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yes, your are right

There isn't enough info to make any suggestion.

It is 6sl7 // dc to 2a3. The setting is pretty what the book suggestded, 250vdc plate voltage, bias -45 +/- 2v, the plate current is around 55-60ma, depends on the condition of the tube. B+ is 425 +/- 3, plate ref to ground is 420v, filament ref to ground is around 170vdc.

I guess I am within the parameter except making one careless mistake. Wrong filament voltage!!



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