Nifty, neato little Guild amp.......
The tube layout looks like my '55 Model 66.....but I'm not knowledgeable enough about the working of the chassis layout and wiring to make a proper comparison. It might be a different thing inside.
So far I'm doing my best to learn a few things but I leave the work to my amp repair guy who's been able to get my assortment of old oddball amps working quite well.
I had offered up some photos of the chassis layout once upon a time but got preoccupied with crazy life and never got back to it.
I'll make a better effort if the info might help. Mine's been serviced and made safe with an isolation transformer, so there were some changes made.
You might see and understand whats stock and what isn't and possibly it might be of help.
The important thing is that it works well, runs quietly and is reliable (so far)...the old RCA 12" speaker does its job nicely.
I think it sat for years in a closet under its nice canvas cover for years waiting for someone to solve its problems!
ziz