I made it according Soldano-100 preamp schematic. There are 3 channels and 3-way toggle switch on the front panel. Left section consists of clean and cruch channels, right section is overdrive channel. Toggle switch in the middle position is for the clean sound (left EQ).There is serial-parallel tube loop (depending on FX control position).
Four outputs:
- main (high impedance) output;
- line (low impedance) output;
- cab emulated output for record;
- solid state 2w poweramp`s output;
Product Spec
• All analog low noise signal path
• Four tubes 12AX7 running at high anode voltage, anode voltage - DC 400v as is in real amp.
• Internal toroidal power transformer
• WIMA capacitors
• Treble Middle Bass tonestack for clean and crunch channels
• Treble Middle Bass Presence tonestack for overdrive channel
• High impedance main output
• Low impedance line output
• Low impedance cab emulated output
• Power amp output
• Foot switch output
• Serial-Parallel tube loop
• Alternative guitar input
• No digital components used. It is a pure analog device
• 19 inch 1U rack
• 120v or 230v versions
Sound samples - http://preamps.ru/soldanorack.html