Random thought, but I do own a post-war EH Scott that uses a gas regulator tube to provide stable voltage to the FM tuner section to keep it from drifting. Not impossible thats what yours is doing.
I think you're either going to need to find the schematics, or draw some up to figure out what you've got here. It looks well made, but all the transformers on it speak to being far more engineered than you'd get with typical consumer gear.
I think you're either going to need to find the schematics, or draw some up to figure out what you've got here. It looks well made, but all the transformers on it speak to being far more engineered than you'd get with typical consumer gear.