Gibson Maestro G-1 Rhythm 'N Sound doesn't work [SOLVED]
- pmkipp
- Breadboard Brother
This is a 1967 "pedal" in its own little suitcase. Someone sent this to me for the cost of shipping. It is in mint cosmetic condition, but does not work. If I plug it in and crank all the output controls to maximum and crank my guitar and amp all the way up I can hear the effects very faintly on all settings. So where do I begin to look for the problem, or what could cause this kind of problem? I cannot find a schematic for this, which is not surprising. Should I look into replacing all the electrolytic caps given the age and probable lack of use for many years? I am attaching a picture. It kinda looks like Grandma's parlor organ from the 60's. Thanks for any guidance.
Pete's Pedals
St Louis, MO
St Louis, MO
- modman
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You didn't really search for the schematic, now did you? took me like 1 minute
http://tonefiend.com/guitar/welcome-to-the-museum/
http://tonefiend.com/guitar/welcome-to-the-museum/
- Attachments
-
- maestro-g2-rhythm-sound-fuzz-schematic-diagram.pdf
- Maestro G2 Rhythm Sound Fuzz schematic
- (540.81 KiB) Downloaded 246 times
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Audio probe audio probe audio probe.
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pmkipp wrote:I promise I did! Now, any advice about where to begin looking?
Build yourself an audio probe then, using a copy of the schematic, trace back from the outputs with the Audio probe till you get a good signal, next make a note of where you got the good signal and then trace back along the path towards the output till you loose the signal again, between those two points on the signal path will be whatever is causing a loss of signal......
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At best NOT at the schematic.pmkipp wrote:I promise I did! Now, any advice about where to begin looking?
You have a G-1 and the schematic is for a G-2 - which is a completely different unit.
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- pmkipp
- Breadboard Brother
I guess the G-1 schematic is more difficult to locate. I will do my best to follow the circuit from the input. It is a pretty packed house inside, as you might imagine. Great old classic components. It will be fun to poke around.
Thanks.
Thanks.
Pete's Pedals
St Louis, MO
St Louis, MO
- pmkipp
- Breadboard Brother
Finally, with some help, figured this out. It was a combo of a bad can multi-cap, and the input transistor. Now this works great, though it remains an extremely odd "pedal." Best effect is by far the octave fuzz. The percussion sounds are best if pushed into the background as they add a little edge to each note.
Pete's Pedals
St Louis, MO
St Louis, MO
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