I’m looking for an elegant solution to power an old radio with 220v dc

The bc-348 radio was powered by a dynamotor rated at 70ma @ 220V dc according to spec.
I have 120V AC on the house mains. I'm keeping the radio on DC power.
I have one schematic (attached) I'm looking at but that involves 2 transformers which I could work with but there has to be a way to get there with a switch mode power supply and bridge rect. Designing thats beyond my skillset.

Here is the outline for the solution for 2 transformers.
Transformers T1 and T2 are low-voltage
transformers with 120-volt primaries. They are
hooked up in reverse so that the high voltage
appears at the output. Use transformers with
12-volt, 2 amp secondaries for 12-volt operation; with 24-volt, 2 amp secondaries for 24-volt
operation

Hello
This type of solution does not generate a pure sinusoidal signal, but an almost square signal, with many harmonics.
You could use a voltage doubler, with two diodes and two capacitors.
Cheers
Giovanni

All you need is two mains transformers connected back to back.

So, for example, connect your 120Vac mains to a 120V to 12V mains transformer. Connect the 12V output of the transformer to the 18V "input" of a 240V to 18V mains transformer and take your output from the 240V winding of this transformer. This gives you 160Vrms AC. Put this through a full wave bridge rectifier and smooth the output with a 1000uF electrolytic and you have a 226Vdc supply. Don't forget to use suitably rated fuses in the primary and secondary.

In practice of course there will be power loss and subsequent voltage loss at the output, so the actual output might be of the order of 210 - 220Vdc. Having either or both of the transformers with several secondary taps would be useful in allowing you to compensate for losses experimentally.

The 12V transformer needs to be rated at least 15VA and the 18V transformer at least 20VA and preferably more for both. The wires connecting the transformers have to handle at least 1A. The second transformer needs to be a 240V type so that it can handle 160Vac, which would be pushing the limits of a 120Vac mains transformer.

The advantage of this circuit is that you have two layers of galvanic protection. You've effectively built yourself an isolating transformer.

Also, If you want to live dangerously (i.e. no isolation from the mains supply) you could use this chip: https://www.power.com/sites/default/files/product-docs/lnk302_304-306.pdf

With a 130k resistor for R1 in the example circuit in figure 5 and a 200R multiturn pot in series with a 910R resistor for R3 you have a variable output centred on roughly 220V output. Of course all the output components have to be rated for that output voltage.