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 […]
Pre-amp Design for Stereo Electret Microphone
A friend asked if I could design a pre-amplifier for his stereo electret microphone which he wants to use for his saxophone.
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 […]