Just struck me - be sure to do the TIP-Mod on that device before releasing it back into polite society. Most especially applicable to Jefferson Street models (19121 zip-code). And replace the 2N3055 output transistors with 2N3772 devices, matched if you can. It will be a very different amp thereafter.
https://www.updatemydynaco.com/documents/TIPmod.pdf
You will note that the 80 driver board is electronically identical to the 120 driver board as far as the TIP-mod is concerned. Just a lot less space.
Peter Wieck
Melrose Park, PA