Overhaul Studer B67
![](https://vintageaudiosweden.com/wp-content/uploads/2020/02/Studer_B67-731x1024.jpg)
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
![](https://vintageaudiosweden.com/wp-content/uploads/2020/02/electret_preamp_4-min-768x1024.jpg)
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
![](https://vintageaudiosweden.com/wp-content/uploads/2020/01/PolysixBjörn_9-min-1024x768.jpg)
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 […]