On Sat, 21 Mar 2015 01:04:34 -0700 (PDT), Phil Allison
wrote:

Don Pearce wrote:


Valves are like pretty much any electronic part.

** Absolutely incorrect.

Valves are quite unique.



The closer you run
them to their maximum ratings, the shorter their lifetime.

** Absolutely false too.


Sure it is
possible to design an amplifier in which you can only guarantee the
valves for ninety days.

** Not what a 90 day warranty on valves even means.

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.


and you deserve
the small claims courts hitting you with Fitness For Purpose clause in
the Sale Of Goods Act.


** As if a colossal **** like YOU has any idea about that.


I don't know how it is in other parts of the world, but here in the UK
it is not possible to abrogate one's warranty obligations by printing
some kind of disclaimer on the product.


** Valves are user replaceable consumables - everyone knows that.

They are fragile, easily damaged by simple mistakes and very easily abused.

A 90 day warranty is generous and the industry standard for decades.

Valve dealers generally offer no warranty period at all.

Obviously you have SFA experience with valves.

FOAD.


... Phil



This kind of misguided thinking ended in the UK some time around 1944
when Colossus was built at Bletchley Park. It was found that by
underrunning the valves and not disturbing them, thousands of them
could be kept going for extended periods. I guess the news never
reached Australia.

d