"StaffBull" wrote in message
...
Thanks for the helpful comments below - another question I have is if I
would leave a valve amp on all the time or switch it off and have to wait
for it to warm up every time I need it?

**ALL power amps should be switched off, until they are required for use.
There are several reasons for this:
* Leaving an amp switched on, accelerates wear and tear on several parts. In
SS amps, this means electrolytic caps. In valve amps, this means valves and
electrolytic caps.
* Leaving the amp switched on, leaves the amp open to line surges and
spikes, which may damage equipment.
* Leaving the amp switched on is not environmentally sensitive.

Tell me again why you would buy an amp, without first listening to it?
Tell my why you think this is a good idea?


--
Trevor Wilson
www.rageaudio.com.au

On Wed, 04 Aug 2004 01:39:29 GMT, "Trevor Wilson"
wrote:


"StaffBull" wrote in message
...
Thanks for the helpful comments below - another question I have is if I
would leave a valve amp on all the time or switch it off and have to wait
for it to warm up every time I need it?

**ALL power amps should be switched off, until they are required for use.

Hooey.

There are several reasons for this:
* Leaving an amp switched on, accelerates wear and tear on several parts. In
SS amps, this means electrolytic caps. In valve amps, this means valves and
electrolytic caps.

Hooey. If it's not a class A amp, or otherwise warm inside, it puts
less strain on the caps to leave them switched on. Start-up surges are
a major cause of cap failure.

My Audiolab 8000P has been switched on for about eight years, and
works just fine. I don't leave the Krell switched on, because it's a
true class A design, and pulls 300 watts from the wall at idle!

* Leaving the amp switched on, leaves the amp open to line surges and
spikes, which may damage equipment.

Only badly designed equipment, and not everywhere has such crappy
mains that this is an issue.

* Leaving the amp switched on is not environmentally sensitive.

Neither is farting, but I doubt it's a major issue.

Tell me again why you would buy an amp, without first listening to it?
Tell my why you think this is a good idea?

Seems like a bad idea - much like attempting to drive any decent
speaker with a cheap valve amp, when the same money would buy you a
sonically transparent SS amp.
--

Stewart Pinkerton | Music is Art - Audio is Engineering

"Stewart Pinkerton" wrote in message
...
On Wed, 04 Aug 2004 01:39:29 GMT, "Trevor Wilson"
wrote:


"StaffBull" wrote in message
...
Thanks for the helpful comments below - another question I have is if
I
would leave a valve amp on all the time or switch it off and have to
wait
for it to warm up every time I need it?

**ALL power amps should be switched off, until they are required for use.

Hooey.


Not hooey - all electrical items (without a built in timer needing stanby
current) should be switched off if not in use, including amplifiers. (Ask
your insurers.....)



My Audiolab 8000P has been switched on for about eight years, and
works just fine. I don't leave the Krell switched on, because it's a
true class A design, and pulls 300 watts from the wall at idle!


Presumably the Krell doesn't suffer from being switched off then? Or does it
take that bit longer to strike an arc.....???

;-)

"Keith G" wrote in message
...

"Stewart Pinkerton" wrote in message
...
On Wed, 04 Aug 2004 01:39:29 GMT, "Trevor Wilson"
wrote:


"StaffBull" wrote in message
...
Thanks for the helpful comments below - another question I have is
if
I
would leave a valve amp on all the time or switch it off and have to
wait
for it to warm up every time I need it?

**ALL power amps should be switched off, until they are required for
use.

Hooey.


Not hooey - all electrical items (without a built in timer needing stanby
current) should be switched off if not in use, including amplifiers. (Ask
your insurers.....)



My Audiolab 8000P has been switched on for about eight years, and
works just fine. I don't leave the Krell switched on, because it's a
true class A design, and pulls 300 watts from the wall at idle!


Presumably the Krell doesn't suffer from being switched off then? Or does
it
take that bit longer to strike an arc.....???

;-)


...with carbon rods.... for home cinema. ;-)

On Wed, 4 Aug 2004 14:51:57 +0100, "Mike Gilmour"
wrote:


"Keith G" wrote in message
...

"Stewart Pinkerton" wrote in message
...

My Audiolab 8000P has been switched on for about eight years, and
works just fine. I don't leave the Krell switched on, because it's a
true class A design, and pulls 300 watts from the wall at idle!

Presumably the Krell doesn't suffer from being switched off then? Or does it
take that bit longer to strike an arc.....???

;-)

...with carbon rods.... for home cinema. ;-)

I wouldn't recommend Krell AV gear to anyone - overpriced and from a
company that now has a truly **** reputation for customer care. :-(
--

Stewart Pinkerton | Music is Art - Audio is Engineering

On Wed, 4 Aug 2004 14:49:18 +0100, "Keith G"
wrote:


"Stewart Pinkerton" wrote in message
.. .
On Wed, 04 Aug 2004 01:39:29 GMT, "Trevor Wilson"
wrote:


"StaffBull" wrote in message
...
Thanks for the helpful comments below - another question I have is if
I
would leave a valve amp on all the time or switch it off and have to
wait
for it to warm up every time I need it?

**ALL power amps should be switched off, until they are required for use.

Hooey.

Not hooey - all electrical items (without a built in timer needing stanby
current) should be switched off if not in use, including amplifiers. (Ask
your insurers.....)

Insurers are concerned with fire risk, not capacitor failure. This is
a vexed question among audiophiles, for some mysterious reason, but
out in the real world of industrial electronics, most equipment is
kept permanently powered up. Anything with a valve in it (including
CRTs) shouldn't be permanently powered up, but that's virtually no
real-world equipment nowadays, aside from some radio transmitters.

So, the original poster should switch off his valve amp, but we
sensible folk can leave our class AB SS amps permanently switched on.


My Audiolab 8000P has been switched on for about eight years, and
works just fine. I don't leave the Krell switched on, because it's a
true class A design, and pulls 300 watts from the wall at idle!

Presumably the Krell doesn't suffer from being switched off then? Or does it
take that bit longer to strike an arc.....???

It's been working happily for about fifteen years, but it pretty much
*defines* overengineering! For instance, it's only rated at 50 watts
into 8 ohms, but it delivers 195 watts continuous into 4 ohms, both
channels driven. Basically, I'm just too mean to pay the bill for a
constant 300 watt drain! Naturally, the excess heat isn't a problem in
the UK.....................
--

Stewart Pinkerton | Music is Art - Audio is Engineering

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.

On Wed, 04 Aug 2004 20:57:23 +0100, "Dave Plowman (News)"
wrote:

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.

Indeed, and early computers with up to 10,000 valves also ran 24/7,
although IIRC they required a valve change every ten minutes! Talk
about a job for life.... :-)
--

Stewart Pinkerton | Music is Art - Audio is Engineering

"Stewart Pinkerton" wrote in message
...
On Wed, 04 Aug 2004 20:57:23 +0100, "Dave Plowman (News)"
wrote:

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.

Indeed, and early computers with up to 10,000 valves also ran 24/7,
although IIRC they required a valve change every ten minutes! Talk
about a job for life.... :-)

**My partner dragged out this quote from some computer guy in the 50's. It
went (to paraphrase):
"Sometime, in the future, computers will weigh less than 1.5 Tons."


--
Trevor Wilson
www.rageaudio.com.au

"Stewart Pinkerton" wrote in message

On Wed, 04 Aug 2004 20:57:23 +0100, "Dave Plowman (News)"
wrote:

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.

Indeed, and early computers with up to 10,000 valves also ran 24/7,
although IIRC they required a valve change every ten minutes! Talk
about a job for life.... :-)

Given that the tubes were probably good for at least 10,000 hour MTBF, as
much as an hour's worth of sustained operation might have been possible.

I worked on radar equipment with about 400 tubes, and with luck I could keep
it going for about 24 hours at a time. My person goal was a reliable 8
hours - namely the night shift.