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As far as I know this Zenith set does not use a rectifier tube...it uses a selenium rectifier. The dial lamp/indicator lamp is either a neon lamp, or it is a 28 volt bulb that operates with a dropping resistor directly off the 110 volt ac powerline.
Most of the time the selenium rectifier will operate OK...but it will deteriorate over time and possibly short out. A good replacement is a 1000 PIV at least 1-amp silicon diode with a 100 ohm 10-watt resistor in series with it to limit surge current at turn-on and to keep the voltage at the same output level as the selenium.
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