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RE: NYAL OTL 3

Posted by Banat on June 5, 2012 at 09:26:22:
If only one of upper bank three power tubes glows than check the value of G1 grid stop resistor on that glowing tube first , since that grid stop resistors is only non common element of upper power tubes bank negative bias network , but is separate for each power tube , check for bad solder points around that glowing tube socket to .
BTW , NYAL OTL 3 is not very complex electronic unit and some factory service manual which include voltage and current chart , adjusting points ,... etc , well be very helpful for quick service and quick malfunction diagnose .
Best Regards !