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Post by MartinT on Dec 22, 2014 17:53:51 GMT
Maybe even a pair of those naff old Usher jobbies Martin has Oi - keep your hands off!
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Post by ChrisB on May 3, 2015 7:58:10 GMT
Here's a lovely old thing, a Thorens AZ-25 integrated valve amp - 16 wpc
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Post by Deleted on May 3, 2015 12:50:15 GMT
Stax list it as "A Class" not "Class A" However 150W Class A is perfectly possible in both solid state and valves. So the jury is out ! Daniel, there is a good reason why I employ solicitors........... For the benifit of the novice would you explain what A Class is please? I assume it means more than just 'very good'?!
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Post by pre65 on May 3, 2015 13:14:41 GMT
It's about how the signal is processed by the amplifier.
Read about the different classes in this Wikipedia article.
en.wikipedia.org/wiki/Amplifier#Class_A
Class A is inefficient, but supposedly better sounding.
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Post by Deleted on Jun 28, 2015 17:45:38 GMT
It's about how the signal is processed by the amplifier.
Read about the different classes in this Wikipedia article.
en.wikipedia.org/wiki/Amplifier#Class_A
Class A is inefficient, but supposedly better sounding. I read it and think I give enough of my hard earned cash to N-Power, so it's class c or D for me!
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Post by Deleted on Jun 28, 2015 19:30:37 GMT
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Post by MartinT on Jun 29, 2015 5:28:34 GMT
That's so gorgeous I've posted the pic for you, Andr'e.
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Post by pinkie on Jun 29, 2015 7:57:16 GMT
It's about how the signal is processed by the amplifier.
Read about the different classes in this Wikipedia article.
en.wikipedia.org/wiki/Amplifier#Class_A
Class A is inefficient, but supposedly better sounding. I read it and think I give enough of my hard earned cash to N-Power, so it's class c or D for me!The "big deal" with Class A is lack of cross-over distortion. AB designs suffer because of non-linearity of response as the sinewave voltage drops near zero, due to the devices switching on and off. Class A bias puts the signal variations into a relatively linear part of the devices operating range (whether the device is a valve or a transistor in its various flavours). But that uses a lot of energy even when no music is playing. If you can eliminate cross-over distortion - you get class A sound -but not class A power consumption and heat. Take a look at my Benchmark thread - "and now for something completely different". You get (better than) class A sound, and minimum payments to NPower or whoever delivers the stuff to your house. Mind - its not a completely free ride. The amp costs £3000 in this country
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Post by ChrisB on Aug 26, 2015 7:34:01 GMT
How about these speakers then? BES SM100 Bertagni Electroacoustic Systems were based in California and the man behind the company was Dr. Jose Bertagni, an ex-professor of electrical engineering at the University of Buenos Aires. Technical description (from a non-technical source - New York Times, October 1982) Rear inside view
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Post by Deleted on Aug 26, 2015 10:43:33 GMT
Hi Chris Um can't help thinking Yamaha 'NS250E' speakers..
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Post by Deleted on Aug 26, 2015 11:37:08 GMT
I read it and think I give enough of my hard earned cash to N-Power, so it's class c or D for me! The "big deal" with Class A is lack of cross-over distortion. AB designs suffer because of non-linearity of response as the sinewave voltage drops near zero, due to the devices switching on and off. Class A bias puts the signal variations into a relatively linear part of the devices operating range (whether the device is a valve or a transistor in its various flavours). But that uses a lot of energy even when no music is playing. If you can eliminate cross-over distortion - you get class A sound -but not class A power consumption and heat. Take a look at my Benchmark thread - "and now for something completely different". You get (better than) class A sound, and minimum payments to NPower or whoever delivers the stuff to your house. Mind - its not a completely free ride. The amp costs £3000 in this country There's rather more to the superiority of class A than just the elimination of crossover distortion! It is technically superior to any other technique in several ways, it's only down side being the size, expense and power consumption.
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Post by ChrisB on Aug 26, 2015 13:28:32 GMT
Hi Chris Um can't help thinking Yamaha 'NS250E' speakers.. That is exactly what I thought when I saw them (except, I wouldn't have remembered the model number!)
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Post by Deleted on Aug 26, 2015 13:52:07 GMT
lol im very sad person it's no suprise..
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Post by MartinT on Aug 26, 2015 16:48:38 GMT
Heh, heh, we rely on you to be model-perfect, Andr'e
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Post by ChrisB on Aug 26, 2015 17:40:05 GMT
Have you come across the BES speakers before, Andre? I've seen them being called electrostatics on various websites, which they are quite clearly not.
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Post by Deleted on Aug 26, 2015 18:18:43 GMT
There was an electrostatic made in USA that looked like a pair of standard lamps and I think actually had bulbs in and gave light...
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Post by ChrisB on Aug 26, 2015 19:54:20 GMT
There were several like that. Acoustica made at least 3 different Omnisonic models including a table lamp and a ceiling one too.
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Post by ChrisB on Feb 18, 2019 23:16:34 GMT
Micro SX-5000/2 (1984)
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Post by ChrisB on Feb 18, 2019 23:33:33 GMT
Hartley Model 224 24" woofers with a 6.4kg magnet
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Post by MartinT on Feb 19, 2019 7:18:11 GMT
I rarely see any Phase Linear kit these days. Once considered THE brand for huge power requirements.
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