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Welcome to the forum!
This is obviously a TRF (Tuned Radio Frequency) set, not a superhetrodyne.
This means that all amplification before demodulation is done at the carrier
frequency, with tuned circuits coupling the stages. This can be assumed from
the 4-gang (4 sets of plates) tuning capacitor. The first thing is to get
a schematic, identify the missing tubes, etc. Don't ever plug it in until
some checks have been done (if you did, just don't do it again). See you later.
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