I have been given a set of Transformers from a 1965 Sansui 1000a. I'm attempting to put them to use in a 40ish watt 6L6 amp. It has a 32 v tap (unloaded) which I fear will be too low for 2 6L6s. Sansui used that tap to get -19 volts for a quad of 7591s. I made up a doubler that gives me around -80v which is too high. The bias pot bottoms out at -48v. My question is...Should I use a dropping resistor after filter which feeds the bias pot or before the doubler...or something else?
I put a 9k1 resistor in series just before the bias pot and got -24v to -68v unloaded. I've never tried this implementation before and was wondering if there are any pitfalls before I build the rest of the circuit?
Lowering Negative bias voltage
Moderators: pompeiisneaks, Colossal
Lowering Negative bias voltage
If it don't get hot and glow, I don't want it !
Re: Lowering Negative bias voltage
Do it, it’s ok but take care of the maximum current of the tap.
And reduce the range of the bias by one order of magnitude.
PS
when talking about negative values, lowering a value means increasing its module and so male it even more negative. This is for your next posts.
And reduce the range of the bias by one order of magnitude.
PS
when talking about negative values, lowering a value means increasing its module and so male it even more negative. This is for your next posts.