[Heathkit] Testing 6BN8 tubes on a TT-1A

[Precision Carburetor]

I just got a chance to test some used 6BN8 tubes on my TT-1A and the GM was
quite high.  Much higher than the listed value.  If you have not done so
already try the same tubes with the filament at 6.3V.

73.

Jerry
W2JI