It's been years since i built this thing, and I never used the schematic GGG made, or the layout Mark put up. I guy just asked me some questions about a build not working right, and when i looked it up there's some errors on the posted stuff.
In the layout the cap going to the volume should be a 33nf, and not a 3.3nf. That will really pooch up how the bass control works. Also I used 2n5457 jfets, and not the j201's that are shown.
The pots i used were log, and not the lins posted.
Here's the original schematic i gave to Aron years ago.
https://i58.photobucket.com/albums/g259 ... astard.jpg
Of course there's tons of things that can be done to it. For one that input buffer isn't really all that great. At the time i was in a kick to get rid of as many series caps as i could. It'll work better if you bias it up like you'd normally see input source/emitter followers done. in fact you could make the 1M/1M voltage divider used on the srpp stage a bias tap like you'd see with opamp circuit fake split rail pwr supplies, and use that for both the srpp, and to connect the gate/base of the input buffer (don't forget to add an input cap).
Better yet is an input stage like this one:
- input.jpg (9.03 KiB) Viewed 4411 times
https://i58.photobucket.com/albums/g259 ... /input.jpg
This will give you an input stage with a high input Z, a little gain, and a low output Z. I don't have parts values listed because it would depend on what you use. I'd try a 2n5457/MPSA18 to start.
Last time i built it I had a buffer on the output. Easy to do.
For all the guys that built this, and it didn't work right I'm sorry I didn't look hard at the posted schematics/layouts. The one above is what i gave aron.
Later, PaulC
myspace.com/paulcaudio
i remeber that time. Srpp was a The Way To Go for a while and everyone followed. Thanks for the reminder of a "back in the days" moment 
