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Arion SCO-1 schematic
Anybody have the schematics for the Arion SCO-1 Stereo Compressor pedal? TIA.
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Glitchy Boss FRV-1 Fender Reverb
Boss FRV-1, bypass works, effect signal works. However, when the effect is on, there is also a repeating, pulsing sound continuously. The sound is similar...
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Matamp gt120MV schematic needed
Hello everyone! I`m making a tube amp for my graduation work and I decided to make a Matamp based one. I only found schematics for the non-master volume version...
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Super Champ XD footswitch/channel problem
***Quick bio - former electronics/radio tech and lifelong tinkerer. That said schematics and voltage chasing was never my strong suit. More of a "poke...Last edited by allprobbob; 11-12-2022, 10:39 PM. Reason: Edited title and added schematic after reading stickies, cheers.
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Boss DD3 Repair Mystery - Signal not passing IC
Hi everyone,
I've been working on repairing a Boss DD3 delay, here is the service manual: https://www.synthxl.com/wp-content/uploads/2018/04...
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Boss PS-2 weak effect
I got a Boss PS-2 that seems to have a weak effect signal. The bypass is fine, as the is the bypass in the mix, but the effect seems awfully soft. In the...
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1980 EHX Small Stone - Power Filter Issue?
Hi everyone,
I'm currently working on an EHX Small Stone Phaser, made ~1980. I think this is close to the "Issue J" circuit, with "EH1048"...
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Help with Arion SCH-1 Chorus/Vibe Mod
Hi everyone,
I've been working on an Arion SCH-1 chorus pedal from the 80s. It had a sketchy footswitch, so I decided to convert the whole thing...
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Twin Reverb '65 Reissue Reverb Effect Not Working
Help please! My reverb channel doesn't seem to be working properly. I can hear the reverb responding when i tap on the tank but it's not affecting the guitar...
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Squealing / Drill -ish Sound from Amp.
Hey Guys,
so i finally tried to fix my old Valvestate vs100. Iam far away from an Expert. I can repair my guitars and stuff but never tried...Last edited by Jaoon; 05-12-2022, 07:33 PM.
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Peavey Classic 30: Help identifying mods
Hi everyone,
I recently bought a used Peavey Classic 30, since I heard good things about the amp.
When I turned it on it hummed...
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Modulation not working on Ibanez DMD2000
Hi, I purchased an Ibanez DMD2000 second-hand knowing that it had issues. Sadly for me, the main issue is that the modulation simply doesn't work:
...
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Digitech RP20 Valve schematic
Anybody have a schematic for the Digitech RP20 Valve pedalboard? Mine was working, then it started to seem to "have trouble" staying on, where...
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Bizarre problem: Ibanez CP9 Compressor - No sound when off
Hi everyone,
I'm working on repairing a 1981Ibanez CP9 compressor pedal, with a very strange problem: It works seemingly perfectly when turned...
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Boss DM2 Analog Delay Repair - Low supply voltage
Hi everyone,
I've been working on repairing a version 2 Boss DM2 analog delay, service manual attached. After sorting out a short at the potentiometers,...
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1980s Ibanez FL-9 flanger repair
Hi everyone,
I've been working on repairing an original Ibanez FL-9 Flanger, and I'm quite stuck, to say the least. Here are the symptoms:- Only
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Ampeg SVT-350H problem
I have an Ampeg SVT-350H that isn't outputting to the speaker jacks. It outputs through the power amp out jack, so the problem must be in the power...
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Ibanez PT-9 Phaser Bias Adjustment
Hi everyone,
I've been working on repairing a Ibanez PT-9 Phaser, and have already made a lot of progress, thanks to help from this forum!...
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Ibanez PT-9 Phaser LFO Failure
Hi everyone,
I've been working on repairing an old Ibanez PT9 phaser (service manual attached). The unit had leaking capacitors and damaged tracks,...