Galactron Amplifier Repairs

Galactron MK10 Stereo Integrated Amplifier

Galactron MK10 Stereo Integrated Amplifier Galactron MK10 Stereo Integrated Amplifier Galactron MK10 Stereo Integrated Amplifier Galactron MK10 Stereo Integrated Amplifier

This worked but needed looking at, first off the boards for the inputs didn't give any indication of what they were for! Turned out there was an RIAA EQ board a 2X LINE INPUT BOARD and three I have no idea what for input boards! Looking at the PSU, the main capacitors three per side +\- 2000µF 50V, were ok, but a look at the circuit diagram told me the supply was 42V each side, which on the surface seemed ok. Measuring the actual voltage showed there was 60V per side, oops..
The Zeners in the regulated +\-15V supply needed replacing, they had lost the ability to be a "Zener", as this was from around 1973 most of the capacitors were duff.