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Post by jatmosphere on May 13, 2006 10:33:59 GMT -7
found a weird thing today when i opened up my CG today for the 1st time? (bought the amp used on-line from dewman last month). was putting in a Mazda 5y3 and had to take a look inside while i was there... so there it was: a big orange cap attached to the el84 on the left w/ one lug connected to pin #7 and the other in the air? then there is the white rectangular thingy (XICON 5W 10K J - conjunctive filter?) not attracted to anything, just laying on the yellow (pin#3 and orange wires (pin#9, both slightly melted) that are connected to the same power tube socket?? went to www.proguitars.de site to look @ the stock close up pic: www.proguitar.de/ProGuitarPreisliste/Amps/AmpPreisliste.html. and, there's no big orange cap there, and the white thingy was there but could not see where it was attached in the picture. i've taken a picture of mine, but didn't know how to post it here. any help would be muchly appreciated. please contact me and i can send you my picture. the amp still sounds great, but i just want to make sure it's cool and try to hear/make her stock (if she ain't?). i've already drained the caps and just wondering what's next...?? thanks so much, John %^)>
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Post by billyguitar on May 13, 2006 11:24:29 GMT -7
Mine was like that too. I soldered the legs or the resistor and the cap together. Sounds better now. On mine I could see that those legs had just been soldered together parallel to each other. Solder isn't glue, those legs should be twisted together then soldered. See the thread I had about "Conjunctive filter is a good thing".
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Post by jatmosphere on May 13, 2006 11:53:20 GMT -7
i've read your other post a few times now. what do you mean that you soldiered the legs together? both ends soldiered parallel so that they are only connected to the #7 lug on the left power tube only? or does the white resistor's other leg go some where else?? thanks...
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Post by billyguitar on May 13, 2006 22:41:37 GMT -7
answered your PM by PM.
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Post by StrangeC on May 14, 2006 20:51:08 GMT -7
Is this common? Should I check mine?
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Post by jatmosphere on May 14, 2006 21:26:37 GMT -7
kind of seems to be? it's easy to see if it's not right. you can check yours against this close-up shot from www.guitarpro.de - www.proguitar.de/ProGuitarPreisliste/Amps/AmpPreisliste.html. it's the fat orange drop cap (partially under the circuit board) and the big white resistor between the power tubes. I gave Z the s#, and the good doc sent me the cure. he said that it was caused by a failed output tube, that happened to the previous owner who replaced the tube, but didn't check the c filter... from the doc - "It's a .0022 uF cap 600Volts or higher and a 5 watt 10K resistor wired in Series from pin 7 of socket 4 to pin 7 of socket 3 , EL-84 plates. Twist leads a little better, don't use old parts, solder well". seems like the achilles heel of this amp? a quick fix and it'll be off and running again soon! the amp still sounds awesome. I actually don't know what she truly sounds like yet?! can't wait to give her the fix and check out the real deal! peace JC %^)>
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dewman
Junior Member
Posts: 86
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Post by dewman on May 15, 2006 21:10:04 GMT -7
Hey John, For the record, I never opened up the amp and never modded it in any way and never had any tube-related failures of the CF circuit causing it to open up. I bought it used from a Gear Page guy by the handle 'paddywhack'. I just dropped out the old set of power tubes, added the JAN 5Y3 , the JJ EL84s and the 12AX7s and went at it. Obviously I never would have sold anything in that condition and am happy to cover parts for the repair that you are doing. Email me and I can give you paddywhack's contact info of you want to see if he was the one that had performance issues w/ respect to the power tube failure. Send me an email (regular email) if you want to chat further. All the best,
Dewman
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dewman
Junior Member
Posts: 86
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Post by dewman on May 15, 2006 22:15:37 GMT -7
Ahh...read the other conj. filter post and am now more informed. Thanks guys...seems like a common problem.
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Post by Curt on May 16, 2006 12:45:04 GMT -7
I too wonder if Mine/Billy's was knocked loose when I shipped to him or if it had been loose the whole time I owned/gigged it...Hmmmmmm?!?!?!?
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Post by jatmosphere on May 16, 2006 13:06:46 GMT -7
did you ever have a failed output tube? that's what the doc said caused the cf in my amp to break apart b4 i owned it. actually happened to the guy who owned it b4 dewman did. so he never really heard the ghia in all the time he owned her?! man, what a sound...! ;D (sorry dewey). feel free to come to Brooklyn for visitation rights anytime!
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dewman
Junior Member
Posts: 86
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Post by dewman on May 16, 2006 14:00:48 GMT -7
oh hell...now I wish I had opened her up...bet she sounds sweet...got my eye on another Z purchase now though...thanks for the offer of visitation rights...next time we visit our friend in Brooklyn, I'll look you up!
See ya, D
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Post by billyguitar on May 16, 2006 14:19:39 GMT -7
The difference is not huge. Just a little less gain and smoother after the repair, oh and not quite so bright. I would not go back, though.
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Post by jatmosphere on May 16, 2006 16:00:09 GMT -7
funny thing is... mine's brighter now than before fixing the cf?! but much SWEETNESS has been added too. yo D, holler @ me next time you come to town for sure. peace JC %^)> ps - what Z is next for you?
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Post by guitarboy02451 on May 21, 2006 14:56:45 GMT -7
so, is this a concern on brand new ghias?
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Post by billyguitar on May 21, 2006 15:34:25 GMT -7
Probably not. Easy to check if you want to look inside. Just look on top of the output tubes. If nothing is loose then you're good.
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