massive volume fluctuations--bad tube?

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I've been experiencing massive volume fluctuations in my setup and have attributed it to my Level 1 modified Jolida 102B (have tried three sets of different speakers and two cdps). At some points, where there should be female vocals present, I hear nothing but the bass line. At other times, the volume completely drops and then goes back up.
This is my first tube amp and am assuming it's a bad tube? Is there any way to tell whether the tube is bad? I just re-biased the amp and the multimeter indicated that the required volts were present..
thanks
ps...I'm also using extremely efficient Omega speakers so I know it's not an issue of lask of power

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Topic - massive volume fluctuations--bad tube? - nj_z@yahoo.com 06:01:07 10/08/04 (1)

Re: massive volume fluctuations--bad tube? - steven oda 16:58:35 10/08/04 (0)

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