Its not a new technology. Its been around for a long time.Patill wrote:ah, ok, that could be the point.
Anybody ever tested this? Well, I could buy a Legacy 2 and test it myself . I´m running my Legacy through an attenuator, even if it´s not really loud for a 100 Watts tube amp.
But really, I don´t think this is a method to saturade your tubes and get this Poweramp distortion like sound, I think it´s only good to be able to play at bedroom levels. Well, maybe I´m wrong, but that´s the first thing that came to my mind. If you want poweramp tube saturation, you must play at high volumes, so the tubes can work in their best, of course the volume needs to be reduced at home. That means you need to put a resistor between poweramp and speaker. But I´d really like to know more about this technology. Any further information how this works? Maybe it does saturate the tubes, but in which way? Maybe a bonebreaking new thing .
London Power Scaling puts the "work" part before the output transformers at the power tube stage. Attenuators put the work part between the head and the speakers. LPS scales back the voltage to the power tubes which causes them to compress as they normally would, but at lower volumes. I am not a big electronics geek so I am not 100% versed on it works exactly, but the approach is much different and you get much different results.
One guy explained it to me this way:
Take your 100 watt legacy and replace the 100 watt (4 x 25) power tubes with 1 watt (4 x .25) power tubes and crank it. They will compress like they normally would because you are maxing the .25 watt tubes out, but it will be much quieter. If the 100 watt tubes are the same as the 1 watt tubes, it should scale back evenly. All things being equal. That power tube distortion doesnt come from the volume itself, it comes from hitting that sweet spot of where you have applied enough voltage to get the power tubes to start to compress/clip.
Obviously this is not exactly how it works, but thats how he got the idea of how it works across to me. Like I said I am an electronics n00b.
There are some more details over at the London power site:
http://www.londonpower.com/pscaling.htm" onclick="window.open(this.href);return false;
Most people that have heard an amp with LPS say it sounds very similar when you scale it back, but it "feels" different because you dont have the interaction with the speakers like you would on a cranked amp. You dont get that feeling of the sound waves beating you up as you play.
I have a buddy of mine that builds all these homebrewed 5/10 watt amps and they kick ass. They have a great tone because you are taking the tubes and maxing them out, but its still at low volumes. They dont sound exactly like my amp cranked, but they sounds pretty damn good for a 10 watt tube amp.