Yes I know, could only give it a try. I like the line-in/out on the Greta and want to convert that to a Champ 5C1 build... Think i got to find my inspiration somewhere else...
Don't know how fancy you want to make it.
Without some type of speaker simulation it will sound like ass .
(I am thinking a voltage divider like in an older Marshall amp )
H&K Red Box is pretty cool.
I think there are even DIY circuit boards available.
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