Hi-end definitive vacuum tube phono pre

audiodesign · 15th February 2009, 08:14 AM

look the starting phase

http://www.audiodesignguide.com/Phono/pre-PhonoEnd.html

mod note: off-topic side thread split off to here What is the signal path -- the red line?

Stixx · 15th February 2009, 08:49 AM

Nice to see the C3G in your design.
It is in fact a very good tube that has awesome resolution and detail in my headphone amplifier...

duderduderini · 15th February 2009, 10:33 AM

I use a C3g as the first stage in my phono preamp.. great tube. now really expensive though.
Good luck

audiodesign · 15th February 2009, 12:50 PM

First:
It is possible use batteries or a dedicated power supply to skip RC on cathode and to insert a negative Vg but for the first stage this is possible only using the MC transformer or other input transformer.

Vlauga · 15th February 2009, 03:08 PM

For Hi-End lacked some details ...)

Do not take the starting point of Audio Note(PQ), they have good business and advertising. But until now they sound very far away.

The main thing for you.

1. The concentrated correction - not for MC/hiend... )
2. For applied by you of the correction network (not the type, value) are not present sense to use IT.
3. Sanyo OS-C it is capacitors for digital audio.
4. To use two equal tubes one after another - the bad solution for a good sound.

I have question for you, please. If you do not make it more difficult.
Your tubes C3g were no blue paper strip?

BW, VU

coldcathode · 15th February 2009, 06:58 PM

Again I hear more "noise" in this thread than my first attempt at a tube amp.

"Can't we all just get along?" LOL

I am still learning but a FEW things I have learned the following:

1) Phono is probably where we need the MOST gain, so reducing gain with unbypassed cathode R's will neccesitate adding more gain somewhere else. If we need a significant amount more gain then another stage is needed. Another stage increases the number of components in the signal path.

So question?

More gain at the expense of "minute" influences on signal integrity worth more than another stage have additional influences?

audiodesign · 16th February 2009, 09:02 AM

Which is your opinion about the best cathode capacitor ?

My list:

1) Sanyo OS-CON very neutral
2) Elna Cerafine a little bit too smooth
3) Elna Stargate bad metallic sound

Tweeker · 16th February 2009, 09:14 AM

If you dont need the gain and Zo of the stage isnt an issue.. pulling the cathode cap should improve the sound via local current feedback.

rdf · 16th February 2009, 03:45 PM

Quote:

Originally posted by audiodesign
Which is your opinion about the best cathode capacitor ?

Have you considered fixed bias?

jane · 16th February 2009, 05:50 PM

High end or not..
What is the 50Hz signal (~40dB below the 1KHz fundamental) in your spectrum analysis?

Is it 50Hz hum picked up by the transformers in the signal path (what ever the signal path may be) or something else?

JanE

15th February 2009, 08:14 AM	#1
audiodesign diyAudio Member Join Date: Sep 2005	Hi-end definitive vacuum tube phono pre look the starting phase http://www.audiodesignguide.com/Phono/pre-PhonoEnd.html mod note: off-topic side thread split off to here What is the signal path -- the red line?

15th February 2009, 10:33 AM	#3
duderduderini diyAudio Member Join Date: Mar 2004 Location: Albury NSW Australia	i use one of those I use a C3g as the first stage in my phono preamp.. great tube. now really expensive though. Good luck __________________ "Better to say nothing and keep them guessing than to speak and remove all doubt."

16th February 2009, 09:14 AM	#8
Tweeker diyAudio Member Join Date: Dec 2004 Location: Cincinnati, Ohio	If you dont need the gain and Zo of the stage isnt an issue.. pulling the cathode cap should improve the sound via local current feedback. __________________ Be sure your foil hat has a good low impedance ground.

16th February 2009, 05:50 PM	#10
jane diyAudio Member Join Date: Jul 2004 Location: Norway	High end or not.. What is the 50Hz signal (~40dB below the 1KHz fundamental) in your spectrum analysis? Is it 50Hz hum picked up by the transformers in the signal path (what ever the signal path may be) or something else? JanE __________________ Life is hard - Then you die.

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

15th February 2009, 08:49 AM	#2
Stixx diyAudio Member Join Date: Sep 2003 Location: Southern Germany	Nice to see the C3G in your design. It is in fact a very good tube that has awesome resolution and detail in my headphone amplifier...

15th February 2009, 12:50 PM	#4
audiodesign diyAudio Member Join Date: Sep 2005	First: It is possible use batteries or a dedicated power supply to skip RC on cathode and to insert a negative Vg but for the first stage this is possible only using the MC transformer or other input transformer.

15th February 2009, 03:08 PM	#5
Vlauga diyAudio Member Join Date: May 2005 Location: Msk	For Hi-End lacked some details ...) Do not take the starting point of Audio Note(PQ), they have good business and advertising. But until now they sound very far away. The main thing for you. 1. The concentrated correction - not for MC/hiend... ) 2. For applied by you of the correction network (not the type, value) are not present sense to use IT. 3. Sanyo OS-C it is capacitors for digital audio. 4. To use two equal tubes one after another - the bad solution for a good sound. I have question for you, please. If you do not make it more difficult. Your tubes C3g were no blue paper strip? BW, VU

15th February 2009, 06:58 PM	#6
coldcathode diyAudio Member Join Date: Jan 2009	Again I hear more "noise" in this thread than my first attempt at a tube amp. "Can't we all just get along?" LOL I am still learning but a FEW things I have learned the following: 1) Phono is probably where we need the MOST gain, so reducing gain with unbypassed cathode R's will neccesitate adding more gain somewhere else. If we need a significant amount more gain then another stage is needed. Another stage increases the number of components in the signal path. So question? More gain at the expense of "minute" influences on signal integrity worth more than another stage have additional influences?

16th February 2009, 09:02 AM	#7
audiodesign diyAudio Member Join Date: Sep 2005	Which is your opinion about the best cathode capacitor ? My list: 1) Sanyo OS-CON very neutral 2) Elna Cerafine a little bit too smooth 3) Elna Stargate bad metallic sound

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Hi-end Phono vacuum tube preamplifier MM	audiodesign	Vendor's Bazaar	0	5th March 2009 06:31 AM
S3E Vacuum Tube	angsuman	Tubes / Valves	12	15th March 2008 05:12 AM
Vacuum Tube Pre O.C.L.	gianmaria	Tubes / Valves	13	16th February 2006 06:32 PM
DIY Vacuum tube amp	turbo_h4	Tubes / Valves	2	1st July 2004 01:48 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