Finally got around to looking at my 200S. The fuse blows a few minutes after switching from standby to operate.
Fuse doesn't blow with no tubes. For reference, I have replaced the power supply filter caps with the SDS Labs circuit board (http://www.triodeel.com/dynaco.html) and the rectifier tube with diodes, also on the circuit board. I put one power tube back in. No problem. I removed that tube and put the other in. Fuse blew. Okay! Bad tube, right? Wrong. I put the first tube in the second socket, and the fuse blew again. So, something about that socket or the circuitry associated with that tube, but not the other one. Tricky. Looking at the schematic, I can't see anything obvious that might cause this. Time for some voltage measurements.
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