That transceiver mentioned earlier:
https://www.ebay.com/itm/365711599836 contains the B&W phase shift network that was used for early SSB transmitter balanced modulators and has a single crystal in the right rear that is probably the carrier oscillator. I did not see the SSB filter, but it may be in the aluminum box underneath. It also looks like it is multiband. The 1960's era ARRL SSB for Radio Amateurs had some great SSB rigs that could be homebrewed back then. I always thought one of the neatest idea was from the fellow who tapped 3 leads off the anode side of the rectifiers of his car alternator, fed the voltage to the 10 V secondaries of a , 230 volt primary filament transformers, and hooked them up 3 phase fashion to get 700 volts for his mobile rigs plate supply. Think the XFMRS were milsurp 50-400Hz units, and even though it was high freq AC it apparently worked quite well.