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Post by tumeniamps (Tom) on Sept 24, 2022 7:25:08 GMT -7
Hi Guys, my friend blew his fuse on his Z-PLUS. I've encountered that on many amps and found many times the rectifier tube going bad can take out the fuse. I had him try a new rectifier tube and replace the fuse and there is still no power. Is there an internal fuse on a Z-Plus or is there anything I can look for. I know my way around amps fairly well. Thanks, Tom
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Post by Chilly Gibbons (Todd T.) on Sept 24, 2022 7:33:15 GMT -7
I don’t think Doc puts fuses inside the chassis like some other builders (like Marshall), but I haven’t been inside a Z chassis in years. I used to open them up when I was building home brews to see how it’s done, but like the Maytag Man, still waiting on the opportunity to service one.
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Post by tumeniamps (Tom) on Sept 24, 2022 7:36:29 GMT -7
I don’t think Doc puts fuses inside the chassis like some other builders (like Marshall), but I haven’t been inside a Z chassis in years. I used to open them up when I was building home brews to see how it’s done, but like the Maytag Man, still waiting on the opportunity to service one. Hey Todd, That's what I was thinking. I've been inside many of my Z's and don't remember ever seeing a fuse. Thanks for the response!
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Post by premiumplus (Dave) on Sept 24, 2022 7:58:33 GMT -7
Did you try pulling the output tubes and seeing if the fuse still blows? It's a process of elimination, but you already know that...just suggesting what I'd do next.
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Post by DRZ on Sept 24, 2022 8:05:51 GMT -7
I don’t think Doc puts fuses inside the chassis like some other builders (like Marshall), but I haven’t been inside a Z chassis in years. I used to open them up when I was building home brews to see how it’s done, but like the Maytag Man, still waiting on the opportunity to service one. Hey Todd, That's what I was thinking. I've been inside many of my Z's and don't remember ever seeing a fuse. Thanks for the response! No there isn't an internal fuse on any DR.Z amp so it's not that . Have your friend plug into the Effects return jack, you may need a slight boost to guitar signal via a boost pedal to get a decent signal level. Is there output now ? This cuts your amp in half for troubleshooting assistance. If it works issue is an early pre-amp tube , if not you still have a rectifier/phase inverter/output issue .
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Post by tumeniamps (Tom) on Sept 24, 2022 8:11:40 GMT -7
Hey Todd, That's what I was thinking. I've been inside many of my Z's and don't remember ever seeing a fuse. Thanks for the response! No there isn't an internal fuse on any DR.Z amp so it's not that . Have your friend plug into the Effects return jack, you may need a slight boost to guitar signal via a boost pedal to get a decent signal level. Is there output now ? This cuts your amp in half for troubleshooting assistance. If it works issue is an early pre-amp tube , if not you still have a rectifier/phase inverter/output issue . Hi Doc and thanks for the reply. The amp doesn't power up at all at the moment so I can't have him try plugging into the return.
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Post by purpletele on Sept 24, 2022 8:33:00 GMT -7
Hi Guys, my friend blew his fuse on his Z-PLUS. I've encountered that on many amps and found many times the rectifier tube going bad can take out the fuse. I had him try a new rectifier tube and replace the fuse and there is still no power. Is there an internal fuse on a Z-Plus or is there anything I can look for. I know my way around amps fairly well. Thanks, Tom I had a blown fuse issue on my Z-Plus and I went round and round and I eventually had Ben Fargen help me here in Sac. I also had a recommendation from Z to replace the rectifier with the recommended Shu Gang 5AR4 or a nice NOS Rectifier, utimately that was the key! There is a big jolt upon start up on that amp and the rectifier needs to be stout. We had actually proved the theory by installing a solid state (diode) rectifier. I have since removed the SS rectifier and installed a NOS Rectifier. There is also a chance that the power tubes were taken out in the original event. That was two years ago and I haven't had a problem since.
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Post by Chilly Gibbons (Todd T.) on Sept 24, 2022 9:44:31 GMT -7
If the neither the power indicator lamp or the tube filaments are lighting up, it has to be in the power supply. I’d first make sure the IEC power plug is securely seated into the amp. Then make sure the fuse is good by checking it with a multimeter set to continuity or by measuring resistance (should near zero). Also make sure the fuse is properly seated in the fuse holder. Then on to the rectifier.
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Post by tumeniamps (Tom) on Sept 24, 2022 9:54:28 GMT -7
If the neither the power indicator lamp or the tube filaments are lighting up, it has to be in the power supply. I’d first make sure the IEC power plug is securely seated into the amp. Then make sure the fuse is good by checking it with a multimeter set to continuity or by measuring resistance (should near zero). Also make sure the fuse is properly seated in the fuse holder. Then on to the rectifier. Hey Todd, I'm going to go over and check it out for myself. I don't like getting second hand info from him.
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Post by tumeniamps (Tom) on Sept 24, 2022 12:11:38 GMT -7
All fixed, bad rectifier tube as I suspected and he didn't seat the cap properly on the fuse after replacement. Thank you my Z brothers!
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Post by purpletele on Sept 24, 2022 12:38:00 GMT -7
All fixed, bad rectifier tube as I suspected and he didn't seat the cap properly on the fuse after replacement. Thank you my Z brothers! Sweet!
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