I'm looking at a motor-generator set for possible use on a Tel-Electric
brass roll piano player.  The DC output is 12 volts at 14 amps.  But
the Tel-Electric requires 14 to 15 volts.  Is there a way to increase
the output voltage without rewinding the coils?  The amperes don't need
to be 14 and a decrease to 10 amps is fine.

Thanks
Dave Krall