dparz
New Member
Posts: 4
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Post by dparz on Feb 26, 2016 13:30:50 GMT -7
My beloved vintage Green Diode Carmen Ghia head will play for 5 minutes then I get no Output - Lights still on, some humming but no output. It's like it warms up to a point then shuts down. Any troubleshooting ideas or anyone know what might cause this? |
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Post by John on Feb 26, 2016 13:40:29 GMT -7
Still have humming? That means it's not the fuse or the rec tube.
Most likely the power tubes. Pop a fresh set in and give it a try. (how old are the el84's that are in there?)
In cases like this, 99% it's the tubes...most likely the power tubes.
If a new set of power tubes doesn't do it....get another 12ax7, and put in in V1, and if that doesn't do it, put it in V2.
But like I said: probably need a new set of el84 tubes.
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Oh, I just re-read your post. This keeps happening over and over? Sounds like you've got a loose soldering point/joint somewhere.
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Post by premiumplus (Dave) on Feb 26, 2016 14:00:10 GMT -7
What John said. If it's not a tube, then I'd be suspicious of a fractured or cold solder joint or possibly a loose tube socket.
But like he said, it's 99% tubes.
How old is your Ghia?
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Post by "Z" Steve on Feb 26, 2016 14:05:23 GMT -7
Welcome to the forum. If new tubes do not correct the problem then it may need a Dr visit. Call or email the Z Shop.
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dparz
New Member
Posts: 4
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Post by dparz on Feb 26, 2016 14:37:33 GMT -7
Thanks for the replies and suggestions, will give them a try Amp has been re-tubed - but that was 8 years ago... Amp is from approx 2002 - don't have the Serial # handy |
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Post by zed on Feb 26, 2016 15:07:32 GMT -7
Retube the whole unit if they're that old.
More than likely, that's your issue.
Welcome to the forum and good luck on solving the problem.
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dparz
New Member
Posts: 4
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Post by dparz on Feb 26, 2016 17:48:34 GMT -7
Serial Number on my Ghia is K 7133 - which dates it to 2000 I think - bought from Willcutt Guitars
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Post by simpleton on Feb 26, 2016 18:05:14 GMT -7
Thanks for the replies and suggestions, will give them a try Amp has been re-tubed - but that was 8 years ago...Amp is from approx 2002 - don't have the Serial # handy  .....maybe it's time to do it again. Welcome in to the forum |
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Post by John on Feb 26, 2016 20:25:05 GMT -7
^^^^ This
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Post by LT on Feb 29, 2016 18:54:35 GMT -7
Welcome to the forum!
I know you're not blowing fuses, but when my Ghia popped its fuse, it ended up being a simple rectifier tube. Replace those old tubes and see what happens.
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dparz
New Member
Posts: 4
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Post by dparz on Mar 7, 2016 5:33:40 GMT -7
Ordered 2 matched JJ EL84's -- swapped the old power tubes out - fixed the issue...
Thanks everyone for the suggestions and debug tips!
Forgot how good new tubes sound - I guess your ears grow accustomed to the sound changes....
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.....maybe it's time to do it again. Welcome in to the forum
