Some of the System 700 modules use Toshiba TA7136 SIP opamps (datasheet), which are long obsolete and semi-sought after by DIY guitar types because it was used to apparently pleasing effect in a Boss distortion pedal. An eBay seller is trying to get the best part of twenty quid for one.
A while back I bought a bunch from Utsource, and when I eventually got round to making a board to test them I found they were fake…
I made up this adapter for an alternative op amp, ‘cos I don’t think using this particular chip is that important (for now, anyway).
Here’s a strangely moody photo of the resulting stripboard.
After this I cut one chunk out of one side of the board to indicate pin 1.
I’ve had this working in the 708 noise/ring mod and the 711 output module, and it works fine, although I’ve not had a chance to compare it directly to the 7136.