I bought a Valvestate 8040 used. Looks like parts have been replaced before and the boost channel is not working.
The voltage on the tube's heater is...
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Valvestate 8040 transformer taps
Last edited by dweingarden; 04-08-2024, 01:57 PM.
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Mooer Red Truck
Customer brought in a Mooer Red Truck pedal that is confusing the hell out of me. Mooer hasn't been very helpful and has not provided a schematic. The pedal...
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Digitech Whammy IV overheating issue - HELP?
Components in my Whammy are overheating and I don't really know what I'm doing. Apologies if I'm in the wrong area or just generally ill informed - I'm just...
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Digitech PDS 8000 & 20/20 issues
I have a Digitech PDS 8000 and a 20/20 and both are really grinding me. Neither work properly. Each have had the electrolytic capacitors changed. The 8000...
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Need Help with circuit Diagnosis (CRATE CR-112)
Hello, I am fairly new to circuits and amps, and I have an old SLM amp id like to fix. It’s my dad’s and it never really worked to well. The pots...
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Triangle Big Muff circuit - swap NPN to PNP transistors?
Hi everyone,
Some background:
I'm starting a new project, retrofitting a V1 Triangle big muff circuit into an old EHX enclosure,...
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Ibanez DMD2000 not working
I’ve had this dmd 2000 for about a month and everything worked except when I would change the delay time it would make a loud noise. Now the delay doesn’t...
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Peavey Valveking VK100 died
Hello everyone,
Just last week my Peavey VK100 MK1 died on me. I was playing in a rehearsal and it suddenly went silent. It didn't shut down...
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Ibanez AD-80 repair
I've been pulling my hair for some time on this vintage Ibanez AD-80. Originally it created the effect, but the effect would die off after maybe 30 seconds....
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Digitech WH-1 problem
Anybody have experience with dead WH-1s? I have one that doesn't function or light the LED. The photocoupler LED inside the pedal does light up, and I believe...
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Help with 1970s Guyatone Moving Box Flanger - SAD1024
Hi everyone,
I've been working on a Guyatone PS107 Moving Box Flanger, after a search online I found out that the PCB was identical to a Vox...Last edited by clarisso11; 12-20-2023, 01:53 PM.
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Boss PS-2 schematic
Anybody have a schematic for a Boss PS-2? I have a really bad volume drop for the delays, while the pitch shifting section is fine....
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18V Danelectro Cool Cat Chorus gate problem
I have an 18v Danelectro Cool Cat Chorus pedal where the effect works for a few seconds and then stops "effecting" as if a gate is switched on....
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Original DL4 freezing
I have an original DL4 that freezes up shortly after freshly being turned on. Usually cycling through the effects quickly will lock it up. Restarting the...
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Electronics fault with my Electric guitar setup?
Hi there been having issues seemingly with my E-gtr at the moment, accept I can't diagnose what the issue is, a cable, pedals or the guitar itself.
...
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Selmer PA100 solid state
Please does anyone have a schematic for this unit? I can only find the valve versions, not the solid state one. It's this one - https://www.vintagehofner...
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Ibanez TS9B Schematic
Anybody have a schematic or a trace diagram of the Ibanez TS9B Bass Screamer?...
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Zoom 9050 schematics
Anybody have the schematic for a Zoom 9050? I'm getting all sorts of artifacts and noise through some effects even though I swapped the caps on the analog...
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One Control Anodized Brown IC
Anybody happen to know what IC the One Control Anodized Brown distortion pedal uses? I'm getting a high squeal after 12 o'clock on the gain and the IC is...
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Ampeg SVT-VR Bias control
I have been working on an Ampeg SVT VR for a few weeks now and replaced the power tubes and all electrolytic caps and am waiting on the owner to buy new preamp/driver...