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Electronically they are not the most reliable.

Built in military production plants in the former Soviet Union. My particular satasheet was made in The EM is considered a string synthesizer but it has organ and brass. It also has quite an aggressive filter which screams when over driven. It sounds the buisness with a small stone phaser.

KTM2 Datasheet, PDF – Datasheet Search Engine

The synth is fully polyphonic, paraphonic really. Synths built in the USSR tend to scare people away as datashwet seem hard to repair and deemed to be full of exotic components. In reality many are just Russian equivalents of western components, such as 40 logic IC’s. To be fair there are some nice features on this synth, One is the handy hinged keyboard assembly, that lifts for voice board access. It’s hard to get information on these synths in English.


Please email me with any corrections or pertinent information at: Watch when de-soldering components that you don’t lift the PCB tracks. They are pretty fragile on this synth. Get yourself the schematics.

They are in Russian but will at least throw some light on the internals. This turned out to be a bad diode KP Although my synth was ok, many EM’s have keys that do not release. This can be down to a bad dafasheet which sits under the corresponding key. Another issue was some bad solder dry joints. A dry resistor solder joint was responsible for range upper 2′ not working.

KTM2 datasheet & applicatoin notes – Datasheet Archive

The EM has a ‘slide’ control with interval. On my synth this doesn’t work. I assume it’s the same as the ‘glide’ found. Update – I actually found out that these controls only affect pedal operation and were not faulty after all.

It was fun to decode the IC’s though. Thanks go to Karolis for confirming this.


Datasheet here and rough English translation here. These synths are very 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. One of the upper ‘B’ notes was stuck on. On upper voice registers 2 and 4.

K561TM2 Datasheet PDF – ETC

This diode was replaced with a 1N and the upper 4′ voice issue was fixed. The bender range was way off, so adjusted with these daatasheet trimmers: I assume it’s the same as the ‘glide’ found on western synths. I have the transposer board out and I think it’s a faulty logic IC. It’s worth repairing this solder bridge between boards.