12ax7 preamp,need help. - 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 8th April 2004, 07:51 AM   #1
digi01 is offline digi01  China
diyAudio Member
 
digi01's Avatar
 
Join Date: Mar 2003
Location: BEIJING
Send a message via MSN to digi01
Default 12ax7 preamp,need help.

I have a couple of 12AX7LPS tubes, plan make a preamp.have what propose?
  Reply With Quote
Old 8th April 2004, 10:55 AM   #2
diyAudio Member
 
analog_sa's Avatar
 
Join Date: Aug 2002
Location: Sofia
Get different tubes.
  Reply With Quote
Old 8th April 2004, 11:02 AM   #3
diyAudio Member
 
Frank Berry's Avatar
 
Join Date: Sep 2003
Location: Midland, Michigan
What type of preamp? Phono or a basic system control preamp.
__________________
Frank
  Reply With Quote
Old 8th April 2004, 02:39 PM   #4
diyAudio Member
 
analog_sa's Avatar
 
Join Date: Aug 2002
Location: Sofia
These days when people say preamp they mean line stage. The 12AX7 is probably suitable for phono duties but quite pointless in a line stage.
  Reply With Quote
Old 9th April 2004, 02:17 AM   #5
digi01 is offline digi01  China
diyAudio Member
 
digi01's Avatar
 
Join Date: Mar 2003
Location: BEIJING
Send a message via MSN to digi01
thanks for reply

I plan to make a line stage,A lot of friends around me say that 12AX7LPS are adjusted very badly,but the sound is very fine,very warm.

This is my sch,any suggestions?
Attached Images
File Type: gif 12ax7sch.gif (6.9 KB, 491 views)
  Reply With Quote
Old 9th April 2004, 03:08 AM   #6
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
Hi,

The cap after the 6X4 is really high, about 10F should be a lot safer.

Cheers,
__________________
Frank
  Reply With Quote
Old 9th April 2004, 03:17 AM   #7
digi01 is offline digi01  China
diyAudio Member
 
digi01's Avatar
 
Join Date: Mar 2003
Location: BEIJING
Send a message via MSN to digi01
sure,thank you.

-digi
  Reply With Quote
Old 9th April 2004, 03:45 AM   #8
diyAudio Member
 
cogsncogs's Avatar
 
Join Date: Jul 2003
Location: Wayne, West Virginia
Quote:
The cap after the 6X4 is really high, about 10F should be a lot safer.
Yes definitely change that cap. Should sound nice and warm and fuzzy!

Enjoy!
Wayne
  Reply With Quote
Old 9th April 2004, 10:04 AM   #9
diyAudio Member
 
Alastair E's Avatar
 
Join Date: Feb 2004
Location: South Wales
Default 12ax7

Personally, I would go for the 6SN7gt, or the 6SL7gt if you need that extra gain, the 12ax7 aint a great valve, a bit prone to microphonics, Changed dosens of them over the years!

The 6sn7/6sl7 have a great reputation it seems, but they are an International Octal 8 pin, and benefit from DC heaters to reduce injected hum, especially in phono stages!
__________________
Das Beste Oder Nichts
  Reply With Quote
Old 11th April 2004, 12:56 AM   #10
diyAudio Member
 
Join Date: Apr 2004
Location: quezon city
Send a message via Yahoo to isak0411
Default Re: 12ax7

Quote:
Originally posted by Alastair E
Personally, I would go for the 6SN7gt, or the 6SL7gt if you need that extra gain, the 12ax7 aint a great valve, a bit prone to microphonics, Changed dosens of them over the years!

The 6sn7/6sl7 have a great reputation it seems, but they are an International Octal 8 pin, and benefit from DC heaters to reduce injected hum, especially in phono stages!
Hi, alastair
can i use 6sn7 for phono stage & 12ax7 for line stage?

isak0411
  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
Looking for a Balanced Mic Preamp w 12AX7 Ahmad_tbp Tubes / Valves 6 7th September 2012 11:37 AM
2x 12AX7 preamp fuse value gottlieb Tubes / Valves 7 18th May 2009 03:29 AM
12ax7 preamp. longji98 Tubes / Valves 20 13th September 2008 05:06 AM
12AX7 preamp project Mrpong Tubes / Valves 0 24th January 2006 11:47 AM
12ax7 preamp Antonix Tubes / Valves 4 17th November 2005 02:52 PM


New To Site? Need Help?

All times are GMT. The time now is 12:01 PM.


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