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Wojtek wrote:

In my old email to you I've mentioned that I have a pair of monster transformers 310-0-310 2A .I'd like to use them as a main transformer for bi-tri amp configuration ,with input choke load and folowing separating (tree branches) chokes for each amp .Duncan amps predict my B+ as 270-280V.Will this higher B+ degrade the sound noticably?

You will be burning the tubes at higher dissipating power, is it necessary? Sonically, I would keep the output stage at 200V-220V. HF and MF channels do not need more and if you go higher then it sound not good. The LF do not need voltage in most of the case and the dimpling would depends of your speakers, transformers and plate current. If you wish you might go for 250V at LF channel but you would need an extra secondary coil or a transformer as do so as you do not want to introduce any dropping resistor into the plate supple and rising the supply impedance.

Wojtek wrote:

Also did you custom order transformers for driver (bias) stage or it's a Hammond unit?

No I did not, however if you have 3 channel and drive them form one input choke than 100mA is already a more or less respectable current. Look for those stray fields…. And partially among other pieces of magnetic.

Wojtek wrote:

Last thing;coupling caps . I'm out of luck finding 4uF (or any) electrocubes so what else will fit the bill?

Use 2uF, 950 series.

The Cat

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