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Synths built in the USSR tend to scare people away as they seem hard to repair and deemed to be full k56t1m2 exotic components. It’s hard to get information on these synths in English.

(PDF) K561TM2 Datasheet download

Electronically they are not the most reliable. It was fun to decode the IC’s though. Another issue was some bad solder dry joints. My particular synth was made in The EM is considered a string synthesizer but it has organ and brass.

In reality many are just Russian equivalents of western components, such as 40 logic IC’s. This turned out to be a bad diode KP I assume it’s the same as the ‘glide’ found. I have the transposer board out and I think it’s a faulty logic IC.


They are pretty fragile on this synth. They are in Russian but will at least datasheft some light on the internals.

Datasheet here and rough English translation here. It also has quite an aggressive filter which screams when over driven. These synths are l561tm2 well built and look really cool. In reality many are just Russian equivalents of western components, such as 40 logic IC’s The hassle can be working out what the alternatives are. On my synth this doesn’t work. It’s worth repairing this solder bridge between boards.

(Datasheet) KTM2 pdf – K,К,К, КТМ2 Тип микросхемы КТМ2 KTM2 (1-page)

A dry resistor solder joint was responsible for range upper 2′ not working. The bender range was way off, so adjusted with these two trimmers: On upper voice registers 2 and 4.

Thanks go to Karolis for confirming this. This can be down to a bad capacitor which sits under the corresponding key. Watch when de-soldering components that you don’t lift the PCB tracks. To be fair there are some nice features on this synth, One is the handy hinged keyboard assembly, that lifts for voice board access.


Update – I actually found out that these controls only affect pedal operation and were not faulty after all. This diode was replaced with a 1N and the upper 4′ voice issue was fixed.

I assume it’s the same as the ‘glide’ found on western synths. Built in military production plants in the former Soviet Union. It sounds the buisness with a small stone phaser. The synth is fully polyphonic, paraphonic really. Get yourself the schematics. One of the upper ‘B’ notes was stuck on. The EM has a ‘slide’ control with interval. Although my synth was ok, many EM’s have keys that do not release. Please email me with any corrections or pertinent information at: