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Putting +18VDC would at first, fry the TC1044S. Next, C101, C102, C103, C24, D101, D102 and all transistor / FET components would have to be checked. The charge pump may have generated 31VDC for a few hundred milliseconds, which could wipe out 25V caps, The transistors and FETS might have...

The more gain stages, the more the self-noise of the ICs gets amplified. Many designs combat that with 47pF to 470pF negative feedback capacitors in the gain circuit.

That is a clean build!

Good recommendations, thanks! I'll have to experiment with them. This was built to the client's desires, who has a love / hate relationship with Tubescreamers. His main complaints were 'fizzy,' 'nasal mids,' 'too much gain, not enough grunt.' His main guitars for this pedal, are all...

I have not heard or built this drive, nor the one it is similar to. Looking at the schematic, that should have decent volume. I'd suggest posting pics of the populated board and double checking the component values, while waiting for other member's responses.

"The bad three pots dont have continuity..." If pins 1 to 2, 2 to 3 and 1 to 3 all do not have continuity (defined in the case of installed pots as: pot values in context to the resistance of the circuit), then your pots are bad. Not uncommon to have a factory pot problem where the metal lead...

I met a guy who claims he was audio probed and the aliens were rough on him. Kidding aside, I use a mobile phone, a four conductor 1/8" jack which converts to RCA with 1/4" phone plug, an app called 'Hz Frequency Generator' and create a 1Khz sine wave with the volume on the phone about 3/4's...

Where did you buy your charge pump (IC7) from? Normally, to determine if it is a bad charge pump whine you would remove IC7 and work off of 9V. However, this design derives its Rref and IC power return from pin 5 of the IC, so if you remove the charge pump it won't work at all. Charge pump...

Thank you. Your FET voltages indicate shorted or near shorted FETs, perhaps from overheating when soldering or you received a bad batch. They should be something around: D = 8 VDC G= 4 VDC (mid-way between D & S, for symmetrical clipping) S = 0,6 VDC (all voltages depend on the bias trim...

Are your FET voltage measurements in relation to ground? As in, common probe to ground (black) and hot probe (red0 taking the measurements?

A friend of mine has been on a quest for the tone of a loud Fender Black panel amp, at about 70dB of real volume. Think of a Vibroverb or Super Reverb on '4' to '7'. We have tried pedals, master volume mods, speakers, expensive attenuators and various amps. Nothing got close to the nuance of a...

A couple of thoughts, based on my experience: - If a charge pump is suspected (typically a 'whining' sound), remove it and the pedal will now be operating on 9V. If the problem is resolved, try another charge pump. If the problem is still there, reinstall the charge pump. - In painted...

I do not believe here is room for the Transcendence Boost PCB and the original Wha circuits inside a standard Crybaby. You could gut it and swap in a 3DPT, to have a volume pedal and a switchable boost and volume pedal. You would have to swap the 100K wah potentiometer for a 1M to 500K audio...

It is always the weirdest things, like a wire with no continuity, that keep you on your toes. On the bright side, it sharpens your troubleshooting skills.

Check your potentiometer sweepers (lug 2) for continuity (bad pot check). Also check C12 + R16 values (15Khz high pass bleed). Check all the values in the tone stack.

Correct - omit C4, otherwise the pedal is only usable on dark amps.

I agree with @gonzo that the pickups are good. I am guessing: pickup heights, or got the wiring out of phase, or other wiring error,or switch malfunction.

I watched a video about Tom's Bukovac (Nashville studio session player / sideman), and really liked how he uses the Vertex Boost with an expression pedal as a volume / boost. So, I borrowed one from a local music store that I repair for, tried it and liked it. I could not hear any difference...

Have you measured the ohms of the neck pickup with a DMM?

I owned a Sabbra Cadabra and its cousin, the Gallello, - both were noisy due to the built-in treble booster.