Tube buffer for a cd player

ebijma · 27th October 2004, 05:43 AM

Hello everbody,

Do some of you members have any diy information on building a tube output buffer for a cd player?

Frank Berry · 27th October 2004, 11:08 AM

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

ebijma · 27th October 2004, 03:04 PM

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.

ebijma · 27th October 2004, 03:07 PM

Found this circuit.
Don't know if its any good.
Maybe some of you members can give some input on this circuit.

fscarpa58 · 27th October 2004, 04:11 PM

Hi
I think R4 is too little.

a value of 5k seems more advisable.

Federico

Nisbeth · 27th October 2004, 06:48 PM

Why do you think 5k is better?

/U.

ebijma · 28th October 2004, 06:33 AM

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.

Sherman · 28th October 2004, 01:40 PM

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.

fdegrove · 28th October 2004, 01:50 PM

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,

pedroskova · 28th October 2004, 02:02 PM

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.

27th October 2004, 05:43 AM	#1
ebijma diyAudio Member Join Date: Mar 2004 Location: Huizen	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

27th October 2004, 11:08 AM	#2
Frank Berry diyAudio Member 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

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

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?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	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

27th October 2004, 04:11 PM	#5
fscarpa58 diyAudio Member Join Date: Nov 2003 Location: Genova, Italy	Hi I think R4 is too little. a value of 5k seems more advisable. Federico

27th October 2004, 06:48 PM	#6
Nisbeth diyAudio Member Join Date: Jan 2001 Location: Denmark	Why do you think 5k is better? /U.

28th October 2004, 02:02 PM	#10
pedroskova RIP 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.