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Tube Phono Pre-Amplifiers
Tube Phono Pre-Amplifiers
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Old 1st October 2011, 01:02 AM   #1
mr2racer is offline mr2racer  United States
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Tube Phono Pre-Amplifiers
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Does anyone have design for a tube phono pre-preamp?
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Old 1st October 2011, 01:11 AM   #2
SY is offline SY  United States
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Tube Phono Pre-Amplifiers
First questions to consider before choosing (or designing):
1. Cartridge output?
2. Best loading for cartridge?
3. Desired gain?
4. Load to be driven? (usually 47k in parallel with some capacitance)
5. Acceptable degree of complication/expense?
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Old 1st October 2011, 01:15 AM   #3
6L6 is online now 6L6  United States
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Yes. However, it would be helpful to see your answers to SY's questions.
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Old 1st October 2011, 08:49 AM   #4
artosalo is offline artosalo  Finland
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Here is one quite basic circuit which gives good results with MM cartridges. Gain is some 46 dB.

Click the image to open in full size.

Kuva 19470 - Kuva.termiitti.com
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Old 1st October 2011, 12:00 PM   #5
SY is offline SY  United States
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The OP was looking for a pre-preamp, i.e., a flat gain amp to step up an MC to MM levels.
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Old 1st October 2011, 12:21 PM   #6
Eli Duttman is online now Eli Duttman  United States
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Quote:
Originally Posted by mr2racer View Post
Does anyone have design for a tube phono pre-preamp?
If (as SY thinks) you are looking for something to use instead of a SUT between a LOMC and a "routine" phono section, you are asking for trouble. Tubes are simply too noisy for use at these μV. level signals.

OTOH, if you want something to put between a MM level cart. and the line section, there are any number of satisfactory tube based designs available.

Please clarify your intentions and needs.
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Old 1st October 2011, 01:00 PM   #7
artosalo is offline artosalo  Finland
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Quote:
The OP was looking for a pre-preamp, i.e., a flat gain amp to step up an MC to MM levels.
How can you make such assumption ? I could not.
To me phono pre amplifier is such that contains RIAA correction and adequate gain.

mr2racer, could you clarify.
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Old 1st October 2011, 01:07 PM   #8
SY is offline SY  United States
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He said pre-preamp, not preamp. Yes, clarification is in order.
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Old 1st October 2011, 01:12 PM   #9
artosalo is offline artosalo  Finland
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Yes indeed, pre-preamp.
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Old 2nd October 2011, 07:21 AM   #10
Burnedfingers is offline Burnedfingers  United States
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If he is going to use a MC then how about a simple step up transformer using 2) 4722 Altec transformers to provide the necessay gain to marry the signal to a standard phono preamp? I believe Altec 15095 or 15095A's will also work also.

Http://members.myactv.net/~je2a3/mic-mcstep-up.htm
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File Type: jpg Altec 4722.jpg (49.8 KB, 1629 views)

Last edited by Burnedfingers; 2nd October 2011 at 07:28 AM.
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