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Old 03-15-2011, 10:21 AM - Thread Starter
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I thought I had a major problem with my tube amp. I was getting a crackling noise through my speakers Turns out, all it was that one of the power tubes was not seated correctly in its socket. Problem solved, sounds great. Hence, check tube seating every once in awhile
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Old 03-15-2011, 12:09 PM
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I've never had a tube move in it's socket on it's own yet.
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Old 03-15-2011, 12:26 PM
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The pins on tubes and the socket contacts can oxidize over time and temperature variations along with humidity can degrade the pin to socket contact.

Simply removing the tube and reseating wipes the surface of the contacts and can re-establish a solid electrical contact. I would suggest that a non abrasive liquid contact cleaner be used on the socket and a light wiping of tube pins with a Scotchbrite pad will further enhance the contact quality and remove more accumulated oxidation.
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Old 03-19-2011, 05:31 PM
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Quick questions since I just acquired Conrad-Johnson Classic pre-amp, do I need to worry about this one too? There are two miniature tube inside the chassis. Thanks.
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Old 03-19-2011, 05:42 PM
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If it's working fine, leave it alone. If it plays up, then do what Giz suggested. Course black (sandpapery feeling) erasers work well at brightening up pins, as do scrotchbrite pads.

I'm not a fan of removing/replacing tubes more than is necessary as sockets loosen with repeated use, and most people remove the tubes incorrectly which can affect the integrity of the seal between the pins and the envelope. Flexing PCBs during insertion/extraction can lead to cracking if they are not supported correctly.
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