Tube Phono Pre-Amplifiers - 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 1st October 2011, 01:02 AM   #1
diyAudio Member
 
mr2racer's Avatar
 
Join Date: Jul 2009
Default Tube Phono Pre-Amplifiers

Does anyone have design for a tube phono pre-preamp?
  Reply With Quote
Old 1st October 2011, 01:11 AM   #2
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
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?
__________________
And while they may not be as strong as apes, don't lock eyes with 'em, don't do it. Puts 'em on edge. They might go into berzerker mode; come at you like a whirling dervish, all fists and elbows.
  Reply With Quote
Old 1st October 2011, 01:15 AM   #3
6L6 is offline 6L6  United States
diyAudio Member
 
6L6's Avatar
 
Join Date: Oct 2010
Location: Denver, Colorado
Yes. However, it would be helpful to see your answers to SY's questions.
  Reply With Quote
Old 1st October 2011, 08:49 AM   #4
diyAudio Member
 
artosalo's Avatar
 
Join Date: Feb 2010
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
  Reply With Quote
Old 1st October 2011, 12:00 PM   #5
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
The OP was looking for a pre-preamp, i.e., a flat gain amp to step up an MC to MM levels.
__________________
And while they may not be as strong as apes, don't lock eyes with 'em, don't do it. Puts 'em on edge. They might go into berzerker mode; come at you like a whirling dervish, all fists and elbows.
  Reply With Quote
Old 1st October 2011, 12:21 PM   #6
diyAudio Member
 
Join Date: Apr 2004
Location: Monroe Township, NJ
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.
__________________
Eli D.
  Reply With Quote
Old 1st October 2011, 01:00 PM   #7
diyAudio Member
 
artosalo's Avatar
 
Join Date: Feb 2010
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.
  Reply With Quote
Old 1st October 2011, 01:07 PM   #8
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
He said pre-preamp, not preamp. Yes, clarification is in order.
__________________
And while they may not be as strong as apes, don't lock eyes with 'em, don't do it. Puts 'em on edge. They might go into berzerker mode; come at you like a whirling dervish, all fists and elbows.
  Reply With Quote
Old 1st October 2011, 01:12 PM   #9
diyAudio Member
 
artosalo's Avatar
 
Join Date: Feb 2010
Yes indeed, pre-preamp.
  Reply With Quote
Old 2nd October 2011, 07:21 AM   #10
diyAudio Member
 
Join Date: Nov 2002
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
Attached Images
File Type: jpg Altec 4722.jpg (49.8 KB, 1545 views)

Last edited by Original Burnedfingers; 2nd October 2011 at 07:28 AM.
  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
What tube for QUIET phono pre?? Freecrowder Tubes / Valves 8 27th August 2010 01:17 PM
Tube phono pre-amp needed. Runco990 Tubes / Valves 28 23rd March 2007 04:20 AM
Question about Thorsten's Tube Phono Pre BHD Tubes / Valves 0 1st February 2007 02:12 AM
Tube Phono Pre of RJM ebijma Tubes / Valves 5 30th September 2005 01:04 PM


New To Site? Need Help?

All times are GMT. The time now is 03:44 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