Arp Quadra
Released in 1978It'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.

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.

$1.95 (Part #5166)

$0.95 (Part #3788)

$2.95 (Part #3685)

$7.95 (Part #3975)

$2.95 (Part #3304)

$2.95 (Part #3738)

$2.95 (Part #3391)

$2.95 (Part #1783)

$2.95 (Part #3302)

$2.95 (Part #10696)

$2.95 (Part #3411)

$2.95 (Part #4319)

$2.95 (Part #7739)

$2.95 (Part #3413)

$2.95 (Part #3994)

$2.95 (Part #2696)

$2.95 (Part #3387)

$3.95 (Part #3428)

$2.95 (Part #3147)

$3.95 (Part #5171)

$14.95 (Part #5183)

$7.95 (Part #7373)

$4.95 (Part #3300)

$2.95 (Part #2733)

$46.95 (Part #3321)

$4.95 (Part #2653)

$2.95 (Part #4260)

$2.95 (Part #3423)

$5.95 (Part #3182)

For Quadra with K34U keys
$4.95 (Part #PRKBB)

For Quadra with K34U keys
$4.95 (Part #PRKB)

$0.74 (Part #4169)

$35.95 (Part #416961)

$59.95 (Part #4169B)

For early Quadra white keys, later Quadra black keys
$3.95 (Part #KEYSPM)

For K34U black keys
$2.95 (Part #KYSP16)

For K17U white keys
$2.95 (Part #KYSP17)

$159.95 (Part #5760)

$7.95 (Part #PC)

$3.95 (Part #3923)

$9.95 (Part #3011)

For Mixer section
$29.95 (Part #4747)

Not for Mixer section
$22.95 (Part #4762)

$9.95 (Part #3741)

$9.95 (Part #3744)

$9.95 (Part #3739)

$9.95 (Part #3742)

For later Quadra
$13.95 (Part #K17UBL)

For later Quadra
$17.95 (Part #K17UA)

For later Quadra
$17.95 (Part #K17UB)

For later Quadra
$17.95 (Part #K17UC)

For later Quadra
$17.95 (Part #K17UD)

For later Quadra
$17.95 (Part #K17UE)

For later Quadra
$17.95 (Part #K17UF)

For later Quadra
$17.95 (Part #K17UG)

For later Quadra
$24.95 (Part #K17UC8)

For early models
$10.95 (Part #K34UBL)

For early Quadra
$12.95 (Part #K34UA)

For early Quadra
$12.95 (Part #K34UB)

For early Quadra
$12.95 (Part #K34UC)

For early Quadra
$12.95 (Part #K34UD)

For early Quadra
$12.95 (Part #K34UE)

for early Quadra
$12.95 (Part #K34UF)

for early Quadra
$12.95 (Part #K34UG)

For early Quadra
$17.95 (Part #K34UC8)

$1.95 (Part #5176)

$1.95 (Part #6032)

$2.95 (Part #7444)

$3.95 (Part #5095)

$3.95 (Part #1508)

$2.95 (Part #5161)

$2.95 (Part #5135)

$2.95 (Part #5134)

$2.95 (Part #2256)