Well now I feel stupid. I tried building one and couldn't get much out of it. Now that I have some pic.'s maybe I can get the transisitors properly oriented.
A good thing came of it though. I had put it on a bread board with 2 stages of a Vulcan and when I failed, I removed the op amp and stuck 2 SI diodes on the end of the 2 Vulcan stages, which should have a similiar effect to driving the diodes with the op amp. Sounds pretty nice. 8)
I removed the resistor and cap in parallel between stages and tweaked the by-pass caps. :)
Cool. I wonder why the circuit wasn't working?
Upon further analysis, I had built it sort of like the TS non DC version Joe posted as a stand alone circuit. I realize now that it wasn't properly biased. :oops: :roll:
I'm going to try it again and use a MPSA13 Darlington for Q3 assuming I get it working properly. Also some BS250's and J202's.
I think Joe's idea about switching the diodes in and out of the feedback loop and to ground is the way all op amp distortions should go. Also I will have to try R.G.'s suggestion for the FBL. 8)
Again, nice job and thanks for the GREAT Forum. :)
Aron, have you tried this with a BlackCat or Hot Cakes type ciruit? 8)
No I haven't. I haven't had those boxed up in years now.