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Greetings from FixitLand!
Those under-chassis tubes remind me of my first set, a Motorola combo TV/radio/phono with TV chassis TS-401. It had a built-in UHF tuner, and the 6AF4 tube was mounted in a recessed hole in the front of the chassis, requiring removal of the chassis and much cursing to remove and replace that tube.
Are those tubes sitting on a sub-chassis? They're likely the mixer-oscillator and IF tube for the radio.
Take care,
--
J. E. Knox 'The Victor Freak'
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