• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Schematic needed for circa 1985 tube preamp kit

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Hello,

I have a hand bulit tube preamp with phono stage in need of repair. My tech Mike Z. needs a schematic to fix it. I have taken pictures and will post with.

This was a DIY kit from Glass Audio circa 1085. Possibly Borberly design.

The circuit board says Old Colony Sound Labs 1985

Any help would be appreciated! You can email directly to [email protected]

Thank you for any leads on this. Kirk

View attachment preamp.zip IMG_4592[1].JPG IMG_4593[1].JPG IMG_4594[1].JPG IMG_4595[1].JPG IMG_4596[1].JPG
 
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