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leo-666

Roland M-480 rework strategy
« on: January 12, 2017, 01:18:20 PM »
Roland M-480 line mixer

Hello.
I have a plan on changing opamps and caps in this beast.
The goal is to get the most clean sound out of it and also reduce noise.
Here's service manual.
http://www.filedropper.com/roland-m-480-service-notes-478433
http://pics.studiorepair.de/Roland/M-480/index.html

It contains upc4570, 4565, 5218 mostly, cheap, old, outdated opamps.
Caps are electrolitycs, ceramics, no film.

The sound of the mixer is compressed, tight, not open.
The goal - to get very transparent sound.
It shall be used to sum a lot of synthesizers before ADC.
So any noticeable alteration of the signal is not welcome.

Where to start ? What opamps to choose from ?
I thought bout changing 4570 dip to 5532.
4565 and 5218 are SIP, so 2114 can be a substitute.
Maybe somebody have any thoughts or expierence on this ?