To reask a question that's been asked a million times, any harm in leaving your class - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 9th May 2014, 08:35 PM   #1
ag8908 is offline ag8908  United States
diyAudio Member
 
Join Date: Mar 2014
Default To reask a question that's been asked a million times, any harm in leaving your class

To reask a question that's been asked a million times, any harm in leaving your class A amplifier on all day every day?

I heard it can wear out capacitors or something, but then another website says that no -- actually your capacitors wear out from the surge of energy that goes into them when you turn the amp off and on, and that a class A amp lasts longer if you leave it on all the time.

Does anyone know the answer?
  Reply With Quote
Old 9th May 2014, 08:53 PM   #2
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Hi,

The second statement is true for pretty much near everything.
(e.g. lightbulbs, they always go being turned on.)
On/Off cycles greatly reduce reliability, but well designed
equipment is so intrinsically reliable it doesn't really care.

rgds, sreten.

Early valve computers were only reliable if never switched off.
__________________
There is nothing so practical as a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow
  Reply With Quote
Old 9th May 2014, 08:59 PM   #3
ag8908 is offline ag8908  United States
diyAudio Member
 
Join Date: Mar 2014
so is there any harm to leaving a class a amp on all the time? assume power consumption is not an issue.
  Reply With Quote
Old 9th May 2014, 10:12 PM   #4
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Hi,

No. But I have a friend who doesn't like using his (IMO utterly stupid)
single ended class A monoblocks in the summer, due to the heat,
and he would not remotely consider leaving them on all the time.

But he got valve life to deal with as well, presumably you don't.

No harm basically.

rgds, sreten.
__________________
There is nothing so practical as a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow
  Reply With Quote
Old 9th May 2014, 10:27 PM   #5
evanc is offline evanc  United States
diyAudio Member
 
Join Date: Sep 2009
Location: New Jersey. About 1 hour from NYC and 1 min. from the beach
Kyoto Protocol - Wikipedia, the free encyclopedia
Seems wasteful to leave it on all the time.
__________________
http://www.evancotler.com
  Reply With Quote
Old 9th May 2014, 10:30 PM   #6
diyAudio Member
 
Join Date: Sep 2004
Location: Minneapolis, Minnesota, USA
I think it depends on if the ventilation is adequate enough that the internal components, electrolytics caps in particular, stay as cool as possible. Long ago I owned a Stax Class A 40 watt amp. That bugger put out a lot of heat and much of it ended up inside the case, the components were under a lot of thermal stress if it wasn't allowed plenty of free space to work in. That was one of the the best sounding amps I've ever owned, but the heat output was a real problem.

Mike
  Reply With Quote
Old 9th May 2014, 10:31 PM   #7
diyAudio Member
 
5th element's Avatar
 
Join Date: Oct 2002
Location: England
The only thing that could be a problem is the electrolyte drying out inside the capacitors. The higher the temperature the quicker it goes, so leaving the amp on all the time will dry the electrolyte out at a faster rate, but if this is a problem depends entirely on the amplifiers thermal design. Some class A amplifiers don't get that hot inside the case as they are well ventilated and all the heat is conducted away through externally mounted heatsinks.
__________________
What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz!
  Reply With Quote
Old 9th May 2014, 10:58 PM   #8
diyAudio Member
 
Danger Mouse's Avatar
 
Join Date: Nov 2011
Location: beautiful Oberpfalz Bavaria
I shut my class A stuff off after listening.
And turn it on 1h befor critical listening. That should be the warm up time in my case.

if caps have a shorter live because on/off, i will recap the amp a little bit earlier, should cost the same like the Extended power bill if i leave it on the hole time.

Interesting for the on/off question for me, is only how long dos it take till the amp sound at its best.
  Reply With Quote
Old 9th May 2014, 11:44 PM   #9
ag8908 is offline ag8908  United States
diyAudio Member
 
Join Date: Mar 2014
Quote:
Originally Posted by Michael Bean View Post
I think it depends on if the ventilation is adequate enough that the internal components, electrolytics caps in particular, stay as cool as possible. Long ago I owned a Stax Class A 40 watt amp. That bugger put out a lot of heat and much of it ended up inside the case, the components were under a lot of thermal stress if it wasn't allowed plenty of free space to work in. That was one of the the best sounding amps I've ever owned, but the heat output was a real problem.

Mike
Did the heat kill the amp, or was the heat just annoying? This amp is a Burson Conductor, Burson Audio Australia About Burson Audio

I like it because it's very clear and transparent. Makes all songs sound different. Not an all the time amp but it's good for a change of pace.

It does get pretty hot, especially since I keep it in a cabinet that is closed (except for like a 7 inch by 7 inch vent in the back).

Basically I'm trying to simplify my life. It would be nice if I could just leave it on (it probably gets 130 degrees inside?) and just have it ready to go whenever I get a desire to listen to it. Why does super high quality audio require so much babying?
  Reply With Quote
Old 9th May 2014, 11:47 PM   #10
ag8908 is offline ag8908  United States
diyAudio Member
 
Join Date: Mar 2014
by the way, if anyone can explain Burson's "no to ic amps" philosophy in a really really dumbed down way that would be great. the amp does sound amazingly clear so they did something right.

on certain songs, I can literally hear the lips of the singer smacking between lyrics
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Leaving class A how to make this amp leave class A to AB when volume is increased? rhythmsandy Solid State 2 15th June 2013 07:02 AM
Leaving Class A? Martin Colloms vs Nelson Pass RobertS61 Pass Labs 50 9th January 2010 09:23 PM
Reading Leaving Class A . . . Babowana Pass Labs 11 4th October 2009 01:09 AM
Leaving Class A Nelson Pass Pass Labs 31 28th August 2008 11:19 PM
Answer to the Question No One Asked-A Work in Progress.... johnbrown Analogue Source 0 7th June 2007 01:32 AM


New To Site? Need Help?

All times are GMT. The time now is 03:40 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2