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Post by jestes70 on Mar 11, 2009 13:14:05 GMT -7
So I got a new set of JJ tubes for my Maz 38. Put them all in and played one show with it, then it started popping and making sounds like it was quickly being shutoff and then turn back on. I took a pencil to the new power tubes and quickly found one, that when tapped caused the problem. I then put back in the original set of power tubes and could not get the problem to reoccur. I put the new power tubes back in this time with the suspect tube in a different socket. When I flipped the standby up I noticed the rectifier tube arc. I flipped the standby switch a few times and the rectifier kept arcing. I then went back to the suspect tube and tapped it and the noises were still there and I also noticed that somtimes when tapping the rectifier would arc. I'm pretty sure about the new power tube being bad but whats up with the rectifier tube? Is this normal? Did the bad power tube cause problems with the rec or vise versa? Thanks for any help you guys can give.
jeremiah
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Post by benttop (Steve) on Mar 11, 2009 14:19:04 GMT -7
A shorting power tube can cause all kinds of interrelated problems. The current supplying that power tube is coming from that rectifier tube, so yeah, you can expect this kind of behavior. The key thing is that if you give it enough chance, that bad power tube will make your recto bad too. Get it out of there and throw it away pronto!
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Post by jestes70 on Mar 11, 2009 14:43:28 GMT -7
Will do on the tube pull. Thanks for the advice.
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Post by Phil (aka Phil) on Mar 12, 2009 4:34:44 GMT -7
Ditto what Steve said. If it were me I'd replace both the bad EL84 and the rectifier. I've had power tube failures that took new production rectifiers with it... and I'll bet a NOS recto would have ridden through the fault. These newer ones just aren't built like the oldies.
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