Grant Richter wrote: > The RC4136 has a non-standard pinout and is not recommended > for that reason. There's a pin-for-pin replacement, the TL075. But don't expect the same performance: the 4136 never latches up and it's far more stable. The TL075 is really a TL074 disguised as a 4136, with its odd pinout. Edu Silva ES2 Audio http://audiolist.cjb.net