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Post subject: Silver face tube Champ noise
Posted: Fri Nov 23, 2007 5:06 pm
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Here's the dilemma,

I picked up a silver champ around 15 years ago I thought it would be a nice practice amp, however, when i got it home there was a scratchiness about the sound and it seemed to resolve itself when the pots were rotated vigorously for a moment or two. As the problem eventually worsened the amp became unusable and I would fire it up on occasion to see if it was possibly an electrical issue or static elec. etc.

At one point in time aprox. 1 year ago it kicked in so nice and we were even able to record it wide open and it was very usable for certain stuff.

Since then I relocated the amp to an entirely different location and let it sit for about a month and 1/2., and now the same problem is back.

What I observed is that the volume pot may have been replaced at one time since it is red and it is very scratchy, the rest of the pots aren't.

Also since the knobs have become excessively loose I am looking around for some (3X) to match My pre-CBS silver face with aluminum trim. No one seems to be able to order them and I haven't had any luck checking on line.


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Posted: Mon Nov 26, 2007 3:41 pm
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Old pots can be quite expensive. To get some, your best bet is eBay. Before you buy any, try spraying some contact cleaner (WD40 if you don't have anything else) in the pots you have and work them back and forth some. This will take care of a lot of noise usually. If you do replace the pots, just buy some new ones and don't throw the old ones away.


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Posted: Tue Nov 27, 2007 11:03 am
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Thanks allot for the tip hi-fi-guy.

So it seems that what your saying is that this is a common occurrence and that it is just a maintenance issue.

Is there any products other than WD-40 that would do a better job that is easily obtainable, and what is the proper procedure for applying the lubes?

Very much appreciate the help.


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Posted: Fri Nov 30, 2007 2:25 pm
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Last edited by tinker tech on Wed Jul 29, 2009 9:26 am, edited 1 time in total.

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Posted: Fri Nov 30, 2007 3:52 pm
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Thanks so far I used the WD-40, R-5, and changed the pre-amp tube, shot all the pots and am ready for some more suggestions.

The sound that it makes is like a fuzz tone and the decay breaks up unevenly, sort of jagged like.
I can definately hear the natural tone wants to bless me, so the spirit is strong but the heart is weak.

After looking under the hood I don't feel as intimidated as I first did, I just don't have any analytical type tools to work with so it's pretty much about replacing parts at this juncture but I am open to an experienced pros advice as far as the correct do it yourself procedures are concerned.

Any further sugestions please pitch 'em in. Thanks again


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Posted: Thu Dec 13, 2007 3:46 pm
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Are you sure the preamp tube you put in the amp is good? Try replacing all the tubes and see if that doesn't solve the problem. Visually inspect all of the electronics components inside the amp and see if any of them look burned. If any do, replace them. You could also replace the capacitors, but that will change the sound of the amp. However, this may be what it comes down to. Before you replace any of the capacitors inside the amp on the tag board, replace the filter capacitor (a large metal tube beside the vacuum tubes). Before you do replace any components, make sure you have discharged the filter capacitors. Even if the amp is unplugged and off, these caps can store a lethal electrical charge. Don't try replacing anything if you don't feel safe working on high voltage electrical equipment.


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Posted: Wed Jan 23, 2008 3:29 pm
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Well hello again and here is my latest update to this post.

As it turned out in spite of the fact that a speaker test tone was run on the amp using the proper equipment the speaker was the culprit, that was discovered after all other components tested out to be in good working order.

The final test on the speaker was to run a source straight in by-passing the internal chassis completely and low and behold the speaker coil was indeed failing.

Thank you all for your helpful suggestions.


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