In article ,
Stewart Pinkerton wrote:
Anything with a valve in it (including CRTs) shouldn't be permanently
powered up,

It's not so very long ago that all broadcasting equipment was valve, and
plenty was left powered up 24/7. Indeed, a power failure could result in
lots of replacements after it was resumed.
But that equipment was designed for this task - I'm not convinced el
cheapo valve amps are.

--
*The most common name in the world is Mohammed *

Dave Plowman London SW
To e-mail, change noise into sound.