• 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.

6sl7 6sl7 dynaco driver board

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Alastair E

Alastair E

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Joined 2004
doctordiesel.co.uk
By the look of it--I may be getting it wrong though....

Youve only got 50-60V across the Plate to Cathode of phase-splitter?

For a 330V plate SUPPLY to phase-splitter, you should have around 110V across the TUBE...

So, you need to Feed the Grid of phase-splitter with around 110V from previous stage, if you are DC coupling--currently this is higher?

Alternatively, you could self-bias this stage....

you May need also to reduce the value of the resistors on plate/cathode to around 15-18K too, to get the 1/3 voltage division ....
 
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