I have receantly got a pair off Sennheiser HE-60 with the amp HEV-70.
A search on the combo did provide a little information, but not as much as I would like.
Many seem to dislike the HEV-70 amp and complain about the inferior 741 OP-amps that are suposed to be in the unit.
In my amp I have TL074s. They are the high temp version (I) wich could be missread as a 1 perhaps?
To my question: -I tried to replace the TL074 and used OPA4134 wich are supposed to be pin compatible, but they do not work?
I switched back to new TL074s and everything worked ok again - any sugestions on why the OPA4135 do not work!
/Roger
