I picked up a fully loaded Zenith Chancellor roundy combo

[DavGoodlin]

Nice deal even if it needs a universally-available CRT. A 7K31 amp is truly hard to find in anything, much less a combo! I have that TOTL record changer and same tuner in a 1963 MK-2635, a very common console HiFi.

Are you sure that chassis is 25MC43? If so this is a rare bird indeed. K-models were '63s so maybe the best SS amp for '65 was no match for that 7K31.
I have a 65 Zenith 25MC36 combo with a 25ABP22 and 140 "watt" stereo receiver that is all SS. No separate amp chassis either. If that SS receiver were in your combo instead, value would be half or even less with a busted CRT - LOL

Every Zenith with that earlier (TOTL for 1963) 12- tube tuner chassis I have found was paired with 3K31 amp, like one I have and others I did not buy for that reason. All seemed to have those better speakers though.

Zenith SE6BQ5 amps are not very powerful, yet do sound very sweet when all restored especially if you replace often cracked-looking ceramic disc caps with mylar film-dips. I bet that preamp and 7K31 amp chassis would rival a similar Fisher amp.