help! kt66 5e3 build hum...

[billyz]

Pull V1 then check for hum. Then pull V2 and check for hum. Mismatched power tubes can cause some hum too. Report back.

[billyz]

You could connect the filament center tap to the cathodes of the Kt66 as they are cathode biased. This is a common fix for filament induced hum, if that is what it is.

[passfan]

Follow the fender schematic for grounding. I had problems with the ceiratone scheme as well.

[a_e_a]

Hey guys,

Good news! I fixed the problem. It turned out to be the first 2 caps grounded at the same point as the output/power section. I regrounded them to the input jacks and voila!

Thanks to everyone who helped and gave suggestions. I am kind of happy that there was a problem as now I have learned a lot more about grounding.

Cheers everyone

[vibratoking]

Thanks for reporting back. I'm glad you got it fixed.