WZ68 Rectifier Blown?

Just blew a fuse on my st-120. When I went to pull rectifier, the cap slipped right off. Not seeing anything obviously blown. Is there a way to test the WZ68 to see if it is what caused the fuse to blow?

Thanks for the help.

I've heard of the cap coming off and the rectifier working fine. It's apparently just glued on, and the heat loosens it up.

Easiest test would be to put in a spare and see if the fuse blows again.

Make sure you re-tension the socket while you're at it. Loose connections sink ships, or something like that.

Thanks, just ordered a new Weber, if it blows the fuse I will have a back up now and will start over on trying to diagnose the problem. Thanks again

Same thing happened to me last week when I changed back to tube rectification I doubt the copper cap is bad.

when the gz34 breaks(again) in my vta70 i think i will mount 2 1n4007 diodes and forget about
tube rectifiers. Until then i'll be lazy and keep the music flowing.
But that's me, ymmw

I've had Webers with loose cans; they'll run fine (and considerably cooler) without 'em on at all, but that exposes some pretty high voltages
One of many other things that will blow a fuse -- and sometimes take a rectifier with it -- is a red-plate event in one of your output tubes. I had a low-time KT-88 go south on me last week when the screen and control grids (pins 4 and 5) shorted to each other. Nice fireworks; the fuse put a stop to the nonsense and somehow the rectifier survived.
The Webers work pretty hard in a Dynaco power supply and heat is their enemy. TMadden on this board has some inexpensive mods you (or he) can do to them that will beef up their current capacity and let them run cooler.

I was out of the room when the fuse blew, but did not see any signs of distress in the outputs. Was going on almost 4 years of daily use and frequent high volume, so hopefully just the rectifier. If there is a test, would love to check it, otherwise new Weber will be here this week.

nathico wrote:I was out of the room when the fuse blew, but did not see any signs of distress in the outputs.  Was going on almost 4 years of daily use and frequent high volume, so hopefully just the rectifier.  If there is a test, would love to check it, otherwise new Weber will be here this week.

My blown KT-88 shows no physical signs of blowing; getter flashing is still pretty and there's nothing weird-looking inside. Fortunately I was in the room when things went pear-shaped. Looks can be deceiving.

Thanks, went ahead and checked connectivity, no shorts in the power tubes, runt kt-120. Checked all pins , only connective between 2 & 7 on all. Course does not mean something else is not wrong. Thanks for the tip on checking them.

Four years of steady use on the new generation of power tubes and the Webers is gettin' your money's worth.