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Several years ago, I built a 90V/1.5V power supply, using two 12.6 volt transformers wired back-to-back. These transformers were from rat shack and were reasonable at the time. For the filament supply, I used a standard bridge rectifier and filter circuit feeding an LM317 adjustable voltage regulator IC. For the B+, I used a standard bridge rectifier and PI type filter network. I didn't add any type of voltage regulation for the B+; but, you could add some zener diodes in order to keep the B+ at the required level.
Obviously, the advantage of a solid state power supply is the voltage regulation; which, is really not there on the older battery eliminators from the '40's and '50's.
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