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OK, so a little update with this radio:
I changed out the 5Z4 for a 5Y3G tube and installed a 6V6G tube into the radio and the hum has gone away, but a new issue as arisen, whenever I touch the chassis anywhere including the knobs or ground my signal generator to the chassis, the radio goes completely silent.
But then when I remove my hand or the signal generator ground clip from the chassis or from any of the knobs, the radio comes to life.
Is it because with this radio being made to utilize the metal tubes they had one of the heater pins grounded to the shield pin of those tubes and thus to the chassis?
If so should I go and unground those heater pins to make this radio work with more modern glass tubes?
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