Is very much like the little pink amp a restored a few years back. That one was sold off, I just had too many amps around the house, and too little time to play them all. Little Pinkie was very wanted, just because of the color. But it also meant that I had to spend about 275 euro to wrestle it from the hands of some Flemish hipster soccer milf. It needed new tubes, a whole bunch of rewiring, filter caps and a new speaker. Then the guy who bought it haggle down to 350 euro, though I wanted 375....

Have some spill over on channel b and boost not working on one side and led light stays on on boost

Hello

I have been looking for a schematic for the ADA MP1 channel pedal, but no luck. This is the tube pedal. I looked at the VAULT ( and contacted MarshallJMP who sells parts for the old ADA devices.

I also looked to purchase one the pedals, but I do not see them for sale.

Please let me know if you have a schematic you could share, or maybe someone that has one and would be willing to take pictures.

Thanks
Rob

Another Exar pedals tracing, this time it is not one but two effects at once - MT-02 Metal and BM-02 Bad Metal. I traced both at once, as it appeared that they shared a single PCB.

PXL_20221231_150236846.MP.jpg
PXL_20221231_151241700.jpg

Both units seem to be manufactured same year - 1995 according to dates on potentiometers. I have boxes for both of them, but Bad Metal has a user manual, an Exar products catalog, and even a receipt from the store. It was old in 1997 in Warsaw for 77...

Hi, just reporting a repair on my 2006 MXR Dynacomp (rev E. with CA3080).

Problem was a frying bacon sound. I removed the socketed IC and audioprobed it. The noise was at both pin 2 and 3, so it was before the IC. Noise was also at the base of the first transistor, and up to the positive end of C2 (tantalum capacitor).

I replaced C2 with a good electrolytic, and noise is gone. Easy one, just make sure you add some leaded solder to the RoHS one before desoldering, makes it easier to desolder...

Many kilobytes have been spilled attempting to recreate the legendary Harmonic Percolator, and there are some that enjoy going to great lengths to find just the right transistors to recapture its classic sound. I'm more the type that wants to just shove any old BJTs in there and then jank with the rest of the circuit until it goes BRRRRRR...

I started with the Escobedo Harmonic Jerkulator:

Harmonic_Jerkulator.gif

Tim already did the work of finding sane values for a 2n390x transistor...

Hello all.

I recent spent a Whopping $10 for a UT-300 Ultra Tremolo.

Great sounding tremolo, but does anyone know how to modify it to make the LED flash at the tremolo rate?

Thanks

These TC Electronics pedals from the 1980s are tricky to work on and I'm posting this information for the benefit of all brave souls that take on repair of these iconic FX!

The potentiometer knobs are *NOT* a push fit, so the often-seen advice for using string or ribbon to pull them off will certainly not work.

If you gently remove the blue top by lifting/prising your fingernail or similar blunt instrument, this will reveal a screw which releases the knob. Lift the knob off gently as there's...

I traced Exar FL-1 Flanger from my collection 🎉. The unit should have been made in 1989 or later due to the dates on the pots (09-89). I even have the box 😅.

PXL_20221219_211836112.jpg

This trace was quite challenging due to amount of components on the small single-sided PCB.

PXL_20221217_195623135.jpg
PXL_20221217_191615264.jpg

As I started, I immediately realized that it was based on... Boss BF-2. But when I went to the LFO section, it was completely different. So it is definitely...

Hi all!

Just got this wah for cheap as the switch was dead.

Inside is a nice wah pedal! I replaced the switch with a qualitu TPDT, now it rocks!

(pics are on my instagram)
Rocktron - Classic Wah.JPG

I'm continuing to trace Exar pedals from my collection. This time it's FL-1 Enveloper filter. I have 2 of them, both made in 1993. I traced the one with the worse cosmetical condition because its paint was very fragile. The nicer one is on photos, with the box, warranty card, and instructions.
PXL_20221206_135104506.jpg
PXL_20221206_135123013.jpg
PXL_20221206_135143814.jpg

The PCB is a small single-sided; I traced it pretty quickly. It has two HEF4069UBP by Philips and one Motorola...

If a moderator wants to delete this thread for not being stompbox related then I totally understand.
Could you please let me know your specific reasons though?
Why am I posting this here?
[] I don't think that posting this to a computer-related forum would succeed - business interests would prevent it from seeing the light of day.
[] This forum supports the free exchange of information AFAIK.
[] It might benefit some forum members that use Windows Media Player.
[] Tenuous link - When you listen...

Hi all,

I picked up a faulty EBS Octabass pedal. It works, but when you are not playing, there are constant blips/bops. Essentially, if you even touch a string, you get some signal being generated. Sounds as if the issue I have is very similar to the one described in

I've done a fair amount of reading, and recall somewhere that it could be a pull down resistor (which seems logical to me). Is there an easy way to find which resistor it is from a schematic (the schematic is on the forum)?...

I needed an expression pedal and boy, this one is cheap!

M-audio - EXP pedal.JPG

EDIT: I found that I did already have a cable but I'd still like to know if the connector is something I can buy so I can make a 2nd cable.
Condor_Cable.jpg

I'm already searching doggedly, but I can't find a circuit diagram for this device. Maybe someone has such a circuit?

Hi.
A friend lent me this pedal, I wanted to see what it was.
Basically a rat with input buffer and two separate controls for dry and wet volume, and probably an extra output boost too (that I didn't trace).
The most interesting part was the gain/frequency resistor and capacitor (330 ohm and 6µ8, to save you some time) but what took me a really long time is what looks to me as a very elaborate clipping switch and volume control for LED clipping (controlled by the internal trimpot, described by...

Le HAUT-PARLEUR 18 Avril 1968 Générateur de distorsion.pdf

Le HAUT-PARLEUR 18 Avril 1968 Générateur de distorsion.jpg

PDF: RP219_01-1966_A_REFAIRE Reverberation modulation.pdf

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01 RP219_01-1966_A_REFAIRE Reverberation modulation.jpg 02 RP219_01-1966_A_REFAIRE Reverberation modulation.jpg 03 RP219_01-1966_A_REFAIRE Reverberation modulation.jpg 04 RP219_01-1966_A_REFAIRE Reverberation modulation.jpg 05 RP219_01-1966_A_REFAIRE Reverberation modulation.jpg 06 RP219_01-1966_A_REFAIRE Reverberation modulation.jpg

Radio-TV-Experimenter-1967-12-01 Universal Reverb.pdf

01 Radio-TV-Experimenter-1967-12-01 Universal Reverb.jpg 02 Radio-TV-Experimenter-1967-12-01 Universal Reverb.jpg 03 Radio-TV-Experimenter-1967-12-01 Universal Reverb.jpg 04 Radio-TV-Experimenter-1967-12-01 Universal Reverb.jpg 05 Radio-TV-Experimenter-1967-12-01 Universal Reverb.jpg

PDF Poptronics-1968-01 Meyer Reverb Adapter.pdf

01 Poptronics-1968-01 Meyer Reverb Adapter.jpg 02 Poptronics-1968-01 Meyer Reverb Adapter.jpg 03 Poptronics-1968-01 Meyer Reverb Adapter.jpg 04 Poptronics-1968-01 Meyer Reverb Adapter.jpg

PDF: RC-1963-03 Simple Echo Chamber.pdf

01 RC-1963-03 Simple Echo Chamber.jpg 02 RC-1963-03 Simple Echo Chamber.jpg 03 RC-1963-03 Simple Echo Chamber.jpg

PDF: Radio-Electronics-1962-01 Reverberation.pdf

01 Radio-Electronics-1962-01 Reverberation.jpg 02 Radio-Electronics-1962-01 Reverberation.jpg 03 Radio-Electronics-1962-01 Reverberation.jpg

Full article in PDF: Pop-1960-12 Controlled Reverberation.pdf

Pop-1960-12 Controlled Reverberation schematic.jpg

PDF: Electronics-World-1966-10 Simplified Tremolo.pdf

Electronics World Vibrato.jpg