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In Reply to: RE: combination resistor/choke anode load posted by hennfarm on May 21, 2012 at 19:55:11
...a phono preamp or related circuit where he's making the plate load part of the filter. An intentional filter is the only reason to use a choke in series with a resistor that I can think of. That would cut highs and boost lows, so it well could be part of an RIAA circuit. Could even be a good idea; fewest parts, etc. You would have to make sure that the circuit is pretty insensitive to variations in tubes, or use a low impedance tube like a 6CG7.
Crap, now I'm thinking about working on one, like I don't have enough to do.
Follow Ups:
Another possibility is a choke loaded SRPP. The DCR of the inductor alone is usually insufficient to match the cathode resistor of the "bottom" triode. So, some resistance in series is installed. It really doesn't matter how the R and L are stacked.
Eli D.
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