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Post by zone47 on Mar 31, 2007 3:43:26 GMT -7
.... it shut down without warning Lucky thing I was jammin in my living room and not on stage No power light ..... everything is down. The 115V power source is still on. I'll look at the fuses and hope it's something simple
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Post by zone47 on Mar 31, 2007 5:48:45 GMT -7
Well, something took the 3 amp fuse out to lunch. I suspect a tube shorted out or ?? I'll have to test the tubes on my Mercury 2000 and see what's up.
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Post by jwr on Mar 31, 2007 9:42:10 GMT -7
Check the rectifier tube.
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Post by Curt on Mar 31, 2007 11:29:40 GMT -7
Yep, either the rec or secondly a power tube.
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Post by zone47 on Mar 31, 2007 16:14:41 GMT -7
Well, it's kind of weird.... I pulled all the tubes and checked them all out. None of them showed a short, but just to be on the safe side I swapped out the Rectifier tube for another one. Plugged in a new 3A fuse and it powered up and is working fine. I wonder if a tube can short for a second ...long enough to pop a fuse?? When the fuse went I was only cranking the volume to about the 9 oclock position, so it wasn't really pushing it at all. Oh, well, I'll have to play it for a while and see if it works ok before the next gig.
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Post by prsnstrat on Mar 31, 2007 22:46:08 GMT -7
I had the same problem with a z-28 and replacing the fuse and rec tube did the trick!
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Post by zone47 on Apr 1, 2007 7:54:14 GMT -7
I had the same problem with a z-28 and replacing the fuse and rec tube did the trick! Thats good to know. The tube I pulled out of there was a Sovtek which just happens to be the only brand I've ever had mulitiple problems with.
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Post by Curt on Apr 1, 2007 8:29:11 GMT -7
Replacing the Sovtek Rec with an NOS is the one upgrade I would recommend on a Z amp.
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Post by janinedoubly on May 16, 2007 14:54:43 GMT -7
I second that...Find an NOS or even a used, but good, Mullard GZ34. Best money you'll spend on a rectifier tube. It should last for another millenium.
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Post by evildoc on May 21, 2007 7:52:35 GMT -7
Power spikes can do it...or a short somewhere in the amp...
But if was just a situation of turning off the amp and coming back the next day and 'poof' it's dead with a snapped fuse....it's almost always the recto tube. Thats the beauty of tube recto'ed amps, those wonderful little glass bottles offer a layer of protection...
Granted, I've never had a diode snap on me...and I can't remember if they're supposed to stroke-out open or closed...but if they stroke-out closed, you could find yourself in a situation where the rest of the amp gets put at risk.
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