Why not try a SMPS for preamp heaters?
This should do it, ca $20 from Mouser, can be adjusted to 12.6V on 1.2A load:
http://www.meanwell.com/search/NFM-15/default.htm
I haven't used SMPS to run heaters from (yet) but have seen it in some British custom amps.
12 volts DC from 6.3 heater tap
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Re: 12 volts DC from 6.3 heater tap
Aleksander Niemand
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Life's a party but you get invited only once...
affiliation:TUBEWONDER AMPS
Zagray!-review
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Life's a party but you get invited only once...
affiliation:TUBEWONDER AMPS
Zagray!-review
Re: 12 volts DC from 6.3 heater tap
I am in the 'why bother' camp. The 12a*7 tubes take will run off your 6V and cancel out the hum. I am thinking of doing the doubling and regulating to run 12V tubes but that is because I have no choice.