> Hope someone comes up with some voltages and currents ...

Current is the more important factor, not voltage, although some
consideration must be given to the electrodes' and the silver's
relative positions in the electrochemical series. As Alan says his
father used stainless steel electrodes with silver then you can
take it that method will work for you too

An electroplating bath may have 2.5VDC across it, measured
as amps per sq cm. That assumes an E.P. solution optimised
chemically for good throwing (ie deposition efficiency) power

4g of silver is deposited by 1 amp-hour. What you'll need to do
is use a PSU set to 2.5V and adjust the current for whatever it
is you want across the solution to deposit the silver content you
estimate is in the photographic solution in a reasonable time

The actual amount of power going into your solution will depend
on the separation of the electrodes and thus the resistance of
the liquid between them, as well as impurities that impede the
deposition process. Using a copper electrode may help, as the
copper will replace the silver that comes out of solution, so
keeping the conductivity of the solution up

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