[Amps] AC to DC

[Rich]

I was at a hamfest today and checking out the relay setup in some amps.
The relays are no better in size that some 10amp relays I have. If I
remember some one noted the DC voltage that could be used on a 120V ac
coil relay. It this a feasible idea to use DC to reduce the chance of
hum being induced and what DC voltage should I use?
 
Rich, kd0zz