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RE: NYAL OTL 3

Hi !

Remove and check all trim pot`s with ohm meter , one by one , but without turning trim pot sliders .
I`m suspect that Amp upper bank of power tubes which plates glow orange have no correct G1/G2 bias beacose of bad bias trim pot .
Sign of incorrect power tube bias is that you don`t have exactly 1/2 of V1,2,3 B+ plate voltage on the lower bank of power tubes plates .
For example :
If you measure +300V on the upper power tube plates (V1,2,3) terminals than you have to measure exactly +150 V on the lower power tube plates terminals .

Best Regards !



Edits: 05/23/12 05/23/12

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