21-09-2018, 07:12 PM
(This post was last modified: 21-09-2018, 07:14 PM by Murphyv310.)
I've added a cathode follower on some of my amp projects and used high quality pots of 20k between cathode and chassis, the slider AC coupled to the following grid with a low value of grid resistor of 100k the coupling cap was .22uf. It works well with no pick up but can cause some DC shift on the next stages when adjusting the volume due to charging and discharging the coupling cap.
I've also tried DC coupling stages, a little like the 3-3 but with an ultra linear PP output stage, it works well enough but any poor components, valves or supply that is not stable gives DC shifts, seen by the speaker cone being less than stable with no signal, adjusting controls can also cause problems, when it right the sound quality is outstanding though.
I've also tried DC coupling stages, a little like the 3-3 but with an ultra linear PP output stage, it works well enough but any poor components, valves or supply that is not stable gives DC shifts, seen by the speaker cone being less than stable with no signal, adjusting controls can also cause problems, when it right the sound quality is outstanding though.
