Apparently your filament transformer is separate from other
transformers (plate).
I'd suggest running the AC line outside the amp and using a Variac.
The drawback to taps is your line voltage can vary with the season or
other factors and you'd be stuck.
As others have suggested, bring the filament connection out to a pair
of easily accessible banana jacks and you're all set for whatever
happens. Be sure to use an accurate meter such as a Fluke. This is not
an area to save a few bucks on a cheapie.
Used Variacs are widely available. Go first class!
73, Bill W6WRT
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