Moog / Realistic MG-1

 I love these little Radioshack Moogs! I have a MG-1 of my own that I overhauled and heavily modded a while ago, and I’m always happy to bring another into the shop. They are so simple and there are only a couple parts that are hard to find– the sliders, the switches, and the MM5823 frequency divider ICs. This MG-1 was not in too bad shape, and the foam under the panel had mostly been removed already, but had one of the three divider ICs not working.
Service Tips
If you have several octaves of a handful of notes not playing, the MM5823 frequency divider ICs are the culprit.  I found a clever replacement solution from Flatkeys, a company in the UK— a little SMD board that fits right into the place where the original 14-pin DIP IC went.
There was also a slider with a broken wiper, but I couldn’t find any sliders of that type with the right value (10K) anywhere on the internet, so I bought a 2M one from Syntaur, took both apart and swapped out the resistive strips– as I was doing it, I was telling myself, “I am doing a ridiculous thing,” but it worked.
Work done: replaced all electrolytic capacitors, cleaned switches, cleaned and lubricated sliders, replaced MM5823 IC, replaced one bad slider, added 1/4″ output jack

ARP Omni 2

Tantalum Capacitors in the Arp Omni 2
Tantalum Capacitors in the Arp Omni 2

This one belongs to Jeff Zeigler, a great musician who also runs the studio Uniform Recording. The ARP Omni 2 is a synth where a lot can go wrong, but it has a very, very repetitive internal architecture so it’s often the same problems over and over– bad logic ICs and bad tantalum capacitors (blue circles in photo above).  That doesn’t mean it’s easy to fix though!

Continue reading “ARP Omni 2”

Welcome to the Bell Tone blog!


Hi friends… So after 7 years of working on synths, I’m transitioning to doing this full time and I’ve decided to start blogging about my repairs in the hope that some of my advice might help other people on their synth repair projects! I always take notes on my repairs, so I figured I might as well flesh them out a bit more and share them here.

My focus will be on sharing less-than-obvious practical advice pertaining to the idiosyncrasies of certain synths (desoldering temperatures, part substitutions, where to get specific parts, etc) that I figured out through trial-and-error, so that maybe I can help someone else avoid the “error” part of the process. The internet has been a great resource for me throughout my time spent working on electronics, and I’d like to give back by helping out the next person who does a google search for “help arp omni traces ripping off help help help nooooo whyyyyy.”

Of course– I’m running a business so I’m also trying to connect with clients, so I’d be remiss not to say here now— if you have any analog or vintage synths, combo organs or Rhodes/Wurlitzer pianos in need of a little help, please get in touch!