For more info on the Roger Mayer Octavia read this:
Octavia History - Truth revealed ?
this:
Octavia Evolution courtesy of Roger Mayer
and this:
Roger Mayer Octavia Octavio
and look at the:
Tycobrahe Octavia schematic
and the
Roger Mayer Octavia schematic
This is the wrong Helios schematic where all came from:
A few years ago I posted the actual hfe of Q1-Q4 from a 1974 Rams Bead Big Muff with FS36999 transistors as measured using a Peak DCA55. They were: Q4: 163, Q3: 214, Q2: 171, Q1: 160.
Since that time I've worked on three more pre-1975 Rams Head Big muffs. Two had FS36999 trannys and one had 2N5133 trannys. Guess what...they all measured less than 200 hfe, lol. The one with 2N5133 trannys were as follows: Q4: 132, Q3: 117, Q2: 145, Q1: 128. I also noticed Kit Rae posted some of his own...
Howdy!
I like the look of the Urei Mod One discrete opamp. It uses 5 BJT transistors.
My question is how do I adapt this circuit to germanium BJT transistors? Got a bunch of Soviet ones and would like to use them! I am trying to learn the math behind it, so I'd like to learn why/how it works or doesn't work.
Can I reverse engineer from silicon BJTs? (Essentially the opposite of this:
Thanks for your help in advance!
I was just messing around on my breadboard a few days ago to try and build another Tone Bender MkII for myself with a load of 2N404's I received recently. I tried 10uf's like in the Marshall Supa Fuzz (another Tone Bender variant) in place of the 4.7uf caps and was blown away!! I was really surprised a few cap changes would make such a monster fuzz. Thick singing fuzz and sustains for days... I think I have a new favorite. Just wanted to share my joy. :D
hey guys
i just built one, i tried a lot of transistors and finally got some nice sound out of it. bias voltages are ok, no ugly noises on the decay
its gated in a nice way, with a hint of octave up when i back the guitar vol pot a little....
what bothers me is on a certain combination on the guitar volume pot and the fuzz''/ bias pot in produces a kind of octave down sound which is actually very pleasant
my question is whether this is normal. i havent heard of a zonk pedal doing this
OK, I’m finally digging through my pile of vintage pedals resurrecting them from the dead. Here’s a mid 70’s EH Echoflanger. If anyone has gut shots, schematics, layouts, info, etc. to get this puppy up, that would be greatly appreciated.
New member here, and my apologies if i am starting off on the wrong foot with my first post..,.i am hoping someone can provide some advice here as to what may be wrong with an old distortion box. I have an old univox superfuzz stomp box that when plugged in no longer generates a really cool crunch sound it now generates what really sounds like static. . It has two settings but both sound similar, like a static generator. Any ideas? maybe the capacitors need replacing. Afterall it has to be at...
I have a vintage Maestro Envelope Modifier on my bench. It acts strangely and doesn't really match my expectations.
In my understanding it should retrigger the ADSR cycle as you pluck a string (seeing the vintage EHX Attack Decay and Boss Slow Gear on youtube). For example set a slow attack, long sustain and fast decay and as i hit a note the volume starts to increase than it sustains and after that quickly mutes as it reaches the decay part of the envelope.
I received this pedal recently, it was found in a garage. It's in a rather sad state, as you can see from the pictures.
It looks like the Fuzz PCB is missing but I guess I can make the Wah work on its own.
I decided to take it apart, clean it and re-wire it. Below are a few shots of the PCB.
I've labelled the connection points on the PCB and am asking for help which ones are for the IN/OUT, 9V and POT. I'm sure this will be easy for the experienced builders.
essentially a superfuzz abnd univibe in one (big) box... love the damn thing to bits but its just too cumbersome to take on the road. i have never found a schem so am wondering a) does anyone have a schem b) could it be made into a smaller format and c) has anyone else based a stompbox on it?
Does anyone happen to know what part of the circuit effects the gating? I have been experimenting for weeks and getting a wide range of results, but I can't seem to figure out what components are the ones effecting the amount of gating. I know it can be done because there are mki pedals with a gate control. Just when I think I've pegged it, its wrong and doesn't work. I can usually figure these things out, but this is getting frustrating. Any help would be appreciated.
🤘
A self-proclaimed All-Knowing Guru is offering a corrected schematic of the Vox Repeat Percussion here:
There is at least one thing what the self-proclaimed All-Knowing Guru doesn´t know:
His schematic neither original nor is it correct - so it is more a fake.
For comparision purposes here is the (wrong) original schematic
and as FSB birthday present No. 2 is here a traced (and for this reason really correct) and tested schematic:
Sorry to :beatdeadhorse: , but I love Zonk machines! No one likes the sound of the Zonk II (including myself, until now). To me it sounded dark and had a weird abrupt cutoff about the notes...especially lower power chords and the higher single note runs. I attributed this to just being a crap circuit, but after adjusting the bias I changed my mind. I replaced the q2 collector resistor (10k) with a pot (as close to 10k as you have.) I used an audio pot, but a linear would probably work better. I...
People like guts? ok, here are some others from our japanese hackerfriends (click on the pictures for high resolution):
enjoy,
analogguru
as-1a.jpg as-1.jpg
I have the tranny numbers written down at home
D2DB32A4-2741-457D-B485-29F292EA7399_zpsgbxx1exx.JPG 43C541B6-295C-4C76-8600-A17E7B2DD941_zps6imrnbbk.JPG BEE653A1-4DA7-4F42-943D-CA23E31E0A6C_zps0petkvcv-2.jpg EF6F406E-9D04-4FA4-99C0-6954AE2E3F6F_zpsxcaxbqkw-2.jpg BDC75CD2-96F9-4ADB-A064-516E9D39B033_zps5nzkcrm4-2.jpg C99D0B6D-B7E0-40CB-B78F-F015ACA59301_zpsyurusowz.JPG BDC75CD2-96F9-4ADB-A064-516E9D39B033_zps5nzkcrm4.JPG 6A78CD99-380C-497B-B1EB-F260A0DAF0AB_zpswe6vadlo.JPG...
It seems that some people have had trouble building from the schematic. If one of you guys has component side board photos it would go a long way toward confirming the schematics accuracy.
It's amazing so little is known about this very early fuzz (1964!).
So far: It's the inspiration for Buzzaround (???) but 4 transistors.
Here is a link to an article about it
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