Klaus Boening balanced phono amp

peranders · 13th August 2002, 08:49 PM

Does anyone have experience of the balanced phono amp designed by Klaus Boening?

http://www.klaus-boening.de/

Onvinyl · 25th May 2003, 01:26 PM

I'd like to second that question...
Rudiger

peranders · 25th May 2003, 03:42 PM

Klaus' phono amp is a beautiful overkill in a positive sense, very original. I haven't seen anything like it anywhere. I suspect also that only one amp exists, his.

Havoc · 25th May 2003, 07:14 PM

Only his MkIII is a balanced design.

Not my taste. But a phono stage with a balanced input is a nice thing. Since I use one, I won't go back.

Audiofanatic · 25th May 2003, 08:54 PM

Hi Havoc,

Can you tell us if the one you'r using is a DIY one and what was the difference? (Sonic wise)

Thanks in advance.

Audiofanatic

Havoc · 26th May 2003, 10:41 AM

Sort of DIY. It is a design by Barry Porter that was published in ETI. With a bit of luck I can find the date.

Uses 2 LM394 for each input as a front to an NE5532A. Rest is NE5534A balanced to unbalanced convertor. Then RIAA with another NE5534A and a servo loop to get the DC out. Servo loop I added myself, also extra stabilisation to the frontend so the rest can run on +/-20V.

Soundwise it is clear, but the main difference was a lot less hum and noise compared to the previous one. But you may have to re-wire your arm. If you connect the cartridge to a balanced input it may not be connected a ground somewhere. Also the connection to the preamp needs to become balanced.

Audiofanatic · 26th May 2003, 11:12 AM

Thanks a lot !

Audiofanatic

Havoc · 29th May 2003, 05:27 PM

For anyone who cares: it was published in ETI Februari 1987/March 1989. That's what I found on my pcb's (I always put it on the pcb). The last may be an update or so.

krishu · 8th June 2003, 08:07 PM

I do not know but i should contact him one day because he is living in the same city as i do. (Dresden)

Cheers
Christian.

Onvinyl · 17th June 2003, 07:07 PM

Yes, that is true! My desk is full of parts, lots of them!

Nearly finished the charging pcb for now.
But now I'm running into lots of questions.

1) When matching caps for the passive riaa, do I have to burn them in in any way before measuring?

2) What is the exceptional matching of fet's for? Why not simply matching after IDSS? What will I miss?

3) If some of the 9V accus are used to prevent the caps from switching + and - (see text on his homepage), how can I ever charge the accus safely?

4) One FET is used as a current source; has it the same IDSS, and if so, why?

That'll be lots of fun!
Rüdiger

13th August 2002, 08:49 PM	#1
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	Klaus Boening balanced phono amp Does anyone have experience of the balanced phono amp designed by Klaus Boening? http://www.klaus-boening.de/ __________________ /Per-Anders (my first name) or P-A as my friends call me Tube Buffered Gainclone in work \|Thread

25th May 2003, 03:42 PM	#3
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	Klaus' phono amp is a beautiful overkill in a positive sense, very original. I haven't seen anything like it anywhere. I suspect also that only one amp exists, his. __________________ /Per-Anders (my first name) or P-A as my friends call me Tube Buffered Gainclone in work \|Thread

25th May 2003, 08:54 PM	#5
Audiofanatic diyAudio Member Join Date: Oct 2002 Location: The Netherlands, Utrecht	Hi Havoc, Can you tell us if the one you'r using is a DIY one and what was the difference? (Sonic wise) Thanks in advance. Audiofanatic __________________ Be nice to animals.

26th May 2003, 11:12 AM	#7
Audiofanatic diyAudio Member Join Date: Oct 2002 Location: The Netherlands, Utrecht	Thanks a lot ! Audiofanatic __________________ Be nice to animals.

8th June 2003, 08:07 PM	#9
krishu diyAudio Member Join Date: Apr 2003 Location: .	I do not know but i should contact him one day because he is living in the same city as i do. (Dresden) Cheers Christian. __________________ Visit my DIY page at www.krishu.de


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25th May 2003, 01:26 PM	#2
Onvinyl diyAudio Member Join Date: Aug 2002 Location: Germany	I'd like to second that question... Rudiger

25th May 2003, 07:14 PM	#4
Havoc diyAudio Member Join Date: Feb 2002 Location: Belgium	Only his MkIII is a balanced design. Not my taste. But a phono stage with a balanced input is a nice thing. Since I use one, I won't go back.

26th May 2003, 10:41 AM	#6
Havoc diyAudio Member Join Date: Feb 2002 Location: Belgium	Sort of DIY. It is a design by Barry Porter that was published in ETI. With a bit of luck I can find the date. Uses 2 LM394 for each input as a front to an NE5532A. Rest is NE5534A balanced to unbalanced convertor. Then RIAA with another NE5534A and a servo loop to get the DC out. Servo loop I added myself, also extra stabilisation to the frontend so the rest can run on +/-20V. Soundwise it is clear, but the main difference was a lot less hum and noise compared to the previous one. But you may have to re-wire your arm. If you connect the cartridge to a balanced input it may not be connected a ground somewhere. Also the connection to the preamp needs to become balanced.

29th May 2003, 05:27 PM	#8
Havoc diyAudio Member Join Date: Feb 2002 Location: Belgium	For anyone who cares: it was published in ETI Februari 1987/March 1989. That's what I found on my pcb's (I always put it on the pcb). The last may be an update or so.

17th June 2003, 07:07 PM	#10
Onvinyl diyAudio Member Join Date: Aug 2002 Location: Germany	Ok, I'll be doing it! Yes, that is true! My desk is full of parts, lots of them! Nearly finished the charging pcb for now. But now I'm running into lots of questions. 1) When matching caps for the passive riaa, do I have to burn them in in any way before measuring? 2) What is the exceptional matching of fet's for? Why not simply matching after IDSS? What will I miss? 3) If some of the 9V accus are used to prevent the caps from switching + and - (see text on his homepage), how can I ever charge the accus safely? 4) One FET is used as a current source; has it the same IDSS, and if so, why? That'll be lots of fun! Rüdiger

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