Just wanted to give a heads up that Hugh Dean and I have developed a nice preamp with 40v p-p output with low distortion and SE Class A harmonic profile. It's been tested in prototype stage already. JPS64 will be releasing Gerbers for easy construction soon. It's a 5 transistor affair, very simple but clean output. Sound is superb and can drive any amp to clip without adding hardly any distortion.
AKSA's Lender Preamp with 40Vpp Output
Incidentally, we are running sims of a boosted 100v rail version that can swing 90vpp into 10kohms and looks like this:
Here is the schematic of the souped up 90vpp version:
The JPS64 design of the 40vpp version has SMT daughter boards on a main board with selector switches and PSU and looks like this:
Here is a closeup of the actual preamp daughter board:
For comparison, here my hand-made SMT prototype that I am listening too now:
Measured FFT for 20vpp into 7kohm load: