On 25 Mar, 06:02, (Derwin) wrote:
In article , says...

And even if you do, you're stuck with 1970s Radio-Shack grade op-amp design.

Actually I opened it hoping I could replace an op amp but there are no ICs in
it at all. But I did eventually realize that the two big electrolytics are
probably part of the power supply.

youre probably not looking at quality then. The 70s was awash with
grotty discrete kit.


NT