Hum noise following tubes

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iondb

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Hi there.  I am experiencing hum problems on the one channel of my tube amp. When I swap the output tubes from one channel to the other, the hummong noise follows that output tube set.

Is this a sign that it is time for replacement?  If so, it is probably a goo idea to replace the whole set?

The tubes are EL34 tubes on a Mars audio DIY amp:  http://sites.google.com/site/marskarel/
 

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