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ARP/Solina String Ensemble Power Supply Rebuild video

In this video I have a String Ensemble in for repair.  The first step is to rebuild the power supply, which is actually spread over 5 different PCBs in the synthesizer!  In this video I show you around inside the String Ensemble, explain how the power supply works, what you need to do to rebuild […]

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Synthchaser Precision LED Slider Kits for ARP Omni 1, Omni 2, Pro Soloist, Pro/DGX

We are pleased to offer LED slider retrofit kits for ARP Synthesizers.  We currently offer kits for the Omni 1, Omni 2, Pro Soloist, and Pro/DGX. These kits are user installable by anyone with reasonable soldering skills.  Even when they were new, the original CTS sliders just weren’t very good.  Compound that with 40+ years […]

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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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