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You can reduce the lamp surge and extend the life of the tubes with a CL-90 inrush current limiter. If you Google that you'll find a number of places to buy them. You may want to get several if you plan on restoring more radios. It installs in series with the power line: in the S-C set, an easy place would be to remove that wire that goes from the power switch to ground and install the CL-90 between the switch and chassis ground. It looks like a thick ceramic capacitor. It gets hot in use but heat is what makes it work. Because of the heat some thought needs to be given to mounting location but that spot in your radio is pretty open so would be fine.
It has a high resistance at turn-on and so limits the inrush current to the set. I've measured about 60 volts at turn on which slowly rises to just under line voltage in about 20 seconds, so it gives the tubes and lamp a soft start.
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Reece
Perfection is hard to reach with a screwdriver.
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