Do you have a multi meter to take voltage readings? Should be possible to spot what’s wrong with them.

Replacing chips at random isn’t the best way to go about this.

First off, is this a vintage unit or reissue? If you’re unsure, if there is a square cut out in the circuit board with a blue switch using more than 3 lugs, it’s a reissue.

Second, do you have or have access to a digital multimeter? If you do, can you post voltages of all 4 chips in the pedal going in this direction…

Chip
Notch
1 8
2 7
3 6
4 5

and the 3 (or 4 depending if vintage/early reissue or reissue) transistors.

Third, since you’ve owned the pedal, did it ever work? If so did anything specifically happen to it before it stopped?

Hmm, odd that didn’t work anyway, they’re both dual op-amps, unless you mean you replaced the 358 with the 4558, the LFO might not have kicked in. Besides the point, glad you got it working!

The Micro synth I can help with too but you will need a multimeter if you’re going to attempt it unless it’s an obvious issue to the eye.

In storage I would imagine either some damp got in and there’s some corrosion somewhere or if it’s 20+ years old some of the electrolytic caps have dried up from age.

Hope that can be made to run again too!

In the Small Clone? The Trim pot sets the bias of the MN3007, it shouldn’t really be adjusted unless it goes out with age. It works within a small range and at a point in that range will be set for optimum bias.

You should tweak it for the least distortion with your guitar (you can run a constant signal through to make this easier, building an audio probe and probing just the output of the BBD will help further) or if you have an oscilloscope, do so on the outputs (pins 7 & of it.

The EH Man is known so for a reason, I’ve never worked on a MicroSynth but he’s probably seen that part fail a lot in his time if he’s brought it up.