Thread: 6BK4 versus 6BK4C/6EL4A
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  #4  
Old 11-27-2007, 11:11 PM
3Guncolor 3Guncolor is offline
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Join Date: Mar 2005
Posts: 312
Back in the day I was told it was better to replace the older 6bk4 with the newer 6bk4c/6el4a for better xray protection. So I'd play it safe to use the newer tube myself can't hurt.
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