[Amps] dc power supply

[W5JMW]

I need some guidance.I have never been good with the regulated 12vdc 
supplies.I guess if I can't use a hi-voltage probe and can,t see whats going 
on I am lost.My question to the group.I have a cubic psu-6a.It is a 12 vdc 
supply for the 103.It has 24 vdc output and blew the fuses as it should have 
done.I checked the pass transistors and there is 24 vdc there.Also on the 
solid state bridge.Is the regulator transistor bad? That seem logical.But 
cac a regulator do this,just open up and allow what I guess is max 
output..Thanks in advance,no I dont have a print..73 john