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

Don Pearce 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.


This kind of misguided thinking


** Your kind of ****wit thinking is a criminal matter.


It was found that by
underrunning the valves and not disturbing them,


** So Don's ****wit thinking that comes from a massive irrelevance from 1944.

What you posted previously was idiotic.

This new crap is 10 times worse.

Are being mentally retarded and senile your only excuses ?

FFS FOAD.




.... Phil

In article ,
Phil Allison 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?

Sounds like all you've known is crap design valve amps. Nothing new there.

--
*WOULD A FLY WITHOUT WINGS BE CALLED A WALK?

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

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

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

In article ,
Phil Allison wrote:
Do you really think they'd have been happy changing output valves every
few months?

** The BBC could easily afford to do just that

Regardless if they could afford to or not, they didn't. You'll just have
to take my word for that.

and this is 2105 not 1950

I was talking of a decade (and more) later. And perhaps you'd tell us of
all the new valves in use now that weren't around then?

-0you idiotic ****.

Seems you know even less about valves than most things.

--
*PMS jokes aren't funny; period.*

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

Dave Plowman = a criminal ****.



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

** The BBC could easily afford to do just that

Regardless if they could afford to or not, they didn't.


** Obvious, blatant, lie.



You'll just have to take my word for that.


** Rather take the word of a serial child molester.

Any of whom are decent folk compared a vile autistic POS like you.

FOAD, ASAP.




.... Phil

In article ,
Phil Allison wrote:

Dave Plowman = a criminal ****.



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

** The BBC could easily afford to do just that

Regardless if they could afford to or not, they didn't.


** Obvious, blatant, lie.

Please give the dates you worked for the BBC. Mine, from 1962-1976. And at
the start of that, all their speaker amps were valve.


You'll just have to take my word for that.


** Rather take the word of a serial child molester.

I've no doubt you mix with several of those...

Now how about answering the point about all these new types of valves that
make such a difference from when valves were in common use? Of course you
can't, so just throw your toys out of the pram as usual.

--
*Out of my mind. Back in five minutes.

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

On Sun, 22 Mar 2015 14:36:09 +0000 (GMT), "Dave Plowman (News)"
wrote:

In article ,
Phil Allison wrote:

Dave Plowman = a criminal ****.



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

** The BBC could easily afford to do just that

Regardless if they could afford to or not, they didn't.


** Obvious, blatant, lie.

Please give the dates you worked for the BBC. Mine, from 1962-1976. And at
the start of that, all their speaker amps were valve.


You'll just have to take my word for that.


** Rather take the word of a serial child molester.

I've no doubt you mix with several of those...

Now how about answering the point about all these new types of valves that
make such a difference from when valves were in common use? Of course you
can't, so just throw your toys out of the pram as usual.

Thanks, Dave! Now I've got a mental picture of Billy Bass foaming and
frothing at the mouth, yeuch!

Phil Allison is "Billy Bass". http://www2.b3ta.com/fish/
--
J B Good