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RE: NYAL OTL 3

Posted by v_n_naidu@hotmail.com on June 6, 2012 at 01:17:04:
Thanks for your comments Banat,
Checked all the resistors when I received the amps and they were all within specs. The problem is not with a particular tube position in the upper bank.
Only 2 of the original tubes in the upper bank do not glow in any position in the upper bank. One tube in the upper bank glows in all the 3 positions in the upper bank. Also all the 3 tubes from the lower bank glow in all the 3 positions in the upper bank. All the six tubes do not glow in the lower bank.
Also all the 10 tubes that were purchased subsequently glow in all the 3 positions in the upper bank. Frankly I'm puzzled. If the problem is with a particular tube position in the upper bank,then it would be easier to find a solution.
This is the reason why I am considering using the amp with 2 tubes in each bank if this does not require any change to the circuit.

Rgds,
Nara