Sooooooooo ... the Chinese amplifier kit I am building seems to suffer from this 110 volt vs. 120 volt AC issue as well. Although the kit now comes with a transformer clearly labeled 115VAC, I think they just changed the label on the transformer and not the transformer itself.
Here are my actual measurements. How big a problem is this?
Transformer specifications (no load) vs. actual (no load)
115VAC in -> actual 121VAC
275VAC out -> actual 300VAC
6.3VAC out -> actual 6.9VAC
3.25VAC out -> actual 3.5VAC
Power supply specifications (no load) vs. actual (no load)
380V out -> actual 414V
295V - 300V (regulated) not to exceed 300V -> actual 311V ... (the directions are very specific not to exceed 300V here due to the Chinese 6N1 tubes not being able to handle more)
Someone on diyAudio suggested that I order a couple of small power resistors to reduce the power to the filaments, which I ordered 2 weeks ago before I even started building, so I do have those on hand. They are 0.05 ohms 3W and 0.022 ohms 3W.
The kit also includes an "optional" 91V zener diode, I assume to replace one of the 100V zener diodes?
So I am left scratching my head? Do I really have a problem and can it be addressed without a 110V power supply or bucking transformer? I have the little resistors I mentioned for the filaments, and there is the 91V zener diode in the kit.
Tubes are 2*6N1 and 4*6P14 output tubes, not ECC85 and EL84 as shown on the schematic.