Jetrepro, I'm very impressed with your work, and thanks for the advice on soldering and hookup wire. I like your choice of the Goldpoint stepped attenuator for volume control at the input of the amp. I use the same for my amp, and it is better than any preamp I have tried. I'm not surprised you got a big jump in sound quality by removing the coupling cap (input coupling cap correct?). Less caps in the signal path the better the sound, IMO. My amp only has one set of cap in the signal path (2 caps because it is a PP amp).
Your experience with copper and silver wire is same as mine. I think overall copper is the better way to go, and a small amount of silver wire can be used to "voice" an amp if needed.
Your experience with copper and silver wire is same as mine. I think overall copper is the better way to go, and a small amount of silver wire can be used to "voice" an amp if needed.