The AIWA TP-1011 is the reel-to-reel tape preamp Richie Blackmore from Deep Purple used to drive his Marshall. I'm not a huge Deep Purple fan, but I do like the sound of some of these old reel-to-reel preamps. This layout is for the stock circuit running at 18v. If I ever get around to breadboarding the mods I tried in LTspice, I'll post another layout.
Here's the discussion on FSB, including a verified layout with a trimmer to control the first gain stage.
AIWA TP-1011 REEL TO REEL PREAMP - VERO LAYOUT
- The stock version sounds awful at 9v
- Replacing the 56k with a pot is necessary to control gain
SCHEMATIC AND POTENTIAL MODS
Reduce down from 18v to 9v. 18v had mountains of output level on tap - I can see how stories of Blackmore cooking amps could be true.
- Reduce coupling cap size to roll off some low frequencies
- Very flat response with the stock circuit
- Aiming for clean boost all the way to fuzz
- Try NPN germanium for Q3
- Trimmer to control gain of the first stage (as per FSB thread)
NOTE: images below are from the modded circuit running at 9 volts. The original will distort quite quickly, which seems to be normal. Basically to the point of fuzz.
