[R-390] Blown B+ Fuse - Cont'd

[Flowertime01 at wmconnect.com]

Barry,

First thought on this is a tube doing an internal short.
Something flaked inside a tube and gives you an over current.
So you bumped the receiver around and now it behaves.

The 1/8 amp is out after the filter supply caps.
So it looks like a by pass cap in the RF- IF B+ line.
And the switched RF-IF B+ Line.

If the receiver is still killing 1/8 amp fuses, put the tubes in the tester 
and
smack them around a bit. In the past blown fuses were bad tubes.
If you have this receiver all recapped, I would expect a tube is erratic.

Second though on this is a poor cap.
It looks to have reformed its self for the time being.
If you keep the voltage on and carefully watch the critter it looks like it 
will
behave. If you let the receiver cool for a few days, the problem could 
reappear.
But a tube will do the same thing to you.

It may not be the cap per say. It could be a left over grim or condensation 
problem.
Two much current leaking off a wire to ground. Just as hard to find as a 
marginal tube or cap.

Roger KC6TRU