Not everyone agrees with me on this point, but, if I am a *paying customer* for gear/mods, I would like to know what is inside. I don't need a schematic, but exact chips/parts replaced and part #s, are important to me. Sure, there are some DIY types who may copy this stuff, but IMO there is still room here for both for-profit and DIY types. I would even hazard to guess that DIY types (like myself) have contributed some ideas, direclty or indirectly to the for-profit types.
Richard
I'm torn on this issue. Sharing the design of circuits I think is great, and I think it helps the real modder/DIY types to think about things and hopefully make even more revisions and changes to improve things.
I'm a bit more afraid that sharing specifics on parts used, esp for instance op amps, might put a damper on experimentation. People might instead say, oh Doug Oade uses this op amp in his warm mod, so I'm going to use it. Op amps can impart a definite flavor to the sound of gear, and it's great to have people try different amps to see what they do for the sound rather than blindly following other people's lead. There's already lots of info on the potential candidates -- been awhile since I've looked into it, but eg. AD712, LM6174, OP2134, THAT1510, INA217, etc.
It seems better to me to discuss the already known various candidates that might be used. And also discuss what types of op amp parameters can be used to determine if the amp will work at all as a replacement (not just basic functionality, but current draw/supply, etc) and discuss how various parameters might be expected to affect the sound -- eg., slew rate, voltage induce noise, CMRR, etc. All this seems like it would be better to spur DIYers experimentation rather than essentially saying -- go use this particular op amp as a replacement, it'll make your gear sound better.
I'm not positive about this, but I guess that's the direction I'm leaning.
Edit to say: Not to suggest this is what you would do with the info, Richard. We all you are a tinkerer extraordinairre.
But in general, I fear that providing specific part numbers would dampen experimentation, not enhance it.