That old Stancor looks fantastic for almost any radio, for a TV you need about 300 watts and color TV 400 watts minimum.
I found this Halldorson 500 VA with tap switches. I still use an oversized powerstat that was liberated from a theatrical lighting dimmer, in line before it rather than risk a mechanical failure of the switches, which are buried inside. The meter is pretty worthless accuracy wise.
Halldorson-variable-Transformer-.jpg