tube box I service manual

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pro-ject tube box Post #1
Hi guys,

i have a tube box first version with a problem.
I track a huge distortion a the output.
I am testing it with a sine wave of 10mV pk-pk.

I was wondering if anybody can point out a service manual/ schematic for this phono stage.
I have never fixed a valves circuit and therefore i am a little bit concerned.

Any hints is of course welcome.


Thank you very much for the attention.


Best,
Stefano.
 
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