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Kurzweil

Kurzweil K2000RS

The display illumination tend to fade.
Kurzweil

Kurzweil PC3LE6

Logan

Logan String Melody II

Moog

Moog Little Phatty

Moog

Moog Micromoog

Moog

Moog the Rogue

The Rogue uses a unusual AC 24V (~250mA) adaper with a 3.5mm mono jack. 
Moog

Moog Theremini

Novation

Novation Superbass Station

Novation

Novation Supernova II Keyboard

Common problems:
-DAC
-Data encoders
-Push buttons (especialy voices selection)
-Rust is also frequent
Novation

Novation X-Station 25

Oberheim Matrix 6

Oberheim

Oberheim Matrix 1000

Oberheim

Oberheim OB-12

The Viscount made Oberheim will never be a real Oberheim for many.

Just like the Korg 01/W series, the back illumination of the display tend to fade with age.

Powertran Transcendent 2000

This small monophonic synth was presented on Electronics Today International magazine as the cover article in July 1978. It was designed by Tim Orr from EMS and was offered as a DIY kit for 186.50£ plus VAT. In December 1980, ETI presented a polyphonic synthesizer accordingly named Polysynth also designed by Tim Orr.

This was the first synthesizer for some musicians, notably Thomas Dolby who retrieved one from a garbage dumpster or Joy Division guitarist Bernard Sumner who bought and assembled one.

Powertran Transcendent Polysynth

Like its smaller brother Transcendent 2000, this synthesizer was the cover article of ETI magazine in December 1980 (covered in a total of 4 magazines) and was also designed by Tim Orr.
Quasimidi

Quasimidi The Raven

I have the Max extension installed. Actually, I have two units.
Roland

Roland Alpha Juno 2

Roland

Roland D-50

I have 4 of these...
Roland

Roland JP-8000

Roland

Roland Juno 106

Roland

Roland JV-1080


 

Roland

Roland JX-3P

Roland

Roland JX-8P

Common problems:
-Potentiometers
-Aftertouch

Roland MD-8

MIDI DCB Interface - used in Roland Juno 60 and Jupiter 8
Roland

Roland MKS-30