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Post by Dannydny on Jun 14, 2016 14:21:34 GMT -7
My ghia died on me the other day while I was playing it at a low volume. Suddenly it just faded out and it shut down. There was no power to the tubes at all. I pulled the rectifier and it looked ok. I took out the fuse and its still fine so I don't have a clue what it could be.
Anyone have any suggestions as to what it could be? Thanks in advanced for your responses.
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Post by Maddog on Jun 14, 2016 15:48:45 GMT -7
Did the pilot light die too, Danny?
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Post by Jaguarguy (Mike) on Jun 14, 2016 16:20:14 GMT -7
Here's the link to Doc's trouble shooting page - pretty easy to check. Also, just because a tube looks ok doesn't mean it is. Sounds like you might have blown a fuse if there is no power - but something usually cause the fuse to blow so follow Doc's procedure and it'll come to life quickly. drzamps.com/info/faq-troubleshoot/ |
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Post by John on Jun 14, 2016 16:55:10 GMT -7
just because a tube looks ok doesn't mean it is. Sounds like you might have blown a fuse if there is no power Yeah....visual observation of a non powered up rec tube is not a good thing. It won't tell you anything. I've had my Ghia do the same thing. By far, most likely is: 1) burnt fuse (even though it can still look good) 2) Bad rec tube. And a burnt rec tube can take out a fuse. And vice versa. And while you're at it, I'd change the power tubes too. |
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Post by Dannydny on Jun 15, 2016 4:55:48 GMT -7
Did the pilot light die too, Danny? yes Lee.... the pilot light is out.... there is no power at all? |
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Post by Dannydny on Jun 15, 2016 4:57:03 GMT -7
Did the pilot light die too, Danny? yes Lee.... the pilot light is out.... there is no power at all? John... did your Ghia loose total power from a bad rectifier tube? |
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Post by Maddog on Jun 15, 2016 5:03:14 GMT -7
I'm agreeing with the above here, Danny. Even tho the fuse looks good, it might be bad. That will kill everything. If it just failed, easy fix: replace it. But usually, something else failed and a power surge blew it. Likely a rectifier tube. Do you have a multimeter? Can you check the fuse for continuity?
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Post by John on Jun 15, 2016 5:41:47 GMT -7
I'm not sure what happened first...rec tube or fuse. But which ever one went first, it took out the other. And in addition, it broke the glass of an el84.
Although it could be said that if the el84 broke it's glass, that could have zapped the circuit enough to take out the fuse and rec tube.
------------------------------------
New fuse
New Rec tube
New el84
Then if nothing goes wrong, I'd put the old rec tube back in to see if it works. If it does, then you've got a back up. (rec tubes usually either work or don't....there's no middle ground)
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Post by Dannydny on Jun 24, 2016 8:58:49 GMT -7
I finally got around to ordering a NOS Jan Phillips rectifier tube from Mike at KCA Tubes... Hopefully that with a new fuse and I'll be up and running again soon... will let ya know the results!!!!
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Post by sonicboom on Jun 24, 2016 9:15:15 GMT -7
When I bought a brand new Anniversary Ghia from Humbucker Music. It arrived here, I plugged it played like 4 practices with my band and it suddenly turned off just like yours. I was mad and I thought the worse happened. The guys from humbucker told me to replace the rectifier tube. I bought two jj rectifiers and since then I've used the ghia for a lot of gigs and practices that last 3 hours without any problem at all. I always carry the a spare rectifier just in case. Its the only tube I have ever seen failing.
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Ghia Died
Jun 24, 2016 18:23:37 GMT -7
via mobile
Post by ss "Shane" on Jun 24, 2016 18:23:37 GMT -7
I'm a new CG owner so this is good to know.
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Post by j4gitr (John) on Jun 24, 2016 21:16:26 GMT -7
Had an occurrence similar to yours with my antidote. New rectifier from kca and a fuse and all was back to normal.
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Post by premiumplus (Dave) on Jun 25, 2016 7:26:49 GMT -7
Tubes are the number one failure component in tube amps! Always carry spare fuses and tubes, and always realize that a blown fuse is 99% of the time pointing to a shorted or failed tube.
I never ever go out with a tube amp without spare fuses and tubes. And a cheap DVM to check continuity of fuses and cables.
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Post by Dannydny on Jun 25, 2016 13:50:54 GMT -7
I put in the NOS Rectifier tube and a 250v 1amp fuse and the amp worked but the fuse blew? Does anyone know if a 1amp fuse is right? I'm thinking it may not be right?
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Post by j4gitr (John) on Jun 25, 2016 14:12:19 GMT -7
I amp fuse is what is called for. I'm betting power tubes are to blame, but refer to Mike's post above and follow Doc's link to the trouble shooting page. It has always worked for me.
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Post by zed on Jun 25, 2016 15:04:58 GMT -7
I changed all of my tubes (along with the fuse) when I had this issue with my CG, worked fine after.
When I pulled the other tubes, there was at least one that sounded like a burnt light bulb when shaken.
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Post by KeithA on Jun 25, 2016 15:43:09 GMT -7
I put in the NOS Rectifier tube and a 250v 1amp fuse and the amp worked but the fuse blew? Does anyone know if a 1amp fuse is right? I'm thinking it may not be right? Was it slo-blow or fast blow (the fuse)? |
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Post by Dannydny on Jun 25, 2016 17:21:57 GMT -7
I put in the NOS Rectifier tube and a 250v 1amp fuse and the amp worked but the fuse blew? Does anyone know if a 1amp fuse is right? I'm thinking it may not be right? Was it slo-blow or fast blow (the fuse)? I'm not sure... I turned the amp on for a few seconds then shut it off... Then tried turning on again and the fuse blew? |
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Ghia Died
Jun 25, 2016 18:21:49 GMT -7
via mobile
Post by Jaguarguy (Mike) on Jun 25, 2016 18:21:49 GMT -7
Was it slo-blow or fast blow (the fuse)? I'm not sure... I turned the amp on for a few seconds then shut it off... Then tried turning on again and the fuse blew? Should be a slo-blow fuse |
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Post by Dannydny on Jun 26, 2016 10:09:54 GMT -7
I'm not sure... I turned the amp on for a few seconds then shut it off... Then tried turning on again and the fuse blew? Should be a slo-blow fuse That was the trick Mike... I ran over to Home Depot and grabbed a slo-blow fuse and now everything seems to be working fine! Thanks everyone for you 2 cents and support  |
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Post by LT on Jun 26, 2016 14:34:57 GMT -7
Same thing happened to my Ghia. Bad rec tube and blown fuse. I also learned the hard way that the fuse has to be slo-blow. It's run fine ever since.
I agree with John in that now might be a good time to change out the power tubes.
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Post by premiumplus (Dave) on Jun 28, 2016 6:52:43 GMT -7
Rule of thumb: Tube amps use slo-blo fuses, solid state use normal, fast response fuses.
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