I just used what they had at Fry's. I just took the unit apart, and I apologize, but I can't seem to remember much of what I did - I must have been partially following the instructions in the BLA pdf. My unit has two opamps (both socketed now), and they're definitely OPA2134s.antichef, when you replaced the caps did you use a specific audio grade cap or general prupose? I have a Tube MP OPL.
Somnium7...I'm "going there" with my Tascam 58 and M-520...probably will with the Tascam M-x (mystery mixer) as well...
I know you have a lot going on right now...what a road. May it be going to better and better places for you.
If you have a chance to chime in on any of the above, I sure would value your input.
here is one persons impressions of opamp sounds in a headphone amp. I would not take it as fact but it is an effort and does catalog many of the common opamps.
Regards, Ethan
http://www.tangentsoft.net/audio/opamps.html
I got a chance to reall all of Samuel's paper and found it quite interesting.... A number of very highly regarded opamps are listed as having marginal desirability for audio applications. Which goes to show us that sonic desirability is hard to measure.
I am specifically thinking of the LT1358 where it is concluded that "This part might be interesting where good high-frequency distortion must be achieved at low quiescent current; otherwise there seams little to recommend this part."
For me the low quiescent current make this part a very desirable upgrade to TL072. Plus reports by Jim Williams and others inidicate that the LT1358 is very nice sounding upgrade.