Author Topic: [solved]schematic of "Invask Invasion SG15R" or "Epiphone Studio 15R" guitar amp  (Read 1645 times)

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Offline GreybeardTopic starter

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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.
« Last Edit: January 24, 2024, 08:15:16 am by Greybeard »
 

Offline GreybeardTopic starter

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

Offline donlisms

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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?
 

Offline GreybeardTopic starter

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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!
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?

Curious...  Why do you need the schematic?  Is broken?
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.
« Last Edit: January 10, 2024, 11:14:50 am by Greybeard »
 

Offline nanodocl

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Try to contact the manufacturer directly, sometimes they share!
 

Offline GreybeardTopic starter

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Try to contact the manufacturer directly, sometimes they share!
I asked manufacturer first but got no reply.
Sorry forgot to mention...

PS: Yesterday I received the Epiphone Studio 15R schematics from Gibson Customer Service.
After checking I can confirm the PCB is identical to the wanted Invask Invasion SG15R as I supposed, the Gibson/Epiphone is just missing one JRC4558 double OP amp and MIC-Level pot and input jack for MIC.
« Last Edit: January 24, 2024, 08:13:05 am by Greybeard »
 

Offline GreybeardTopic starter

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Someone asked me for the schematics:

 


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