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Probably not wise to run the filaments directly from the cars power due to the fact that it's at least 13.8 volts and higher when cold. Filaments wont be too happy. A regulated PS would be in order. B+ is 375V for the 7591's plus 200V+ and 160V for the others. The 12ax7's are already run in series in that receiver, However the rest are not. The current draw for that receiver is 3A max.. Removing the FM tuner and phono preamp tubes will raise the B+ voltages and is not advised without modification. Maybe just sell it on eBay. You'll get more than $200 for it easily and buy something better.
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