Balanced Phono
- Paul Barker
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#1 Balanced Phono
I wander why Alan Wright changed this circuit slightly between 1998 and 2000
https://www.southampton.ac.uk/~apm3/diy ... tp3c_s.gif
Main difference of significance is b+ rail 300v rather than 200v.
Bugger I'd just ordered a bunch of the 170 devices when I saw the preferred dual bipolars. So had to then order those. I assume that the dual bipolars are inherently better matched. Pot luck for me as I wouldn't know where to begin matching them.
other differences seem insignificant.
https://www.southampton.ac.uk/~apm3/diy ... tp3c_s.gif
Main difference of significance is b+ rail 300v rather than 200v.
Bugger I'd just ordered a bunch of the 170 devices when I saw the preferred dual bipolars. So had to then order those. I assume that the dual bipolars are inherently better matched. Pot luck for me as I wouldn't know where to begin matching them.
other differences seem insignificant.
"Two things are infinite, the universe and human stupidity, and I am not yet completely sure about the universe." – Albert Einstein
#2 Re: Balanced Phono
Well the toshiba parts were discontinued. Also look at
http://www.linearsystems.com/assets/med ... LSK489.pdf
http://www.linearsystems.com/assets/med ... LSK489.pdf
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.
- Paul Barker
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#3 Re: Balanced Phono
Thank you.
"Two things are infinite, the universe and human stupidity, and I am not yet completely sure about the universe." – Albert Einstein
- Paul Barker
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#4 Re: Balanced Phono
Managed to get two of the mat02 pairs on ebay. Couldn't find the dual fets lsk489 for sale anywhere.
"Two things are infinite, the universe and human stupidity, and I am not yet completely sure about the universe." – Albert Einstein
#5 Re: Balanced Phono
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.
- IslandPink
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#6 Re: Balanced Phono
Looks like you're up to something, Paul .
Allen's RTP3C sounded very good at ETF 2005 .
Allen's RTP3C sounded very good at ETF 2005 .
"Once you find out ... the Circumstances ; then you can go out"
- Paul Barker
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#7 Re: Balanced Phono
Well it's just common sense really Mark, no point reinventing the wheel. Good to het your feedback on the sound. Those of you who have used similar unbalanced have given good reports. I know of course that you Mark were geting very involved incorporating suggestions from Jo roberts et al. But I'm not wanting to do things on the extreme level right now. Maybe when I have a different home life.
Morgan was explaining on Saturday that there are few good balanced step up transformers, and with the dl103 I presently use he advised electronic gain as he put it.
I would use AW phono section, gain after that; I'll have to see how much voltage gain I need in front of Barbaric. Adust on test.
Morgan was explaining on Saturday that there are few good balanced step up transformers, and with the dl103 I presently use he advised electronic gain as he put it.
I would use AW phono section, gain after that; I'll have to see how much voltage gain I need in front of Barbaric. Adust on test.
"Two things are infinite, the universe and human stupidity, and I am not yet completely sure about the universe." – Albert Einstein
- Paul Barker
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#8 Re: Balanced Phono
Thanks for that suggestion Nick? I've registered with them, just waiting for approval.
"Two things are infinite, the universe and human stupidity, and I am not yet completely sure about the universe." – Albert Einstein
- Paul Barker
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#9 Re: Balanced Phono
Valve Amplifiers 4th edition was waiting for me at home. Wider research mode begins.
"Two things are infinite, the universe and human stupidity, and I am not yet completely sure about the universe." – Albert Einstein
- Paul Barker
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#10 Re: Balanced Phono
OK I've read enough to prefer Morgan's version.
You would have to buy the book to know the schematic.
The salient differences are lower b+ greater first stage gain, smaller coupling caps by a factor of 10, simpler final gain stage. It's just more my thing.
You would have to buy the book to know the schematic.
The salient differences are lower b+ greater first stage gain, smaller coupling caps by a factor of 10, simpler final gain stage. It's just more my thing.
"Two things are infinite, the universe and human stupidity, and I am not yet completely sure about the universe." – Albert Einstein
- pre65
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#11 Re: Balanced Phono
Paul, I've got the Chinese version of edition 4 which Morgan gave me.
Can you tell me the chapter, and illustration number please ? My Chinese is a little ropy.
Can you tell me the chapter, and illustration number please ? My Chinese is a little ropy.
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
- Paul Barker
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#12 Re: Balanced Phono
In my book it's page 644 Figure 7_49 balanced hybrid riaa
"Two things are infinite, the universe and human stupidity, and I am not yet completely sure about the universe." – Albert Einstein
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#13 Re: Balanced Phono
There are less pages in the Chinese version, but I've found the diagram. Thanks.Paul Barker wrote:In my book it's page 644 Figure 7_49 balanced hybrid riaa
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
#14 Re: Balanced Phono
What is a balanced step up transformers? AFAIK, any step up can be used balanced as long as you remove the earth connection on its output.Morgan was explaining on Saturday that there are few good balanced step up transformers
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.
#15 Re: Balanced Phono
You can see page 644 here if you are interested
https://books.google.co.uk/books?id=QdG ... &q&f=false
https://books.google.co.uk/books?id=QdG ... &q&f=false
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.