[Elecraft] Looking to build a better power supply from an old one

[NZ0T]

I have an old off brand linear power supply that is inop - it was a freebie. 
I would like to re-build it with a modern circuit as it was regulated with a
zener and I would prefer an ic based regulator.  The transformer is fine.  I
would like to find a circuit board I can populate with - parts.  I can build
a kit just fine but I'm lousy at breadboarding a circuit from a schematic. 
Does anyone know of a place I could find something like that for a 20 amp
regulated linear supply?

73 Bill NZ0T
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