"Nick Gorham" wrote in message
...
Iain M Churches wrote:



I think the Reznekov amp was 211. Jim asked me about the power level.
I could only say "low" What can a 211 deliver, and and what kind of THD
levels?


Depends, but I would expect something like 15-20W from a 211, depends on
the B+, to get the most from them (unlike a 845) they need driving A2,
which adds it own problems. I would think 1-2% at 15W would be the sort of
output you would expect, almost entirly 2nd harmonic. But with much lower
distortion at lower output. Depends on the design as always. Maybe its a
Ongaku type circuit.


Hmm. That's interesting. I think that the front end is two
halves of a 6SN7. It is difficult to say, but I think we were
listening at perhaps only 3-5W.
There was no audibler distortion (or at least none that
I could detect:-) at this level.

211's are very dependednt on transformer quality, the high Ra, means that
you can have HF problems if its not a well made (expensive) transformer.

I listened carefully to the 1st violin. It was perfectly clean. The
limited lower range of the cello did not give me a chance to
evaluate the LF performace of the amplifier. The transformer was,
I assume, Russian made.

Thanks for the info.

Iain