After making the 250 true bypass, I went ahead and did a few fidelity mods:
- I removed the stock 4558 dual op amp, which sounds like ass, and replaced it with a 1458. The 1458 is essential a dual version of the 741 op amp, which was the chip in the original 250 ODs.
- I removed the stock clipping diodes (I forget what they were) and replaced them with:
- two 1N914 switching diodes
- two 1N4004 rectifier diodes
- no diodes
All of which I put on a SPDT on-off-on switch. I forget which on-side is which pair of diodes, but the middle (off) is the no-diode setting.
So without further ado, here is the demo:
