Category: ARP

I briefly show you my set up to test ARP Voltage Controlled Filter submodules. We also have a listen to a couple of different ARP filter designs, the 4075 found in all ARPs from 1975 on, and the 4035 Moog style ladder filter found in some rarer Odysseys.

This Rhodes Chroma lay dormant for over a decade, and wouldn’t wake up from its long nap. In this video we troubleshoot and repair the power supply and get the synth alive and making sound. We also have a brief tour around the inside of this legendary polysynth.

Want to see more of the restoration and upgrade of this Chroma? Let me know what you’d like to see in the comments!

Introducing an innovative replacement for the obsolete and impossible to find ARP Octave Transpose switch found on the ARP Pro Soloist & Pro/DGX. Let me know in the comments what you think of this as a replacement! If there’s any interest, I will also make one for other ARP synths like the Odyssey and Axxe.

This particular Pro Soloist also has my replacement 4034 filter submodule installed, which sounds just like the original, only better!

Synthchaser LED Octave Transpose Switch for ARP Pro Soloist & Pro/DGX Synthesizers

Synthchaser ARP 4034 VCF Filter Submodule

 

We bring a dead ARP 16 Voice Electronic Piano Model 3303 back to life and get a quick sampling of the features and presets this electric piano has to offer.

If you’re looking to buy one of these, please contact me!

Finally our long and tedious restoration is complete, and I walk you through the features and sounds of the ARP Quadra.

0:28 Bass Section
3:37 String Section
5:55 Poly Synth Section
9:20 Lead Synth Section
18:27 Phase Shifter
21:31 ARP Quadra Sounds
24:18 Conclusion

I have ARP Quadras available, please contact me if you are interested in purchasing one.

After doing the general restoration work of the ARP Quadra, we fire it up and I show you the 3 most significant repairs it took to get it up and running.

Totally dead synth repaired at 2:07
Dead lower keys & electric bass all playing the same note repaired at 10:39
Dead lead synth oscillator repaired at 20:38

Today we refurbish the keybed of the ARP Quadra, test & replace the aftertouch sensor, and change out a few panel jacks before we fire it up and see if it works.

 

 

Continuing our restoration of the ARP Quadra, we tackle the two large analog boards and the CPU board–changing tons of IC chips and capacitors and refurbishing the sliders.

 

We made it to Episode 100! Hurray!

Forging ahead on the ARP Quadra restoration, I give you an overview of what the Quadra does and what’s inside of it, and we get started recapping and testing the power supply and several other boards.

 

It’s finally time for some ARP Quadra restoration videos! I’ve been sitting on some broken Quadras for a while and have finally found a good home for one of them. But, before I can commit to selling this Quadra and get underway restoring it, I need to know if the membrane panel works.

So in this video, I show you how to test out the membrane panel. Important to do if considering buying a broken Quadra, or if you have a Quadra with some bad switches.

Download reference sheet here:  ARP Quadra 15 Pin Membrane Panel Interface