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Old 1st May 2013, 06:50 AM   #1
Gost22 is offline Gost22  Bolivia
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Question Tube buffer with 6n3-EV

Hello people!
Do this schemics can be used as a tube buffer for CD-player or required some changes to the schematics?
thank you!
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File Type: gif Graff-1.GIF (18.6 KB, 411 views)
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Old 1st May 2013, 07:38 AM   #2
McGyver is offline McGyver  Poland
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It's output resistance is high. And what for is the potentiometer at output? It makes things worse.
Why are you going to use buffer for CD player? What problem with CD player do you have?
What DAC chip do you have in this CD player? Maybe modification of analogue stage of your CD makes sense?
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Old 1st May 2013, 08:51 AM   #3
Gost22 is offline Gost22  Bolivia
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Quote:
Originally Posted by McGyver View Post
It's output resistance is high. And what for is the potentiometer at output? It makes things worse.
Why are you going to use buffer for CD player? What problem with CD player do you have?
What DAC chip do you have in this CD player? Maybe modification of analogue stage of your CD makes sense?
Hi McGyver!
I have a CD-player Technics want between the amplifier LM3886 to set the tube buffer for to get the tube sound!
If you have some good schematics or project with buffers (or catode follower) with tube 6n8s (6n7) or 6n3 only please!
Thank you for your cooperation!
P.S.
This is the original schematics: (view photos)
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File Type: jpg 4.jpg (48.5 KB, 389 views)
File Type: gif buffer_6n3.gif (5.7 KB, 382 views)

Last edited by Gost22; 1st May 2013 at 08:59 AM.
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Old 1st May 2013, 10:22 AM   #4
DF96 is offline DF96  England
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The original circuit is poor; the OP's mod is worse. Far too much gain, and a bass boost! This is not a 'tube buffer'.

Find a circuit which works, and build it unmodified. That is my advice. Alternatively, learn how to design/modify circuits yourself. Don't keep putting up copyright infringements and demanding that we improve them for you.
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Old 1st May 2013, 03:00 PM   #5
McGyver is offline McGyver  Poland
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The tube buffer between a source and amp can only spoil the signal quality and never improve. If you are unhappy with sound quality from your Technics CD player, then sell it on ebay, buy cheap Denon based on PCM56 or PCM61 and replace it's analogue stage with passive conversion followed by tube gainstage. The working example you can find on my site: Odtwarzacze CD (must do some scroll down).
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Old 2nd May 2013, 04:14 AM   #6
Gost22 is offline Gost22  Bolivia
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Quote:
Originally Posted by McGyver View Post
The tube buffer between a source and amp can only spoil the signal quality and never improve. If you are unhappy with sound quality from your Technics CD player, then sell it on ebay, buy cheap Denon based on PCM56 or PCM61 and replace it's analogue stage with passive conversion followed by tube gainstage. The working example you can find on my site: Odtwarzacze CD (must do some scroll down).
Hi ,
I want the output of a CD-player to connect tube buffer (Schematics-1 or schematics-2)?
Which of these schematics is preferred.
In the first schematics of what needs to be changed if you replace the 6n3 with 6n8s?
What anode voltage + B =? should be
In the schematics if it is placed 6n8s which values ​​should be on the schematics?
What anode voltage + B =?
P.S.
With this tube buffer (circuit) I want to get a nice tube/valve sound !!

Thank you for your cooperation.
Cheers!
Attached Images
File Type: jpg standard (Polich)-1.JPG (51.3 KB, 350 views)
File Type: jpg Polich-2.jpg (15.8 KB, 165 views)

Last edited by Gost22; 2nd May 2013 at 04:34 AM.
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Old 2nd May 2013, 08:10 AM   #7
McGyver is offline McGyver  Poland
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Those are schematics of internal analogue stage of chinese MHZS CD player. Those aren't buffers.
If you want to achieve a "nice tube sound" you do not need a buffer. You need a CD player or DAC with tube analogue stage and eventually in addition a tube preamplifier.
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Old 2nd May 2013, 02:33 PM   #8
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This is what I would do.

This of course has quite a lot of gain, so this could (should) be driven straight from the DAC output. Output can drive pretty much anything no problem.

MOSFETs can be for example IRF820 or IRF840, or some other high voltage MOSFET.

This could be just barely ok with B+ of 200 volts, but 250 is preferable. Plate voltage of around 140 volts gives a steady 12mA thru the tube, so the cathode bias diodes are happy with no extra current supplies.

This would give a really good sound, but don't know about the tube sound though. I'd venture to say much better than the op amp output in DACs.
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Old 2nd May 2013, 03:20 PM   #9
McGyver is offline McGyver  Poland
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To wchich DAC would you like to attach this circuit?
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Old 2nd May 2013, 05:17 PM   #10
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Any DAC.

Well the circuit I showed is single ended, so preferably a DAC with a single ended output.

Amplifying and buffering small signals (like 0.127 volts from a DAC) of course benefits greatly from a properly regulated power supply.
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