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Audio and Video Talk
Valves / Vacuum Tubes
valve / tube life span ??
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<blockquote data-quote="Steerpike" data-source="post: 871636" data-attributes="member: 807"><p>Valve life is VERY dependent n the circuit it is used in. An ECC83 used in a hi fi preamplifier will last WAY longer than an EL34 used in a guitar amplifier.</p><p>Typical lives are 1000 hours to 10,000 hours or even longer for special quality editions.</p><p></p><p>Different cathode materials also have different life spans.</p><p></p><p>Even so, a good circuit is designed to minimise the effects of valve ageing. Up until the point of failure, you should not notice a salient change in performance as the valve characteristics slowly change. </p><p>That was good design technique in the 1950s and 1960s where a product had to last to maintain the good reputation of the company - modern 'fashionable' designs may place less emphasis on long term reliability.</p></blockquote><p></p>
[QUOTE="Steerpike, post: 871636, member: 807"] Valve life is VERY dependent n the circuit it is used in. An ECC83 used in a hi fi preamplifier will last WAY longer than an EL34 used in a guitar amplifier. Typical lives are 1000 hours to 10,000 hours or even longer for special quality editions. Different cathode materials also have different life spans. Even so, a good circuit is designed to minimise the effects of valve ageing. Up until the point of failure, you should not notice a salient change in performance as the valve characteristics slowly change. That was good design technique in the 1950s and 1960s where a product had to last to maintain the good reputation of the company - modern 'fashionable' designs may place less emphasis on long term reliability. [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
valve / tube life span ??
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