May 3rd, 2016, 12:41 pm
May 3rd, 2016, 1:19 pm
Grover Gardner wrote:What determines the size of that cap, out of curiosity? Also, would this work with DHTs? Not sure why it wouldn't, unless the filament current would interfere with the CCS operation?
May 3rd, 2016, 1:50 pm
May 3rd, 2016, 2:48 pm
Stuart Polansky wrote:Not sure, but I think each cathode "sees" the effective DCR of the opposite tube's cathode in parallel with the cathode impedance of the tube (as in the output of a cathode follower). In that case, the CCS would be swamped by the few hundreds of ohms of the cathode impedance. But that's just a guess.
In any case, it is a high pass filter. Start with Richard's values and see where the low cutoff is. Adjust from there.
May 14th, 2016, 1:14 am
May 14th, 2016, 12:04 pm