bobc
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I built a prototype, "test platform" of the circuit using "leftover" parts (I have a basement full). I used metal film resistors across the board, and some signal caps I salvaged somewhere, just cheap poly... and those cheapo 5K amazon transformers. Plays through 88db B&W VM1s plenty loud. The weakest part of this amp is the output transformers.
It makes music. In fact I now listen to it as I build other stuff. Hard to comment as to critical listening, and my future builds use carbon comp in the power supply to the plates.
I think of this amp as simple rustic Italian cooking, fewer, high quality ingredients. With fewer ingredients, each one affects the whole. The chef's recipe says carbon.
Some say carbon comp are noisy, some say they age poorly, some say metal film is more stable, glass anyone? Resistor basically functions the same regardless of core technology. Point is, they will work, the input tube gets its voltage. I wouldn't sweat the reliability concerns with cc resistors.
Resistors are also cheap relative to other components.
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