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ARP Synthesizers

ARP Pro Soloist & Pro/DGX ROMs available

The ARP Pro Soloist introduced in 1972 and continued through 1981 as the Pro/DGX featured selectable presets, which used 8 archaic ROM chips to control the routing of the signal path (filter resonance, vibrato, ADSR parameters, etc).  The ROM chip used was an Intersil IM5600, a 256 bit (!!) ROM that is long obsolete, and […]

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ARP tantalum capacitors

This one didn’t go up in a blaze of glory, but the potential was there…  The tantalum capacitors in vintage ARP synthesizers were of questionable quality when they were new, and now are disasters waiting to happen.  Good quality tantalum capacitors are a fire hazard when exposed to even brief voltages that barely exceed their […]

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ARP String Ensemble Power Supply rebuild

The ARP String Ensemble we have in stock rolled off the factory line in 1974.  Everything inside was original, including the power supply capacitors.  The ARP/Solina String Ensemble uses an unregulated power supply, with the varying voltages being generated by rudimentary resistor voltage dividers.  The filter capacitors in the original synth were 25V capacitors, on […]

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2 ARP Quadras awaiting restoration

We recently acquired 2 ARP Quadras in nice physical condition, but sadly not working properly. Quadra #1 powers up, but only the bass section works.  The membrane panel isn’t responsive.  ARP membrane panel issues are said to have contributed to the company’s failure…  However, if all the membrane buttons aren’t working, I’d have to suspect […]

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