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Original Message
RE: NYAL OTL 3
Posted by 714rhino on June 8, 2012 at 02:48:12:
How much plate current are you drawing? Lift the positive leg of the bridge rectifier and insert a meter, if you are over 500ma dial it back to around 350, sounds like you are running them too hard and the ones that do not glow can withstand the high current and the glowing tubes cannot.
Buy a set of tubes from Roger Modjeski, (ram tubes) they are the best you can get.