http://www.audioreview.com/reviews/blue-circle-audio-green-bc301fy-preamplifier Expert hi-fi audio reviews, blogs, home audio how to articles and news. Sat, 15 Feb 2014 17:41:40 +0000 hourly 1 http://wordpress.org/?v=3.8.3 http://www.audioreview.com/reviews/blue-circle-audio-green-bc301fy-preamplifier#comment-115 Fri, 17 Jul 2009 17:32:03 +0000 http://www.audioreview.com/reviews/?p=2491#comment-115 it appears average tubes can last between 5000 or even 10000 hours. but some last much longer. 25,000 hours or more. It appears to depend on the tube quality, and conditions of use. If you google “life span of a vacuum tube” you’ll find all kinds of results, along with some studies done by the IEEE.

]]> http://www.audioreview.com/reviews/blue-circle-audio-green-bc301fy-preamplifier#comment-114 Wed, 15 Jul 2009 21:28:01 +0000 http://www.audioreview.com/reviews/?p=2491#comment-114 How long before the individual vacuum tubes need to be replaced?

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