I've now built 4 K12-Gs, 1 with the supplied transformers and PC board, and 2 with Edcors wired ultra linear and one with leftover transformers and point-to-point wiring. I used Auricaps for coupling, the UF diode mod and snubber cap mods for the heaters and AC from the power transformer.
When I designed the layout for the point-to-point box, I was thinking about the ultra linear wiring, it looks to me like R14, R18 and C9 are no longer needed, since pin 7 is pulled up and tied to the output transformers. Am I correct, or is there something I'm missing? It would simplify the power supply a bit if that lower voltage DC isn't needed at all.
Thanks in advance, Andy
I'm including some pics of my amp builds. The first three amps I hosted in cigar boxes by building the PC boards upside down (except the rectifier). The last build was the point-to-point housed in a Hammond chassis with the tube cage.
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