Let me see if I get this and maybe this is what Bob and Penthode have been talking about but in a way I don't understand. I'm trying to keep up with the troubleshooting logic behind what you guys are saying.
I read Penthode's post about the supply voltage being stacked to make the 20 and -6.3 voltages available. Both voltages are across the amplifiers and the draw from those amplifiers is what keeps the voltage ratio the same? The fact that I'm getting a sine wave of 12.5MHz means the preamp is probably working OK and that primary amplification is missing? But if the voltage ratio is off in the preamp and it is getting -3.7 volts, the same as the output amplifier, wouldn't it be affected as well?
I'm giving myself a headache!
