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Old 12th January 2011, 06:13 PM   #1
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Default My best sound amplifier of these last 20 years

see on:

Hybrid Circlotron Amplifier with only 3 components on the signal path
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Old 12th January 2011, 07:51 PM   #2
WuYit is offline WuYit  Sweden
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Hi,
congratulations, you have good taste in sound.

Everything is in the signal path, even the air.
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Old 14th January 2011, 01:21 AM   #3
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http://www.lundahl.se/pdfs/datash/1671.pdf

Is the connection Alt.V ?
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Old 14th January 2011, 04:53 AM   #4
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Please check the transformer connections in the image at the end of project webpage
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Old 23rd January 2011, 07:58 AM   #5
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The web page of this project has been update with more info.

Hybrid Amplifier by Andrea Ciuffoli

After 3 different listen sections on the prototype with different friends I can confirm that this amplifier is superior to my 813/GM70 SE, Hybrid 2010, PP2010 and New Class D.

The propagation speed of sound is terrible and attracts and involves everyone who hears.

The level of details is extreme and never is present a listening fatigue.

It is very difficult return to ear any other amplifier after these listen tests.

I suggest it to any DIY in any version, with 5842 or 6C45, with CLR power supply or simple and with any type of mosfet suggested.

You can build it also with surplus components and the unique "big" cost will be the interstage transformers Lundahl LL1671.

I will continue to develop this project in this year and I am selling all the other amplifiers at low cost.
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Old 23rd January 2011, 10:08 AM   #6
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Why are there two resistors connected "antiparallel"???
Do you believe that resistors have a polarity???
Or is it just for increased wattage and the polarity mark not to taken serious?
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Old 23rd January 2011, 11:21 AM   #7
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Inductance cancellation for sure.
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Old 23rd January 2011, 12:23 PM   #8
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Sometimes non-inductive resistors may be hard to find, or expensive.
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Old 23rd January 2011, 01:29 PM   #9
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Nice to see your efforts up on the web Andrea. While not everyone would do things the way you do, that really is not an issue. As long as it sounds good to you, and you get pleasure out of building it and writing about it, that's all that matters.

Good luck!
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Old 23rd January 2011, 02:14 PM   #10
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Yes, the unique neutral resistors are Caddock MK132 and some similar Vishay.

If you use normal 1% metal resistors in the parallel connection and with inverted phase these combination give a result near to the Caddock MK132.

http://www.audiodesignguide.com/Hybrid2011/Conn1a.gif
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