6SN7 Valve input

[acorn]

Hi all


Can any one make any suggestions as to the best conditions for the 6SN7 as an input valve and phase splitter using CD input ie for the best response and least distortion, at the moment the first stage anode as a 47 K connected to a 290 volt rail and the phase splitter as a 27 K on its anode from the same rail,
any guide lines would be very welcome.

Regards Acorn

[Ardee]

For what it's worth, I'd vote for the Williamson arrangement or, if this has too much gain, a self biasing concertina splitter as used in the GEC 100W fixed bias design.

[James D]

Quick answer, run then at much higher current than the above values would give. Aim for 7-10mA through each section...

James

[acorn]

Hi James

Thanks for the advice, one point though, if you used the first triode ie G1 A1 K1 as the second triode and used it as the phase splitter would this have any determental effect on the overhall ferquency response. I am not quite sure if this should make a differance.


Regards Acorn