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Yes, they do (except for the filament voltage; can be either / or) however, the DC voltage levels needed to power large transmitting tubes are hard (if not impossible) to achieve with DC to DC conversion.
For example, a GU-39b-1 needs 6.3 volts at better than 100 amps to light the tube, 10,000 volts on the anode and, the control and screen grids need -70 volts and a +400 volts respectively; these are voltage levels that are best achieved using 120 volt AC input.
AC mobiles use inverters to provide 120 volts to light the tube and minor supplies and a 3 phase alternator driven power supply to generate the B+ for the anode (plate) of the tubes.
Please advise me to what is a good replacement mic for my SR-497HPC... Answer: 497 is "wired like Cobra", so many choices available. That radio does not need a power mic, so purchase a stock "coffin style" mic with a decent cord, like the ones that Astatic uses. The Superstar DM-507 is my go-to. https://www.ebay.com/itm/3050474478...adANq91JSiEEnz8EGqPJRBloTgEyaVsBoCtoMQAvD_BwE $12.99 + .99 cent shipping.
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