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Original Message

RE: NYAL OTL 3

Posted by v_n_naidu@hotmail.com on June 5, 2012 at 04:30:13:

Thanks for your comments Banat. Only 1 of the top bank of tubes glows. If there is an issue with the trim pots, should it not also affact the other 2 tubes in the upper bank. Yes I would check the trim pots anyway.

As a last ditch measure I'm seriously considering converting the amp to the 3Q version with only 2 tubes in the upper and lower banks respectively. Would like to seek inputs from members on what other changes if any that need to be made to the circuit other than just removing 2 tubes. If I am not wrong, the photo in Mike Mounts post shows the OTL3 Q. Would Mike like to confirm and comment please. Comments from others using the 'Q' version would be appreciated
The few comments on the OTL3 Q that I have read, state that 1 tube in the upper and lower bank are removed and capacitors added to roll off the base at @100hz. The capacitors bit would not apply as I would not be using the amp to drive the Quadb

Rgds,
Nara