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Tube Preamp L&R Channel different current draw

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tube cadet

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Joined 2007
Tube Preamp L&R Channel different current draw

Hi,
I need to determine why the left channel of my phono tube pre-amp is drawing 15 ma while the right channel is drawing 10 ma. I assume the left channel is at fault since there is also some hum on the left channel. I assume the problem is either a tube or a bad electrolytic capacitor. I guess I could swap L and R tubes to determine if the problem follows the tubes but not so easy on my pre-amp. Any suggestions on what I should look for and how to test capacitor in circuit would be greatly appreciated. The pre-amp has separated B+ supply which are at the same voltage.
Thanks.
 
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