My step-up transformers arrived and I could finally hear what the Quad II's sounded like, with luck. I didn't have great luck: a few minutes of good-sounding music from one amp, then switched to the other and a transformer fuse blew immediately. Switching back to the first amp, it played for less than a minute before a transformer fuse blew. These are 200W transformers. My homemade) cord is fine, transformers work with nothing plugged into "240 Out", so the problem must be in the amps. All I've done is to install RCA jacks, the center (for the pin) going to Jones plug socket #2, called "Input" on the circuit diagram, where the RCA jack shell goes to ground. Resistor R1, 1M ohms, is still in place between socket #2 and ground. I can't see that I've done anything bad there, getting the RCA jack installed. My question: where should I look for the trouble that's causing the transformer fuses to blow? Not easy to answer from a distance, I realize--but with so much expertise available on this Forum, why not try?
I've ordered replacements for all resistors but the 3W 180R ones, which read close between the two chassis, and replacements for film caps C1, C2, C3 and more film caps to use as bypasses wherever I can find the two connection points for out-of-sight electrolytics. Maybe making all those changes will eliminate the blown fuse problem without my ever discovering what it was. Hope springs eternal.