you have a instrument that is one of the most collectible vintage synthesizers.

There were two different styles of keys used in the Quadras over the years - early models used the K34U keys, which mount onto metal brackets, and later models used all-plastic K17U keys.

Synth
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We stock both NEW and USED parts; all used electronic parts are tested and guaranteed working.

This listing reflects our current inventory and is updated in real time. If a part is shown as Out of Stock, we typically don't know when or if we might have it again - but click on the part for more info, and then you will be able to sign up for an alert when we do have it available again. By including out of stock parts in our listings, we hope to offer customers a more complete and useful resource.

We cannot diagnose repair issues by phone or email. For technical questions, we suggest posting on our Forums, where our techs - as well as other users - can offer help.

Diode, 1N34A
Diode, 1N34A
$1.95 (Part #5166)
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Diode, 1N4148
Diode, 1N4148
$0.95 (Part #3788)
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IC, 1458 op amp
IC, 1458 op amp
$2.95 (Part #3685)
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IC, 3086 transistor array
IC, 3086 transistor array
$7.95 (Part #3975)
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IC, 4001 quad NOR gate
IC, 4001 quad NOR gate
$2.95 (Part #3304)
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IC, 4007 dual FET/inverter
IC, 4007 dual FET/inverter
$2.95 (Part #3738)
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IC, 4011 quad gate
IC, 4011 quad gate
$2.95 (Part #3391)
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IC, 4012 dual 4-input NAND gate
IC, 4012 dual 4-input NAND gate
$2.95 (Part #1783)
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IC, 4016 quad analog switch
IC, 4016 quad analog switch
$2.95 (Part #3302)
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IC, 4023, NAND gate
IC, 4023, NAND gate
$2.95 (Part #10696)
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IC, 4046 phase locked loop
IC, 4046 phase locked loop
$2.95 (Part #3411)
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IC, 4051 multiplexer chip
IC, 4051 multiplexer chip
$2.95 (Part #4319)
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IC, 4052 multiplexer switch
IC, 4052 multiplexer switch
$2.95 (Part #7739)
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IC, 4053 multiplexer switch
IC, 4053 multiplexer switch
$2.95 (Part #3413)
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IC, 4069 hex inverter
IC, 4069 hex inverter
$2.95 (Part #3994)
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IC, 4520 dual binary up counter
IC, 4520 dual binary up counter
$2.95 (Part #2696)
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IC, 4558 dual op amp
IC, 4558 dual op amp
$2.95 (Part #3387)
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IC, 723 linear regulator
IC, 723 linear regulator
$3.95 (Part #3428)
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IC, 74LS04 hex inverter
IC, 74LS04 hex inverter
$2.95 (Part #3147)
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IC, 74LS26 quad NAND gate
IC, 74LS26 quad NAND gate
$3.95 (Part #5171)
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IC, 7523JN 8-bit D/A converter
IC, 7523JN 8-bit D/A converter
$9.95 (Part #5183)
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IC, D8243 input/output expander
IC, D8243 input/output expander
$7.95 (Part #7373)
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IC, LM301 op amp
IC, LM301 op amp
$4.95 (Part #3300)
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IC, LM339N quad comparator
IC, LM339N quad comparator
$2.95 (Part #2733)
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IC, MK50240N top octave synthesizer chip
IC, MK50240N top octave synthesizer chip
$42.95 (Part #3321)
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IC, NTE834/CA339/LM339 quad comparator
IC, NTE834/CA339/LM339 quad comparator
$4.95 (Part #2653)
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IC, TL081 op amp
IC, TL081 op amp
$2.95 (Part #4260)
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IC, TL082 op amp
IC, TL082 op amp
$2.95 (Part #3423)
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J-wire guide
J-wire guide
$5.95 (Part #3182)
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Key bracket, black key
Key bracket, black key
For Quadra with K34U keys
$4.95 (Part #PRKBB)
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Key bracket, white key
Key bracket, white key
For Quadra with K34U keys
$4.95 (Part #PRKB)
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Key bushing
Key bushing
$0.70 (Part #4169)
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Key bushing kit, 61-note
Key bushing kit, 61-note
$32.95 (Part #416961)
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Key return spring
Key return spring
For early Quadra white keys, later Quadra black keys
$3.95 (Part #KEYSPM)
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Key return spring
Key return spring
For K34U black keys
$2.95 (Part #KYSP16)
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Key return spring
Key return spring
For K17U white keys
$2.95 (Part #KYSP17)
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Phaser board, Arp Quadra
Phaser board, Arp Quadra
$119.95 (Part #5760)
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Power cord
Power cord
$7.95 (Part #PC)
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Screws, for keytops, pkg of 10
Screws, for keytops, pkg of 10
$3.95 (Part #3923)
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Slide potentiometer shaft
Slide potentiometer shaft
$9.95 (Part #3011)
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Slide potentiometer, 100KB
Slide potentiometer, 100KB
For Mixer section
$29.95 (Part #4747)
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Slide potentiometer, 100KB
Slide potentiometer, 100KB
Not for Mixer section
$22.95 (Part #4762)
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Slider knob, blue indicator, Arp
Slider knob, blue indicator, Arp
$8.95 (Part #3741)
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Slider knob, green indicator, Arp
Slider knob, green indicator, Arp
$8.95 (Part #3744)
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Slider knob, red indicator, Arp
Slider knob, red indicator, Arp
$8.95 (Part #3739)
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Slider knob, white indicator, Arp
Slider knob, white indicator, Arp
$8.95 (Part #3742)
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Style 17U key, black note
For later Quadra
$13.95 (Part #K17UBL)
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Style 17U key, note A
For later Quadra
$17.95 (Part #K17UA)
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Style 17U key, note B
For later Quadra
$17.95 (Part #K17UB)
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Style 17U key, note C
For later Quadra
$17.95 (Part #K17UC)
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Style 17U key, note D
For later Quadra
$17.95 (Part #K17UD)
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Style 17U key, note E
For later Quadra
$17.95 (Part #K17UE)
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Style 17U key, note F
For later Quadra
$17.95 (Part #K17UF)
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Style 17U key, note G
For later Quadra
$17.95 (Part #K17UG)
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Style 17U key, top C note
For later Quadra
$24.95 (Part #K17UC8)
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Style 34U key, black note
For early models
$10.95 (Part #K34UBL)
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Style 34U key, note A
Style 34U key, note A
For early Quadra
$12.95 (Part #K34UA)
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Style 34U key, note B
For early Quadra
$12.95 (Part #K34UB)
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Style 34U key, note C
For early Quadra
$12.95 (Part #K34UC)
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Style 34U key, note D
For early Quadra
$12.95 (Part #K34UD)
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Style 34U key, note E
For early Quadra
$12.95 (Part #K34UE)
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Style 34U key, note F
for early Quadra
$12.95 (Part #K34UF)
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Style 34U key, note G
for early Quadra
$12.95 (Part #K34UG)
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Style 34U key, top C note
For early Quadra
$17.95 (Part #K34UC8)
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Transistor, 2N3904
Transistor, 2N3904
$1.95 (Part #5176)
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Transistor, 2N3906
Transistor, 2N3906
$1.95 (Part #6032)
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Transistor, TIP110
Transistor, TIP110
$2.95 (Part #7444)
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Trim potentiometer, 100 ohms
Trim potentiometer, 100 ohms
$2.95 (Part #5095)
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Trim potentiometer, 100KB
Trim potentiometer, 100KB
$3.95 (Part #1508)
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Trim potentiometer, 1K
Trim potentiometer, 1K
$2.95 (Part #5161)
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Trim potentiometer, 250KB
Trim potentiometer, 250KB
$2.95 (Part #5135)
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Trim potentiometer, 25K
Trim potentiometer, 25K
$2.95 (Part #5134)
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Voltage regulator, 7805
Voltage regulator, 7805
$2.95 (Part #2256)
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