Hi guys, I'm repairing this amp but actually I cannot find a solution.

Clean channel and Power Amp works correctly.
Boost channel works but has a really low volume.

In attachments you will find the schematics.

I checked the tube section and everything is fine. Autotransformer works.

Voltages at tubes are:

1 - 181V
2 - 110V
3 - 110V
4 - 5,8V
5 - 5,7V
6 - 110V
7 - 0
8 - 0,675V
9 - 0

D3 Cathode - 266V

IC3 and IC5 are working because the switch is works correctly. I don't have replacement at...

Recently I built an MXR GT-OD.

W20K is recommended for the tone pot, but I didn't have it in stock, so I made it with B25K.
I know that it is used as a replacement for the W20K in many TS pedals, and I also have a few TS pedals made with the B25K.

However, make my GT-OD with B25K, the tone was too dark when the tone pot was set to 12 o'clock.
I looked for other errors, but there were no special problems, so I purchased a W20K and replaced it.

There has been a big change. It gave me a...

It’s been a couple of years since I’ve made the first Pelota delay: from the very name, it was a circuit inspired by a few popular PT2399 delays, such as the Rebote series, the Deep Blue Delay, and many others that aren’t that different to be worth mentioning.

Even then, with my more limited experience and knowledge, I knew I could try to do better, starting from the awful, noisy, high resistance inverting input stage you find in the vast majority of them that makes you wonder who did it first...

Hello,
I haven't seen anyone do this yet, so I thought I'd get one and trace it! Please let me know if there's anything that you see that looks obnoxiously wrong, or if there's anything that you think I may have missed.

No, the VD does not stand for venereal disease . It stands for vintage delay .

There's a Cool Audio V3205 under the hood. The clock chip is marked CD3102GP, which is NOT made by Cool Audio. Does anyone recognize the manufacturer logo on it?

Bottom side has a shit-ton of SMD, as expected.

I managed to eek out a bit more than 300ms out of it by dicking with clock trimmer. But it's a very tight range that sounds good (to me).

For the money, it's a pretty good short analog delay. The filtering...

This is my first attempt at PCB design. I chose a simple circuit and followed along to DigiKey's KiCad tutorials. . The One Chip Pony only does one trick—and it only uses one chip!

Clown color hydro-dip finish felt appropriate.

Maybe it looks a little silly in such a large enclosure, but I needed the extra room for the giant knob! This layout was designed specifically to accommodate the knob and switch, and also to be easy to troubleshoot.

An input gain stage feeds a comparator....

I bought this pedal for £40 and I am impressed with how quiet it is even when I use a crap 9V supply that I know gives hum ripple. Looking at the Boss circuit my question is does this bit work or is it an error? It has a cap connecting base to ground so is the bias just the resistor? I have never seen a circuit like this.

I have been interested in pedals, and I knew nothing, but I wanted to learn. So I just sort of started buying the cheapest versions of effects I could find to see what's in them and see how they sound. I still now almost nothing, but in the process of exploring things, I accidentally found the very cheapest way to get pedals shipped to the US.

If you are interested, below are some price examples so you can see what I mean, and my method for using AliExpress....

Considering only about 50 of the Rockman Ultimatum Distortion Generator pedals were ever released, and having gotten my hands on one for a time, I thought it wise to trace and verify the circuit. I spent a good amount of time, coincidentally with Robert (@PedalPCB) doing a trace of the same pedal at the same time, I took the time to breadboard the circuit based on the trace I made - but without the low-battery and buffered-bypass sections.

The complete set of notes, layouts and schematic is...

Another curious question of mine, are claims of a BBD chip inside true? This is the cheapest 4-knob flanger I could find so I grabbed it for $10 shipped.

Inside I found an MN3207 BBD, an MN3102 Clock Generator, 2 x RC4558, and an 062C. Three trimpots all with the index mark at exactly 6:00 and 12:00, which makes me wonder if they'd been adjusted after assembly at all. I'm still playing with it before I dare adjust those.

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