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I would do it. I have an Air Castle farm set I need to do this for. Find a transformer and rectifier combination to supply a well-regulated source to the tube filaments in particular. Battery tubes use the filament as the cathode and ANY ripple on it will be amplified and objectionable for sure.
My experience with doing this on my Atwater Kent 30 showed that the B supply at 90 volts was easy. The heater supply was impossible to filter adequately so, I ended up getting a rechargeable sealed lead acid battery.
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"When resistors increase in value, they're worthless"
-Dave G
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