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GE 6CA7 - Can't bias tube low enough

Just got some slightly used GE 6CA7 and they do sound wonderfull in my CJ CAV 50. Only problem I have is that one tube can't be biased low enough. The biasing on the CAV 50 is done by turning the bias up, until a red LED comes on, than turn it down again, until it goes off. However, I have the bias settings of all 6CA7 much lower than on EL34's. And one of the 6CA7 actually can not be biased low enough for the LED to go off. Though sometimes after warm up it may go off, properly also depending on the slight ups and downs of the mains voltage.

Any opions or suggestion?

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Topic - GE 6CA7 - Can't bias tube low enough - Capt. Z 04:56:47 04/12/07 (15)
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