Vintage Synth Repair

hi, i just joined this group because i just came
across a wurlitzer 200a.  i got it home and the
original cable didn't
come with it so my friend removed the original oval
three prong connector and wired an extension cord to
it.  i turned it on and it worked, the keys worked and
the vibrato did too, it was a little static-y but not
bad.  then it was left on for a little while, i came
back to it and the keys wouldn't make any sound.  the
speakers still work and i can hear the vibrato pumping
and the volume sizzle softens as i lower the level,
but the keys still aren't amplified.  i thought maybe
it was a problem with the power cable so i connected a
iec connector to it but it's still the same.  does
anyone have any idea what this could be?  please let
me know what i should do if you get the chance. 
thanks!

troy 


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