Oisin
763 posts
Feb 26, 2011
5:55 AM
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My Fender champion 600 has developed a hum when I turn it on. It gets louder as volume is increased. Is this a sign one of the tubes are going?
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Oisin
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barbequebob
1577 posts
Feb 26, 2011
6:54 AM
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It may not necessarily be the tubes because that sounds more like a 60hz hum and can easily be something else, and with amps made before they used grounded plugs, it can be a polarity problem.
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Sincerely,
Barbeque Bob Maglinte
Boston, MA
http://www.barbequebob.com
CD available at http://www.cdbaby.com/cd/bbmaglinte
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jim
743 posts
Feb 26, 2011
7:00 AM
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sometimes I have it if I plug the amp into the same outlet as the electric heater
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Last Edited by on Feb 26, 2011 7:00 AM
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Stevelegh
71 posts
Feb 26, 2011
8:02 AM
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Apparently it's a common problem. There's a guy called Alnicomagnet who sells a mod kit on Ebay
http://cgi.ebay.co.uk/Alnicomagnet-Mod-Kit-5E1-5F1-Champion-600-Gretsch-G5222-/360329185369
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tmf714
508 posts
Feb 26, 2011
8:41 AM
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Most of the hum comes from the heater wires-they pass directly over some high-impedence areas of the circuit. If they are too short to be led away from the circuit,you may have to extend the wires-that would be the hardest part of the fix,if you had to do that.
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Oisin
764 posts
Feb 26, 2011
12:37 PM
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Well the amp was running fine for about 2 years with no hum but it's only in the last few days that the hum has started. So would changing the tubes not effect the hum? I love this amp and just want to get it back to normal. I'm a bit wary about turning it on in case I do any damage.
Oisin
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tmf714
510 posts
Feb 26, 2011
12:44 PM
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If it's easy enough,you may replace the pre-amp tubes with known to be good tubes. I'm would not say you can rule out the tubes as one source of hum.
Last Edited by on Feb 26, 2011 12:44 PM
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