Copyright © 1998
Cadman Enterprises Ltd
Welcome to the Graham Slee Audio Products Owners Forum Open to all owners plus those contemplating the purchase of a Graham Slee HiFi System Components audio product and wishing to use this forum's loaner program: join here (Rules on posting can be found here) This website along with trade marks Graham Slee and HiFi System Components are owned by Cadman Enterprises Ltd |
Class A vs Class AB |
Post Reply | Page <12 |
Author | |
Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
Post Options
Thanks(0)
|
Ever seen a 100W light bulb?
Yes, I know you have, but do you realise it disipates 100 watts without a heatsink? So do big valves. Because Eddison was trying to develop the light bulb when he accidentally discovered the valve! Therefore with big valves you can easily turn the wick up (the bias current that makes them conduct harder and become "class A" biased) Not so easy with a sliver of silicon stuck to a little metal tab (a transistor: Bipolar or FET) It needs a giant lump of finned aluminium to keep it "cool" Therefore, if you're going to that much trouble, you're not going to waste it by having a switch that puts it into A/B, where a much smaller heatsink would have done. |
|
That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
|
|
rhmbus
New Member Joined: 20 Apr 2008 Location: east london Status: Offline Points: 16 |
Post Options
Thanks(0)
|
Marantz did one a couple of years ago ,
ray
|
|
many an old tune
|
|
Analog Kid
Senior Member Joined: 07 Mar 2008 Location: Germany Status: Offline Points: 209 |
Post Options
Thanks(0)
|
That made me think: if you can get rid of the "transistor sound" from a solid-state power amplifier by making it operate in class A mode, then class A valve power amplifiers must sound extra valvey. Edited by Analog Kid - 14 Nov 2009 at 12:54am |
|
Post Reply | Page <12 |
Tweet
|
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |