Which schematic for 1980 twin reverb?

John Sassano · From: Danville, California, USA

I just bought a "73 twin w orange jbl's" for $875
Turns out it is a 1980 from the chassis serial F0+5 digits.
I assume its ultra linear but not sure which schematic I need.
It sounds amazing with half power but less so with all tubes running.
. Kind of disappointed but not returning it!
John

Ken Fox · From: Nashville GA USA

135 Ultra Linear amp for sure.

John Sassano · From: Danville, California, USA

Thanks Ken!

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