• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

heater voltage

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I tried what you're thinking with a couple of current hog 5687s. What I didn't figure on was the more than 1v forward current drop in the big bridge rectifier that more than ate up all the p-p benefit I was hoping to get. Sorry, won't work.
It IS ok to suck a little more than rated current from a heater winding of a p trans if you're not using another of the windings, like the 5v rectifier heater winding.
 
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