F5 power amplifier

[Melon Head]

I am not sure I agree with that.
First, if you have a 1000 Watt switchmode power supply, but only use 200 Watts then the work is not over the top.
Second, if you use a CRC capacitor bank after the power supply the noise can be removed.
However I do agree, as a general rule switchmodes are not a good choice.

[jleaman]

Originally Posted by thanh1973

I am not sure I agree with that.
If you have a 1000 Watt switchmode power supply, but only use 200 Watts then the work is not over the top.
Second if you use a CRC capacitor bank after the power supply the noise can be removed.
However I do agree, as a general rule switchmodes are not a good choice.

OK, find me a few NICE amplifiers like pass labs or krell or bryston etc etc, that use SMPS in there amplifiers, ? find any NOOOO! because they are not ment or used for it, these people have put more time and engineering into it, thus why no one still does it.

[Melon Head]

NuForce | High End Audio


Also have a look at the B1 buffer

[labjr]

Originally Posted by jleaman

OK, find me a few NICE amplifiers like pass labs or krell or bryston etc etc, that use SMPS in there amplifiers, ? find any NOOOO! because they are not ment or used for it, these people have put more time and engineering into it, thus why no one still does it.

This is about perceived value. The heavier the amp the more it's worth. Who's gonna pay good money for a featherweight amp? Ever notice the first thing they describe in an advertisement is the weight of the amp and the VA rating of the transformer. Then it's the number of output transistors along with the power rating of the devices.

You could use a SMPS and rail jumping scheme to reduce the number of output devices for a Crest-like amp with 1400 watts/ch in a 15 pound package but it's still only worth like $75-100 per pound.

[jleaman]

sorry smps psu's are not meant for amplifiers, computers or other things THATS it.!

[tinitus]

Im told that classA likes a supply with some resistance ( not the caps I suppose)
Maybe because it on all the time
Switch mode supply is the opposite

Maybe switch noise could make it hard on the sensible input jfets
Or even result in instability
But I know nothing about such things
#

[Melon Head]

What about all of the high frequency noise that is already on the AC power lines.
If I follow your philosophy, then I better start building my own coal fired or nuclear powered plant to ensure noise free ac.

If you can remove high frequency noise that is already on the ac lines then I don't see why you can't remove noise from a switch mode power supply.

I never said this was a good idea. I only asked if people had tried this.
I am the type of person that likes to learn from first hand experience and not to blindly follow.
If you say the world is flat, I say why.

The only other thing I would like to say about this, is it is not good to make generalisations here.
You could easily spend a $1000 on components and make an amplifier that sounds worse than an amplifier that Nelson could build for $200, if you don't know what you are doing.

It's not so much what you use, but more importantly, how you implement it.

[Variac]

Linn makes an amp with a switched power supply which seems to be quite favorably reviewed. From what I've heard- yes you can do it with a switched mode supply but you need a good one, and a good one will cost as much or more that a conventional supply. But it would be lighter and smaller.....

[Melon Head]

You also have the benefit of full voltage regulation.
Maybe when these SiC Jfets come down in price and manufacturers start using these in their switchmode power supplies, the switchmode power supply will no longer be a dirty word

[Melon Head]

Originally Posted by jleaman

sorry smps psu's are not meant for amplifiers, computers or other things THATS it.!

Tell that to these guys then NuForce | Awards