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wa1ise's idea is great - but I still like the idea of the seperate filament transformer best from a tube safety point of view, since it totally takes the CRT out of the possibility of ever getting more than 6.3 volts. You could hide the new transformer under the chassis too. And, to take up the 'slack' in the filament string, you could simply replace a 6SN7 with a 12SN7, or a 6SQ7 with a 12SQ7, etc. and not have to worry about a resistor added into the circuit.
-Ian
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