Tube Amps / Music Electronics
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|previous: Morris I have some questions about cathode... -- 5/2/2000 5:42 PM||View Thread|
|5/2/2000 7:42 PM|
|kg||Re: Cathode Follower Questions|
morris, let me see if i read you correctly...
plate loaded stage
direct coupled from plate to grid of
cathode follower with resistance in cathode circuit
AC coupled (through cap) from cathode to one side of center tapped choke
center tap to ground
floating ends to output grids
in terms of which value of cathode resistor, just measure your voltage on the plate loaded stage's grid, which will be the approximate voltage on the cathode of the cathode follower. you can size the cathode resistance of the cathode follower using R=V/I. i'd say pull a couple of mils through it--that's really all you need. the gain through the CF won't change much with varying plate currents. because of the 100% degeneration going on, the CF's don't need very much current at all to be linear as all hell.
i like the inductive phase inversion/grid impedance. the outputs will be VERY stable with such a low DCR path to ground... not much chance of runaway here!
|Morris I believe you have it down. I'm tr... -- 5/2/2000 8:12 PM|