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Old 15th February 2009, 08:14 AM   #1
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Default 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?
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Old 15th February 2009, 08:49 AM   #2
Stixx is offline Stixx  Germany
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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...
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Old 15th February 2009, 10:33 AM   #3
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Default 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
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Old 15th February 2009, 12:50 PM   #4
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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.
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Old 15th February 2009, 03:08 PM   #5
Vlauga is offline Vlauga  Russian Federation
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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
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Old 15th February 2009, 06:58 PM   #6
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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?
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Old 16th February 2009, 09:02 AM   #7
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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
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Old 16th February 2009, 09:14 AM   #8
Tweeker is offline Tweeker  United States
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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.
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Old 16th February 2009, 03:45 PM   #9
rdf is offline rdf  Canada
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Quote:
Originally posted by audiodesign
Which is your opinion about the best cathode capacitor ?
Have you considered fixed bias?
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Old 16th February 2009, 05:50 PM   #10
jane is offline jane  Norway
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High end or not..
What is the 50Hz signal (~40dB below the 1KHz fundamental) in your spectrum analysis?

Click the image to open in full size.

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

JanE
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