cathode follower

[renhoff]

wsaraceni wrote:
if you were modding an amp and someone told you to add a cathode follower between the last stage and the resistor that goes to the PI input, how would that be drawn on a schematic?
A Cathode follower before the PI would be a good place to generate some 2nd order (fatten up the tone) Harmonics, and some compression since there is plenty of signal to drive it..This would be the only reason I would consider using it..(before the PI)

Hope this answers your question..

Tony

This is an old thread but here is what I am seeing/hearing. Tony's answer is the best one I've seen. The valvewizard's website describes the dc cathode follower it in detail. I've built an amp with the cathode follower as the last stage before the PI. The Fender buffer/cathode follower output comes off the cathode's 100K resistor which is going to ground. The coupling cap before the PI blocks the dc. So a wire from the cathode to the cap get's you there. You can also split this 100k resistor to a 20k/80k with the 80k to ground like the Soldano amp. Then the wire would go to the junction of the 20k and 80k resistors and to the coupling cap for the PI. Slightly different sound, maybe a little warmer.