Look at Williamson. Gain stage, cathodyne, another gain stage.
Cathodyne has 100% NFB. It rarely distorts before the tube which drives it. It can use a low-Mu tube of HIGH current, a better fit for the low resistors on power tube grids.
Cathodyne has no convenient place to inject NFB.
You can do it any which way. Gain-cathodyne is neat and sweet.
Cathodyne has 100% NFB. It rarely distorts before the tube which drives it. It can use a low-Mu tube of HIGH current, a better fit for the low resistors on power tube grids.
Cathodyne has no convenient place to inject NFB.
You can do it any which way. Gain-cathodyne is neat and sweet.
You could o it that way if you want, but it's not needed in most cases. The split load is a fantastically linear topology, and is very capable when given plenty of voltage to flail around in.
As an example of my favorite method of swinging lots of volts, I usually do a 6SN7 volt amp, into a 6SN7 concertina, and feed the outputs into a 6SN7 LTP standing on a CCS with a negative rail, with a bit of cathode degeneration per triode. With a supply voltage upwards of 375-420 volts, it'll swing all the drive you could ever need, and if fiddled correctly, you can direct couple source followers between the LTP and a following power stage.
As an example of my favorite method of swinging lots of volts, I usually do a 6SN7 volt amp, into a 6SN7 concertina, and feed the outputs into a 6SN7 LTP standing on a CCS with a negative rail, with a bit of cathode degeneration per triode. With a supply voltage upwards of 375-420 volts, it'll swing all the drive you could ever need, and if fiddled correctly, you can direct couple source followers between the LTP and a following power stage.
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