SD-1 Built !!!

[petemoore]

Sounds great.
 I'm certainly liking these OA builds better with, well so far I'm really liking the 4558's TI sent me. TL072 quite good too...5532 didn't quite do it for my taste in this circuit.
 I used trimpots for the 10k at the input, [which I wouldn't do again], and at the second OA's feedback loop, makes only a small difference.
 The tone pot is at 50k as it sits, I don't recognize any immediate drawbacks using that value. But I might throw a 47k across 1 and 3 just to see what that does. I'm not real sure what taper this pot is supposed to be, I know the tone pot in the TS is 'quirky'...on my TS I kind of tweeked around the pot to get something I liked,,,the tone pot on My TS is..'subtle'.
 The diodes are 1n914 placed just like the schematic, as is the remainder of the circuit.
 I don't think my newer/'old' SD-1 ever sounded this good, I don't know how consistant the originals were. IIRC it was somewhat noisy, this build seems very low noise.
 I took the OA voltages and the inputs and outputs seemed more tightly clustered than most of my previous builds, I pondered whether this is a result of the high precision op amps.
 The voltage divider is two 10k's and a 47uf from ground to the Vref...the schematic I used had no divider shown, so I looked at TS and Bluesbreaker dividers and used one.
 WIth the 4558 or TL072 it's a very nice sounding distortion.

[Johan]

I like that one too, but it needs just a little bit of moding....I've replaced the 0,018uF just after the inputbuffer to 0,2uF for a fuller, less restricted sound and also shorted the 4k7 just before the volumepot for just a little more boost...

Johan