Rod Elliot Project 88 question

Nice looking work, well done.

Are those Wima MKS capacitors on the in and out?

Anything polypropylene and good quality should be well an upgrade.

Another option would be to switch the OPamps to the LME49720. It has some fancy skullduggery inside that is beyond my comprehension but prevents any DC, meaning you can omit the coupling caps all together. As the saying goes, the best capacitor is no capacitor.

I have done this in the post above yours and it works great and sounds fantastic.
 
Hello,

I finished hicoco's p88 pcb finally and unfortunately i don't have any dip switches to use at the moment.
Can anyone tell me which switch positions should i bridge for 14.5dB gain?

thanks,

Schematic Preamp P88.png
 
Any opamp recommendations for this preamp?

So far I tried AD712, NJM4565, NJM4580, NE5532, LM833. Bipolar opamps sounds somewhat dull, AD712 little bit more open but not perfect.

Btw, I didn't replaced R7AR and R7AL to 4.3K. Both of them 2.2K. I don't know how much gain I have with this resistors.. All dip switches are set to 1off & 2on.