Tube buffer for a cd player - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 27th October 2004, 05:43 AM   #1
ebijma is offline ebijma  Netherlands
diyAudio Member
 
ebijma's Avatar
 
Join Date: Mar 2004
Location: Huizen
Default Tube buffer for a cd player

Hello everbody,

Do some of you members have any diy information on building a tube output buffer for a cd player?
__________________
Music is what i want, music is what i need
  Reply With Quote
Old 27th October 2004, 11:08 AM   #2
diyAudio Member
 
Frank Berry's Avatar
 
Join Date: Sep 2003
Location: Midland, Michigan
What are your requirements? If you want to increase the output level of your CD player, you might build a SRPP stage.
If you don't need more output level, a simple Cathode Follower stage would be a good choice.
The benefit of these two types of amplifier stages is their low output impedance, making the choice of audio cables less critical.

You might want to look at this website.

http://www.bonavolta.ch/hobby/en/aud...Line%20preamps
__________________
Frank
  Reply With Quote
Old 27th October 2004, 03:04 PM   #3
ebijma is offline ebijma  Netherlands
diyAudio Member
 
ebijma's Avatar
 
Join Date: Mar 2004
Location: Huizen
Quote:
Originally posted by Frank Berry
What are your requirements? If you want to increase the output level of your CD player, you might build a SRPP stage.
If you don't need more output level, a simple Cathode Follower stage would be a good choice.
The benefit of these two types of amplifier stages is their low output impedance, making the choice of audio cables less critical.

You might want to look at this website.

http://www.bonavolta.ch/hobby/en/aud...Line%20preamps
Thanks Frank,

Thats a great link.
I want no gain so i think i'll go for the simple cathode follower.
__________________
Music is what i want, music is what i need
  Reply With Quote
Old 27th October 2004, 03:07 PM   #4
ebijma is offline ebijma  Netherlands
diyAudio Member
 
ebijma's Avatar
 
Join Date: Mar 2004
Location: Huizen
Found this circuit.
Don't know if its any good.
Maybe some of you members can give some input on this circuit.
Attached Images
File Type: jpg line tube buffer.jpg (47.8 KB, 988 views)
__________________
Music is what i want, music is what i need
  Reply With Quote
Old 27th October 2004, 04:11 PM   #5
diyAudio Member
 
Join Date: Nov 2003
Location: Genova, Italy
Hi
I think R4 is too little.

a value of 5k seems more advisable.

Federico
  Reply With Quote
Old 27th October 2004, 06:48 PM   #6
Nisbeth is offline Nisbeth  Denmark
diyAudio Member
 
Nisbeth's Avatar
 
Join Date: Jan 2001
Location: Denmark
Why do you think 5k is better?


/U.
  Reply With Quote
Old 28th October 2004, 06:33 AM   #7
ebijma is offline ebijma  Netherlands
diyAudio Member
 
ebijma's Avatar
 
Join Date: Mar 2004
Location: Huizen
Quote:
Originally posted by Nisbeth
Why do you think 5k is better?


/U.
I think it has to do with the max. current that flows through the tube.
__________________
Music is what i want, music is what i need
  Reply With Quote
Old 28th October 2004, 01:40 PM   #8
Sherman is offline Sherman  United States
diyAudio Member
 
Join Date: Feb 2004
Location: Chicago area
Quote:
Originally posted by ebijma
Found this circuit.
Don't know if its any good.
Maybe some of you members can give some input on this circuit.

The specs say those tubes can run at 24V but higher is better. You might try 35V or even up to 70 or 80V.
__________________
--Sherman
  Reply With Quote
Old 28th October 2004, 01:50 PM   #9
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
Hi,

Quote:
The specs say those tubes can run at 24V but higher is better.
Exactly.
The cct shown by Ebijma was developped for a Gainclone amp where this bipolar supply was already available.

Upping B+/B- should noticeably improve dynamic range and linearity.
Another useful technique to improve on it is to stick a CCS on the tail end.

Various other buffer types exist so pick your poison...

Cheers,
__________________
Frank
  Reply With Quote
Old 28th October 2004, 02:02 PM   #10
RIP
 
pedroskova's Avatar
 
Join Date: Dec 2002
Location: C'ville VA, USA
If you're looking for a low gain line section, I'd recommend Manfred Huber's "cheapskate's transformer coupled line preamp" over a cathode follower


Here is the schematic.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Tube buffer before pre-amp/amp? Destroyer OS. Instruments and Amps 2 9th January 2009 07:09 PM
Tube buffer (low voltage) for NI GC afriend Chip Amps 1 17th August 2006 02:26 PM
Tube buffer on TDA1543? sparkle Digital Source 0 23rd February 2004 07:22 AM
Tube Buffer IGC - need help .... Will Chip Amps 22 21st November 2003 07:54 AM
Tube buffer NickC Tubes / Valves 3 9th May 2002 11:20 AM


New To Site? Need Help?

All times are GMT. The time now is 02:56 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2