Comments on: On average, how long do power tubes last in a tube amplifier? http://audiograveyard.info/pro-audio/on-average-how-long-do-power-tubes-last-in-a-tube-amplifier-2 All About vintage pro audio Fri, 20 Jul 2012 18:26:39 +0000 hourly 1 http://wordpress.org/?v=3.3.2 By: ROBERT P http://audiograveyard.info/pro-audio/on-average-how-long-do-power-tubes-last-in-a-tube-amplifier-2#comment-1785 ROBERT P Thu, 04 Mar 2010 21:35:43 +0000 http://audiograveyard.info/uncategorized/on-average-how-long-do-power-tubes-last-in-a-tube-amplifier-2#comment-1785 Hi. Unfortunately there is no way of knowing when a tube will fail .That's why it is best to have spares. Also as a tube ages the sound quality begins to slowly deteriorate .so it is best to change them after they have been used for a long time .Apparently,tubes from amplifiers improve in sound quality and longevity after they have been deep-frozen to around 200 degrees Centigrade (around -328 degrees Fahrenheit ) To avoid damaging the tubes,the temperature changes must be very very slow.. Hi. Unfortunately there is no way of knowing when a tube will fail .That’s why it is best to have spares. Also as a tube ages the sound quality begins to slowly deteriorate .so it is best to change them after they have been used for a long time
.Apparently,tubes from amplifiers improve in sound quality and longevity after they have been deep-frozen to around 200 degrees Centigrade (around -328 degrees Fahrenheit )
To avoid damaging the tubes,the temperature changes must be very very slow..

]]> By: OR1234 http://audiograveyard.info/pro-audio/on-average-how-long-do-power-tubes-last-in-a-tube-amplifier-2#comment-1784 OR1234 Tue, 02 Mar 2010 10:46:11 +0000 http://audiograveyard.info/uncategorized/on-average-how-long-do-power-tubes-last-in-a-tube-amplifier-2#comment-1784 I worked in a University language lab one time and we had a bunch of tube amps. They were on 16 hours a day, every day. As I recall, the TEch Dir had me change the tubes every two years, whether or not they needed it. I only recall one failure--the plate had warped so much that it came in direct contact with the grid, causing a direct feedback loop, which melted the insides of the output transformer. Pretty exciting, with smoke, dripping melted insulation, the whole works. The tube was probably defective to start with. I worked in a University language lab one time and we had a bunch of tube amps. They were on 16 hours a day, every day. As I recall, the TEch Dir had me change the tubes every two years, whether or not they needed it.

I only recall one failure–the plate had warped so much that it came in direct contact with the grid, causing a direct feedback loop, which melted the insides of the output transformer. Pretty exciting, with smoke, dripping melted insulation, the whole works. The tube was probably defective to start with.

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