ta7136 substitution

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…

TA7136 vs fake

…booo.

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).

TA7136 to TL071

Here’s a strangely moody photo of the resulting stripboard.

TA7136 > TL071 stripboard adapter

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.

5 comments

  1. 1st January 2019Arri says:

    Just curious do you think this could be used in a CE1?

  2. 1st January 2019ua726 says:

    Can’t see any electrical reason why it wouldn’t, though it might be a bit tall to fit in the enclosure? Dunno.

  3. 4th January 2019Arri says:

    I’m actually trying to make a clone of one.
    I was just gonna copy the original PCB and populate it.
    My only worry was the fact that pin 1 and 5 aren’t going anywhere.
    Thanks for the reply!

  4. 4th January 2019ua726 says:

    Nice, good luck with the cloning! If you write it up would love to see a link in the comments here.

  5. 11th January 2019Arri says:

    I’ll probaby write it up when I’m done. 🙂
    I’m planning to use it as a test bed of sorts to see if I can get other more common ICs to play nicely with it.
    If I clone it will you strip-board it hahahaha.

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