hi everyone
i just found this old thread cause i recently bought a supposed-not-to-be-working nyc 3003 muff which turned out to be 100% functionnal and decided to try to modify the hell out of it.
i spent a good deal of time online, trying to find what does what, found kitrae’s review on all the different circuits and clones + list of mods (and tried a few), found lots of different sites and thread proposing pretty much always the same stuff (mentionned above) and didn’t quite found “it”.

so far, i tried jack orman’s version 2 of the AMZ tone control, bypassed emitter resistor of clipper #2 stage, replaced the first pair of diodes with ultrabright LEDs and the second pair with standard red LEDs.
i tried asymetrical clipping with 1 LED and 1 stock diode but it didn’t sound any different. i didn’t try germanium diodes since i read that the smaller Vr, the more compressed the muff.
it opened the sound, made it much less compressed and brighter (which is what i was looking for) but i’m still looking for something “different”, something wild and crazy.
i also tried the feedback mods on kitrae’s list, just made the pedal buzz.

i wanted to replace the tone section with a 3-band baxandall active eq but didn’t find any satisfying circuit so far, most of the circuits are for bass and treble only, and nowhere i can find how to design a circuit with my own frequencies and Qs. i could use the Xotic RC booster’s tone section with added mid control if i knew how to calculate the values, for instance.

i was thinking of changing the 3 470pF caps in the feedback of the first three stages but i’m not sure it will take me a lot further.

i’ve been a DIYist for a few years now so i can solder well, but everything i learnt at the college i lost with the years of not practicing, so i’m absolutely not able to take a circuit and find mods myself because i probably won’t understand anything i’m doing, so i’m asking you guys if you would know of a site/page/thread somewhere where i could find ideas to wilderness.
i’m not specially looking for ready-made mods, but hints or explanations of what such changes would do.
i want to learn but i need a little push, i believe.

if anyone has any idea, i would be happy to hear and discuss it
cheers

oh ok, i thought i read it in an article on your blog saying that it was almost the same circuit. so the ambitron is only a very short delay without modulation. actually i remember buying the scematics of the stereo version on your website, maybe it’s time to study the circuit a little further!

hi everyone

i’ve been interested in the hog’s foot/mole for a while but what i’m looking for is a simple ‘real’ bass booster, meaning one that doesn’t affect high frequencies, but all i could find is something like the Xotic boosters, with gain, bass, treble and volume controls… and they are really expensive too!

what i wanted to know is: could i run the mole/hog’s foot in parallel with the clean uneffected signal (with an AB box-ish of some kind), and mix them 2 so that i can have a bass boost and unity gain on higher frequencies, or this kind of setting won’t work (because of phase shifting introduced by the filter, or other reasons)?

thanks

great, thanks a lot! that’s precious information

could somebody tell me which transistor were used in the civil war muff, please?
i read this thread… not from end to end but i read most of it and everywhere else i looked i couldn’t find the answer.
thanks

the “modulation”, in my opinion, refers to both chorus/vibrato and the “effect” on the delay that already features on the memory boy where you can choose the shape of the wave and the depth of the modulation.
you should seek a demo on youtube, i saw one that was pretty relevant.
and the controls on the deluxe memory boy are (in order): blend – gain – rate – depth (which is basically the wave shape – triangle or square or a mix of the 2) – feedback – delay
there is 1 input and 1 output, a send – return loop and you can use an expression pedal
the 2 white switches in the middle part are “tap divide” and “exp. mode” where you can choose to control either one of rate, depth, feedback or delay

that’s all i can tell about it with the picture i found