any thoughts/explanation on the power supply for this circuit?

[jarthel]

http://www.drtube.com/schematics/an/ankoru.gif

I guess I'm confused to the purpose of the 2nd 5R4.

thank you.

 

[sawreyrw]

The circuit is drawn a little strange, but both tube are used as half wave rectifiers. The outputs of them are in series.

 

[billr]

Hi

It's a voltage doubler using valves, that's all.

hope that helps.

BillR

 

[jarthel]

but both tube are used as half wave rectifiers.

now that you've mentioned, it is becoming clearer