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That's interesting, I never saw such a large unit with single 50EH5 output tubes. My Dumont chassis may have been a higher-end unit. I have seen a small Catalina radio-phono console made by Arvin with single 25F5 tubes per channel for outputs.
On an RCA Lyceum TV B/W 22" table model I have, it uses the standard RCA portable B/W series string chassis with an isolation transformer for safety with external video/audio inputs/outputs and the metal case. Also I have an Airline multiplex adaptor which has a series string chassis but uses the isolation transformer as well for safety with the external connections.
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