Struggling to get the B+ down for a long time with my little Fender Tweed #Champ clone, I finally found a culprit and a solution. In this video I test NOS Tube Amp Doctor 5Y3GT versus old tubes from Haltron, General Electric, RCA and Adzam. I was able to bring the voltage down from 410Vdc to 370Vdc by simply swapping out rectifiers. As an additional test, I swapped out different 6V6s to see their effect on the B+
00:00 intro
02:05 Tube Amp Doctor 5Y3 GT
03:00 testing bias at max volume
04:00 sound test at 11.66W
06:32 Haltron 5Y3 GT
07:16 sound test with bias monitoring 11.02W
08:12 RCA 5Y3GT
10:14 Adzam 5Y3GT
10:56 Switching POWER TUBES
11:00 Russian 6P6C 1973
11.29 General Electric 6V6GT
12:03 RCA 6V6GT 1959
12:36 Conclusion - next episode preview