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In the Forum: Audio Discussions
In the Thread: How to get a LOT of SET power.

Post Subject: BiasPosted by N-set on: 5/23/2011

Paul, again the diodes are there not because they are diodes and one needs a diode action there, but because they wanted
to substitute cathode bias resistor with something that would have a big static resistance (to set the DC point and stabilize)
and small dynamical resistance (to avoid cathode bias action). The price to pay is of course nonlinearity, esp. in the output stage
where the current variation is big enough to feel the curved characteristic of the diode.
But you are right, I forgot to split the bias into the grid part (the choke RDC) and the cathode part to give the amp some stability.
I also haven't heard the axiom. If someone knows a better the topology, please let me know!
Same with filters, I have no idea how they work.

Cheers, N-set

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