[GreenKeys] An actual Teletype question :-)

[Rokumon Cat]

Hi again,
 
Does anyone know where I can find a simple, tube only circuit for a local loop power supply using something like a 5Y3? I need to build four of them in a rack mount for my TTY display set up. 
 
I have found many designs for solid state rectifiers that would work quite well, but the point of my demo is to use only tubes so that I will have an EMP hardened display using 1950s and early 1960s technology.
 
Thank you again,
 
Joe
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