RL12P35 SE Amp – part I

I have plenty of these German WWII pentodes. I’ve been saving them for a few projects. Quite likely for a push-pull amp given the OB speaker project I’m cooking. Either way, I have a nice set of CFB SE as well as PP OPTs from Toroidy custom made. They are very good transformers.

So, if you want a simple SE amplifier that can do 8W, here is a good contraption to go after:

Continue reading “RL12P35 SE Amp – part I”

RL12P35 German Transmitting Pentodes

It was pure lust and love at first sight. I found the RL12P35 german transmitting pentodes and couldn’t resist in buying them. A very nice set of NOS Telefunken and Valvo valves with also NOS sockets. These pentodes look like a de-rated LS-50/GU-50 and very interesting candidates for a nice PP amp:

These have been used by Lorenz to build the classic and lovely PP amp LVA/BA30 RL12P35 Amp with anode to grid feedback (i.e. a la Schade) like the below amplifier:

Continue reading “RL12P35 German Transmitting Pentodes”