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Choices, choices.

The Machine is in some respects more complex than El Cheapo (170v negative supply, bias supply), and in other respects simpler (no current sources, no caps in the cathode circuits). I would expect that the parts costs would be about the same for equivalent quality.

I'm thinking of some sort of sand discreet or chip CCS for the tail, and just build a mongo bias supply to provide for it and the tail; the tail supply has proven remarkably noninfluential to the sound, in my experimentation.  As it is, the 5965s draw 3mA each (6mA for the whole amp), so a resistor and cheap toroid is viable. As we discussed privately, I'm eventually going to VHF single triodes for the front end, and they like 5-10mA each, so a very long tail becomes impractical.  This is something I got to get after.

I'm not sure what the final design of EC is, Jim. The only place I knew of to reference it was a mongerously long thread over on the other forum, and I didn't have time to wade that far downstream. Is there a more practical way to have a look at it?

Aloha,

Poinz


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