First Build Problems- KLD kit Build

[imgumby001]

Well, it’s red plating again. I’ve tried various tubes- 6L6GC’s, EL34’s, and a bunch of the 6P3S’s and they all red plate at full vol w/full gain. Both sockets are doing it w/v4 tubes usually showing red first. One pair of the 6P3S ran for about 20min before any red showing, which is weird, right?

[jammied]

What's pin 3 voltage and the bias probe readings? In ready to play with volume , gain, and tone controls turned to zero?


To get this amp biased you need to take the pin 3 reading along with the bias probe reading. And then figure dissipation or use one of the online bias calculators.