HEATHKIT
Vintage HEATHKIT Model W 5M Tube Power AmplifierThe Amp works fine. No hum.
All the functions work fine.
I tested all the tubes with TV7/BU Tube tester.
2x 12AU7 (RCA -USA)
Minimum: 56
Tube#1 : Triode#1:110 Triode#2:110 Tube#2 :Triode#1: 94 Triode#2: 96
4x 6L6GB(GE -USA) Minimum; 25
Tube#1 : 40 Tube#2 : 381x 5R4G (RCA-USA)
Minimum: 40 Plate#1: 54 Plate#2: 56