[Christiaan]

I had to dig out my little Box-of-Shame to find out but the Forum Vibe transistors are all EBCs. All 2n5088s with the exception of one 2n5210 for some reason. Again that was a Musikding kit, which is my go-to solution when I don’t want to do my own parts shopping.

If I flash a light at the LDRs I can get the classic swirling sound, I just can’t get the bulb to fire unless I send it power directly.

All good though, my freshly modded Vibe Single is scratching that itch quite nicely thanks to your help.

I’m still marveling at how much is crammed into such a small space on that PCB. Very impressive.

[Christiaan]

Reporting back: I snipped R3 to test things out and the vibrato is sweet but fairly subtle. However, there’s a bit trade off in terms of the controls. If you turn the intensity anywhere below noon, the warble becomes almost imperceptible. The voice control doesn’t seem to have be as pronounced either, but maybe I’m imagining that.

It would be nice if the vibrato was just a little more pronounced but then I do prefer my vibrato a bit subtle and not so seasick.

Now the question is whether or not I should make this an internal or external switch. Decisions decisions. I might also test out your idea with a trim pot replacing the mix resistor while I’m in there. Could be interesting on both settings.

Funny you mention the Forum Vibe. That was my first attempt at building a uni-vibe. I thought I was extra careful when building it, but I just can’t seem to get the LFO to light the blub. It still haunts me.

Thanks again for pointing me in the right direction.

[Christiaan]

Thanks for the quick answer. I’ll give that a shot and see what comes of it. Glad to know I was on the right track with R3.

[Author]

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