I will be interested to see how this Stereo PP 6L6 Amp sounds - I'm making it
from multiple 1940's Magnavox mono radio/Phono chassis.
Their PP 6L6 O/P transformers had old Magnavox Logo of Lion
roaring from 1920's Hornspeaker ! Gave contoured logo a black
background for contrast.

I bet it'll sound sweet!

From what I recall of the schematic the audio output board of the TV chassis was completely populated and ready to drive a speaker they just never connected the speaker to the audio output transformer on the TV chassis(which feels like a waste of parts!) and instead ran a line from the first audio amp(or detector, but I'm pretty sure they picked it off soon after the volume control) and fed it to their own separate audio chassis which drove the speaker.

Most maggies had flyback failures because I doubt the factory dipped horizontal current. My T-933 was running around 225 ma when I got it running. I adjusted the efficiency coil and after two hours it still holds at 189 ma. The color circuit is RCA but with a couple of odd compactrons. The weak point on mine is the tuner! It is a turret but very cheaply made. It would not be a good OTA analog as the fine tuning is a bit quirkey!
A friend of mine had a Maggie roundie for years until a large picture fell from the wall behind it and broke the CRT neck. The chassis was the one with the BIG silver HV cage that had the HV rectifier mounted upside down in it.

I have a copy of the 1957 color tv buying guide and Magnavox has one set offered for $697.00. Although it was an RCA clone

Could you email a copy?

Mine is not done that way, no output transformer. The volume control is the one used for the stereo so they cant pick it off from there. maybe the older sets are that way without the stereo. All the parts to drive a speaker are not there on this chassis(C43).
As far as the chassis is concerned, it is RCA. All the same tubes and components. It's just modified in the audio output and power on/off controls. Flyback failures in this set are no more common than RCA sets.