:-XMouser 0,5 euro and use an adaptor pcb socket.
Never seen this schematic, interesting
Can you post other parts of the console where the lm 301 is used in such an odd way? What is the brand? I guess Dynacord or so, schematic feels German.
This is swiss...you'll find this in Studer x69 and x89 series (service manual and schemo all around)
Yes, soic to dip is an option, might stock soic until they become obsolete too.
I would personally still be tempted to use a modern op amp for the whole shebang (technical term), but the 5534 looks close to a drop in.
I might also reconsider the transistors used in the long tail pair if sticking with that approach, there are lower noise modern devices (probably). If you want to be closer to the original (why?) use the old transistor part numbers.
JR
Ok you say 5534 should work, now I wondering why they don't use it by that time then.
Is any single non compensated opamp able to do this (via bal/com pin) or some internal topologies can't ?
I was told and read that only 301 is a candidate for that, and I repeat this myself, but never search deeper on this subject.
Again I'm not here to discuss the improvement of this design, otherwise I will not use those desks. I know your position about this and you'r right mostly I guess, there is for sure better design today for noise figure, THD etc... but that's what I have and enjoy to use.
But don't make me wrong, I'm not that conservative...When bc109/179 died in the console I have no scruples to use 550/560

Best
Zam