Overhaul Studer B67​

I recently acquired a Studer B67 master tape recorder. It’s a 1/4 inch 2 track machine which has been in use at Sveriges Radio a long time ago en ever since been stashed away. It’s currently being overhauled en brought back into it’s former glory. The electronics are nice and clean and the wear of […]

Korg Polysix​ with unwanted pitch modulation

This Korg Polysix synthesizer was sent to me and behaved strange; all the oscillators pitch appeared to have an unwanted modulation and it appeared more clearly with the higher notes. All the patches had the same problem. As a first step I checked out the voltages for deviations and ripple. I wasn’t convinced of what […]