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.

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.

You can get 40W ish out of a GM70 SET though, so its not all small stuff.

I have a fellow "nutter" getting 75W out of a 212 SET at the moment...

You can increase power output by paralleling the valves, but IMHO that
produces problems with the resultant sound.

--
Nick