On Sat, Mar 1, 2025 at 01:31 PM, Alek Petkovic wrote:
>Hi Jim.
>I tried a large value electrolytic across the bias string and every time I keyed up, the ZSAC would take a while to stabilize at the set level. When I stuck something like a 22uF in its place and it seemed to be better. >Without trying to work out time constants and such, I figured that the 22uF would still provide the good dynamic regulation during speech and CW transmissions. Dunno if I did something wrong that initial time but for >better or worse, I've always settled on the lower value caps since then.
>Cheers and thanks, Alek VK6APK.
##? what tube were u using ?? ?This makes no sense at all.? The string of diodes and the parallel? cap are in the circuit at all times...and in series with the 50-100K? cutoff resistor.? We used 7000 uf on buddy's 3x6 amp...and when 200 ma idle current drawn, it was rock solid.? ?I have also tried as much as 45,000 uf? (3" diam lytic with mounting bracket)....same deal...doesn't budge.? ?The V drop across the string of diodes is constant, whether the cutoff resistor is shunted or not.?
This one baffles me.?
