by Ty_Bower » Sat Mar 28, 2009 9:04 pm
B+ voltage looks a little high. I think the manual specified about 500 volts at the plate of the output tubes; you are showing about 560. Your heater voltages are a bit high too. They should be around 6.3VAC, not 6.8. While this isn't the end of the world, the tubes will last longer if you can at least get the heater voltage back into spec. It's kind of a pain - the old Dynaco power transformers were designed for 117V coming out of the wall. Most homes nowadays will run five to ten percent higher than that. Are your transformers original Dynaco iron, or are they modern reproductions?
R5 shouldn't be frying. That's part of the feedback circuit. No significant power should be flowing here.
Since you didn't build on the original Dynaco chassis, I'd imagine it would be VERY easy to accidentally get the phase of the output tubes "wrong" with respect to the feedback circuit. This would almost certainly cause the amp to oscillate wildly. I'd suspect that a 60 watt amp in full oscillation would fall into the "not good thing" category. All that healthy capacitance you've built into the PSU would only make it more exciting. Do you have a dummy resistive load on the outputs for your initial testing?
Edit... I'm staring at your pictorial diagram of your chassis wiring. It looks like you've got F going to the KT88 with the blue/white and green/white OPT leads. If so, that is incorrect. F must go to the KT88 with the solid blue and solid green wires. G goes to the tube with the blue/white and green/white.
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