Gorilla GG 20c Chorus - Looking for Schematic or Manual or Spec

[kagliostro]

I recovered a small Gorilla amp the GG 20c Chorus

it is covered/encrusted with dust but in good condition (don't know if it works)

but I'm able to find near no info about it

the only thing I know is that Gorilla was a brand joined with Pignose, it has a Chorus and Tube Stack Distortion (?)

Does someone knows where I can find a bit of more info ?

Thanks

Franco