Dave Plowman (Nutcase ****head) wrote:


24 x 90 hours is long enough to wear out some output valves out when
operating in class A as do most hi-fi amps including all SET amps.


Going back to valve days, plenty equipment in the BBC was on 24/7.
Including power amps.

Do you really think they'd have been happy changing output valves every
few months?

** The BBC could easily afford to do just that and this is 2105 not 1950 -0you idiotic ****.

FYI:

Took only seconds to find this advice from Acoustic Research.

" Generally, preamplifier tubes last up to 4,000 hours, while power amplifier output tubes will last up to 2,000 hours."

http://www.audioresearch.com/en-us/company/vacuum-tubes

Russian and Chinese valves are ALL you can buy and none match the quality or longevity of the best produced in Europe or America in the 50s, 60s and 70s.



.... Phil