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Old 23rd December 2012, 02:36 PM   #1
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Default TheTwelve SE class A TMC amplifier

Choke loaded SE class A with TMC implemented.
16W/8 Ohm (8W/4 Ohm)
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Old 23rd December 2012, 02:38 PM   #2
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Old 23rd December 2012, 02:46 PM   #3
Telstar is offline Telstar  Italy
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Interesting
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Old 23rd December 2012, 02:46 PM   #4
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How does the choke loading compare to a simple resistor load (zen lite) or a CCS load in sound quality ?
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Old 23rd December 2012, 02:54 PM   #5
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I didn`t try any other load. I wanted to try the choke cos` I had them and they`re more efficient then ccs and a resistor load. The amp sounds very nice and transparent.
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Old 23rd December 2012, 08:28 PM   #6
AKSA is offline AKSA  Australia
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BB,

Very nice circuit, carefully designed and built. It would sound marvellous, I'm sure. A choke is the best way to almost efficiency. You should be to reach 46Vpp output?

Cheers,

Hugh
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Old 23rd December 2012, 11:51 PM   #7
Bonsai is offline Bonsai  Taiwan
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Very nice! Very unusual indeed.
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Old 24th December 2012, 07:27 PM   #8
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BB,

Very nice circuit, carefully designed and built. It would sound marvellous, I'm sure. A choke is the best way to almost efficiency. You should be to reach 46Vpp output?

Cheers,

Hugh
Thanks.
I`ve used the transformer I had so is 32Vpp with 2A bias in 8 Ohms load.
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Old 25th December 2012, 05:01 AM   #9
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Bogdan, interesting schematics, with GNFB of a current type. I guess it has voltage gain around factor 7...8. Some things are not attractive to me, too much points with electrolytic caps, especially C5 in the NFB chain. Could you measure the value of output impedance?
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Old 25th December 2012, 09:05 AM   #10
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Originally Posted by VladimirK View Post
Bogdan, interesting schematics, with GNFB of a current type. I guess it has voltage gain around factor 7...8. Some things are not attractive to me, too much points with electrolytic caps, especially C5 in the NFB chain. Could you measure the value of output impedance?
I was also thinking that if the voltage of the output node wasnt too far above ground that the capacitors in the feedback could be eliminated with only a change in X1 (bias pot) value to give higher adjustment range.
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