Recent content by PedalBuilder

The Harmonic Percolator is a really fun little circuit. If you still have it on your breadboard, try playing with different values of R1. You can get some cool sub-octave undertones with large values (2.2M-5M). Replacing R3 or R4 with potentiometers is also a cool mod (try a B250k and a 62k...

This looks and sounds awesome! Definitely going to breadboard and/or build this.

It's a CDT3460-02 LED flasher IC. It seems to be big in Japan, based on a quick Google search. Here's the data sheet.

Quite a few of us here have large stashes of germanium transistors and transistor testers. What are you looking to build?

Personally, I prefer having the leads over a built-in slot. You will run into trouble if you keep hooking/unhooking them to transistors, but that's also not the optimal way to use the DCA55/75. I hook mine up to some of the longer breadboard jumper cables from Tayda, plug whatever I'm testing...

I’m curious about this. What would make one MP38A sound good but not the others if it isn’t the bias/hFE/leakage? Is it hfe? Collector-base capacitance? Something else?

Well, there goes my excuse for not building one.* *Yes, I know that you can just jumper it without any impact on the tone. But it looks cool, so I'm not building one without it.

The TY-141P used in the Duocast/Simulcast would be a good one.

I saw yours when I was doing my research before building mine—it's a very cool build. I think that the Chuck mod version might just be different enough to justify a second build, especially if you tweak the tone stack.

No, I think it was the thread from the Wish List forum that Chuck referenced. But the mods that he mentions are the same. Edit: Is the whole wish list subforum gone now?

Forgot to add the takeaway, so here it is. Despite its strong Muff ancestry, this sounds more like a Tone Bender than a Big Muff. There's some Muff-like (phase cancellation?) character from the tone stack, but the distortion tone and interaction with the volume knob are much more similar to the...

Another Tone Bender that is more of a Big Muff. Take the first two stages of a Colorsound Supa Tone Bender, add a third stage that is part Big Muff and part Tone Bender Mk. III (with a Zener diode rather than the customary 10k/10k voltage divider), stick a weird variant of a Big Muff Tone Stack...

You should be fine with any NPN germanium transistor with low-ish leakage and gain between 50 and 100. There's a bias trimmer for the emitter resistor, so it can accommodate a pretty wide range of transistors.

You might find this helpful.

What kind of tube screamer is that?