On 21/03/2015 07:15, RJH wrote:
On 19/03/2015 16:23, Dave Plowman (News) wrote:
In article ,
Jim Lesurf wrote:
I also wonder if *all* buyers of valve power amps knowingly do so on the
basis that the output values are 'consumables' and might need replacing
in as little as just over 90 days. (And by implication, replaced again
on such a routine short timescale.) No doubt savvy ones do. But do *all*
of them ?... The issue is complicated because some makers may soup up
the stress on the valves more than others. So it may not be clear to the
buyer what kind of life to expect for that particular amp design.

Last valve amps I had were Quad II. They certainly didn't need new output
valves every three months - and neither did the hundreds of valve power
amps the BBC used at the same time either. No one in their right mind
would build such a device. Or certainly not for commercial sales.


I've had valve amps somewhere in the chain for knocking on 20 years, and
this is the first time I xxxx remember a valve failing Admittedly, no
one amp has been in continuous use. The only one I use regularly is the
preamp. But I did have a monster Beard power amp for a good few years.

My point is the general one that valves can last a very long time. And
that I wasn't sure of valve failure symptoms - hence the original post.
If I could have avoided lashing out 40 quid, I would.


Ahem, corrected
--
Cheers, Rob