Electronics > Repair

[solved]schematic of "Invask Invasion SG15R" or "Epiphone Studio 15R" guitar amp

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Greybeard:
This is the guitar amp:







This Epiphone Studio 15R front layout looks very close, just mic input and level pot is missing, may be same PCB (?) :



I searched both in google but couldn't find schematics.

The SG15R contains a 2-spring reverb tank and a handful of JRC4558 OP amps.

Greybeard:
Does anyone know which guitar or amp forum I could ask for?

donlisms:
Doesn't anyone reverse-engineer anymore?  Goodness gracious - how did anyone ever fix anything before google?  :)  I will say this - when you invest the effort to draw a schematic, you end up with a pretty solid understanding of how the thing works!

Curious...  Why do you need the schematic?  Is broken?

Greybeard:

--- Quote from: donlisms on November 23, 2023, 04:54:15 pm ---Doesn't anyone reverse-engineer anymore?  Goodness gracious - how did anyone ever fix anything before google?  :)  I will say this - when you invest the effort to draw a schematic, you end up with a pretty solid understanding of how the thing works!

--- End quote ---
No question I could reverse engineer the amp, if I invest about one workday. But why should I re-invent the wheel, anyone has done before in the best case?


--- Quote from: donlisms on November 23, 2023, 04:54:15 pm ---Curious...  Why do you need the schematic?  Is broken?

--- End quote ---
It's not broken. The amp just sounds not as bad as I expected for such a cheap practice amp. In fact it sounds quite decent...
So I wanted to know what's inside the blackbox.

nanodocl:
Try to contact the manufacturer directly, sometimes they share!

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