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Post by nisaacs7 on Feb 19, 2014 5:51:40 GMT -7
I have a 2006 1x12 Carmen Ghia that is having a strange issue. Every now and then when I first turn the amp on, the volume seems to be stuck at around 9-11 o'clock even if I turn the volume down. It's not really that big of an issue because eventually it turns down. I'm just wondering what the problem is and if there is something that I need to watch out for or change?
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Post by nisaacs7 on Feb 19, 2014 5:59:32 GMT -7
Also, the reason I say it happens every now and then is because when I'm at my condo, I keep my amp volume around 9 o'clock and just barely roll my volume up to practice. Now that i think about it, there are a lot of times when I turn the amp on and it is hissing as if I turned it all the way up. This always makes me scratch my head and think it's my pedalboard, but now i'm thinking that when that happens, the amp's volume is much louder than I have it set.
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Post by bigsbybender on Feb 21, 2014 3:46:58 GMT -7
Make sure the set screw on the knob is snug.
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Post by BritInvasion on Feb 21, 2014 5:08:35 GMT -7
The volume pot may need cleaning or replacing,
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Post by nisaacs7 on Feb 21, 2014 6:01:16 GMT -7
I don't have anything to clean it with right now, but before getting to work I turned the volume up and down repeatedly to try and clean off the contact some and so far it's good. I should have thought about that. I kept turning it off and on as if it was a computer that was going to reboot.
I'll try to get some contact cleaner too, but for now it seems like working it back and forth will keep it cleaned out enough.
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Post by BritInvasion on Feb 21, 2014 7:27:38 GMT -7
That will work temporarily , but doing that is pushing the oxidation/dust particles/carbon dust to the ends of the pots electrical element. Sooner or later it will drag those contaminants back over the active electrical track. A good spray-out with Deoxit should do the trick.
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Post by nisaacs7 on Feb 21, 2014 10:37:17 GMT -7
That will work temporarily , but doing that is pushing the oxidation/dust particles/carbon dust to the ends of the pots electrical element. Sooner or later it will drag those contaminants back over the active electrical track. A good spray-out with Deoxit should do the trick. Do I need to just drop the amp chassis out and spray it from the back? |
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Post by BritInvasion on Feb 21, 2014 10:44:57 GMT -7
That's the best way , if you can get to the back of the pot and spray a short blast into any opening on the pot housing. Stewart-Macdonald sells a gizmo that attaches to the spray can on one end and the pot shaft/bushing ( on the front) to force the spray down thru the bushing/shaft area if the pot housing is sealed.
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Post by justblues on Feb 21, 2014 18:13:22 GMT -7
That's the best way , if you can get to the back of the pot and spray a short blast into any opening on the pot housing. Stewart-Macdonald sells a gizmo that attaches to the spray can on one end and the pot shaft/bushing ( on the front) to force the spray down thru the bushing/shaft area if the pot housing is sealed. Very cool. I have not seen that before. Thanks! |
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Post by nisaacs7 on Feb 23, 2014 7:22:59 GMT -7
So I realize my volume pot is shot! If you push it in it crackles and drops volume.
Any idea of what part to replace it with?
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Post by Ridgeback on Feb 23, 2014 9:46:55 GMT -7
I'm sure if you contact the Z folks, they could tell you.
Or, you could pull the pot, test it with an ohm meter (audio vs linear taper and resistance), and order a replacement. DO NOT mess with the innards unless you know what you are doing!!!! Death is not a fair price for a bad pot.
Or, take it to a tech.
Or, send it in to the Doc for a complete go over if you are close enough so shipping cost isn't big $$$ (combos are heavy). I understand they send them back better than new.
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Post by headshrinker (Marc) on Feb 23, 2014 10:43:14 GMT -7
Make sure the nut under the knob that holds the pot down is tight. Also if you are pushing it in hard and it's doing it, that may not be a bad pot. They aren't made to take a lot of force. If the nut is tight and it does it with a little pressure, then it may be. I'd be sure and spray it out before replacing.
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Post by randalp3000 on Feb 23, 2014 11:30:52 GMT -7
Make sure the nut under the knob that holds the pot down is tight. Also if you are pushing it in hard and it's doing it, that may not be a bad pot. They aren't made to take a lot of force. If the nut is tight and it does it with a little pressure, then it may be. I'd be sure and spray it out before replacing. Make sure the pot is not loose on the chassis. It might be grounded through its connection to the chassis. No ground, no control of volume. |
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Post by LT on Feb 23, 2014 15:44:08 GMT -7
Or, send it in to the Doc for a complete go over if you are close enough so shipping cost isn't big $$$ (combos are heavy). I understand they send them back better than new. ^^^ I recommend this. There are lethal voltages in tube amps. Send in only the chassis to save on shipping. I sent my Rem back to the Doc for a checkup when I bought it (used)…..well worth the $. |
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Post by nisaacs7 on Mar 1, 2014 19:20:03 GMT -7
Got a new volume pot, unsoldered the old one and when going to put the new one in I realize that the old one used was a Chinese pot with a smaller shaft. So now I have to go and get a step drill and widen the hole to fit the new pot.
Oh well the Ghia is most definitely worth it!
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