• 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.

Different brand valves

It might not be an imbalance anyway, as Mullard was part of Phillips so their valves were made in each others factories. You can buy Mullards made in Holland, or Philips made in England, or Valvo (Germany) made in France etc. Some 'Mullards' were made in India or Japan.

If you are concerned about manufacture then you should ignore the brand printed on the outside and look at the works on the inside, and the etch code. Even then you may, or may not, want to have matched valves. Matched does not mean same factory code but same characteristics - some ebay sellers get this wrong (through greed or ignorance, not sure).
 

wdcw

Member
2010-07-21 11:21 pm
Wavebourn, Yes I took note of what you said in the other thread.

Would using an output transformer with a larger core--more Iron--Steel to stop saturation help this issue if I wanted to use differing valves for harmonic reasons.

Or are there other issues besides saturating the OPT to look out for.

What percentage of disbalance can we have in the OPT without causing problems. Or is there a way to compensate for this so we can have a disbalance for more harmonic content.

Cheers
 

wdcw

Member
2010-07-21 11:21 pm
Thanks Wavebourn,

I see what your saying.

I am a Luthier of 30yrs & want to try a few things regarding tube amps & harmonic content, a lot of the amps fall short in the way of harmonics without a truck load of electronic gadjets to make them sound good.

I think it's worth trying a few things.

Cheers