- May 2, 2021
- Rocky Mountains
Depending on how it sounds...
The GE datasheet says the *design center* is 250V on the plate. That is where you are running now. 265 - 18.8 = 246.2. Happy little tubes. ...but you are wanting more yummy sounds. Maybe a not so happy tube will get you there.
The TungSol datasheet *says* a Max of 275V. It would be near 300V (subtract cathode voltage) to be near 275V Max.
Idk which would sound better but a rule of thumb with SE amps is to run them at or over 100%MPD. The Plate voltage drops as the % goes up. I am concerned the voltage will drop below the *voltage sweet range* once the bias is in the *bias sweet range*. Idk this for sure with a 6AQ5. I am guessing.
To answer directly, I would consider as high as ~320B+ but for this application probably no more than ~300V B+, and that might be past the sweet range.
The secondary 200V winding will have thinner wire than the secondary 6.3V winding so there is no issue adding this extra length of wire to the 200V coil. Essentially this is what is done with a *bucking transformer*. Depending on which end of the coil is in series with the 200V secondary the voltage will *Buck* or *Boost* the ~6V. (It is only 6V so it is not a big deal but sometimes more is more,)
For safety, the windings should be on the same side of the PT. Iow, do not use a secondary winding to add/subtract from the primary winding.
Cool! More goosing to do...