Yet another radio mod, this one I doubt anyone would replicate. At my mom's house there is this 8/16VAC 5A power bus, using the old 0.635cm Jones plugs. Why these voltages? It dates back from the time we had a model railroad setup, and the lights in it used 8V. I have a few 4BE6's and 4AV6's, and a small 17V centertap transformer I could wire backwards to get the plate voltage. The rectifier became made of sand, and the 50C5 became a submini 5902. And the 12BA6 changed to a 6BA6, and a small 2 ohm heater dropping resistor. The B+ came out a little low, around 90VDC, but the radio still works well. I did "stack" the bridge rectifier circuit atop the rectified otherwise unused portion of the old centertapped secondary to get an extra 16VDC to make it total the 90VDC under load.

It must be awesome to decide you want to do that work, and then do it!
Nice

I find your use of the series filament tubes in the set quite a novel, (and great) idea. This is a good way to use up some of the really cheap "popcorn" types of tubes.

In the AC/DC radios I am often replacing the 35C5 & 35L6 tubes with 50L6 & 50C5's; as the line viltages here in the USA have gone up from 110VAC to 125VAC in many places

While I was experimenting, I have used as low as 6VDC on the plates of some of the tube radios I have built, with excellent success.