Philco 42-321 volume issue

[Kamakiri]

I'm working on, or rather piecing together, about the worst condition radio that I've ever come across.

This radio was a friend's grandparents set, and has a huge amount of sentimental value. It must have bumped around a lot of attics and garages....the chassis was rusty, and all of the wiring inside was rubber, and was completely rotten.

I've rewired most of the set and recapped it. Miraculously, it actually sounds very good but the volume is about twice as loud as it should be....wherein lies my dilemma.

Normally, I'd go in and start testing resistors, but everything in this radio is so fragile that I dare not do this at random.

Can anyone help me with what to look at here?

Schematic: https://www.tubesandmore.com/schemat...on-corp/42-321