On the Astron 50 power supply, blowing of fuse may indicated bad MOV's
on input AC line; temporarily cut one leg of each one, and test fuse
surviving after power up.
Or, it could be one or more diodes in bridge rectifiers. I think the 50
model is the one that uses half a bridge as a full wave rectifier, so it
may be confusing first time you examine such a circuit.
Finally blowing line fuses could be a pass transistor failure or output
capacitor failures.
GL,
Stuart Rohre
K5KVH
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