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Should not be too hard to rig something up for a temporary test, that is if the filament string is still even suspect.
1 amp isolation transformer → bridge rectifier → filter caps → power resistor if needed, and bring up on variac until heaters are at optimum range.
Any large power x-fomer should work as long as it has dual primary, example, I did not have a isolation transformer when working on the RCA radio, but made one out of an old stancor p-6378 transformer.
The dual primaries were more than it's 8 tubes & the radio w/o even getting hardly warm.
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