Quiet Tube - 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 30th March 2007, 04:34 AM   #1
diyAudio Member
 
Join Date: Feb 2006
Location: Malaysia
Default Quiet Tube

Hi guys,

I am looking for non-microphonic, quietest 9-pin twin triode tube. As I am frustrated from differentiating tube (internal) noise and other externally generated tube oise.

Please kindly recommend


Thanks
__________________
Audio_Idiot
  Reply With Quote
Old 30th March 2007, 04:54 AM   #2
diyAudio Member
 
rcavictim's Avatar
 
Join Date: Jun 2004
Location: Next to an open wormhole NW of Toronto
Try a 2N6CG7.
__________________
On April 01,2012, my radioastronomy Project TARGET SETI search succeeded. The signal came via extradimensional subspace, not radio waves. I now get a lot of 'visitors'. I took my avatar pic of one friend watching me in my work yard from just 20 ft. away.
  Reply With Quote
Old 30th March 2007, 07:42 AM   #3
diyAudio Member
 
Geek's Avatar
 
Join Date: Sep 2004
I have a box full for JAN GE 5751's that fit that description
  Reply With Quote
Old 30th March 2007, 07:53 AM   #4
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
Quietest in what circuit? Context is everything.
__________________
You might be screaming "No, no, no" and all they hear is "Who wants cake?" Let me tell you something: They all do. They all want cake.- Wilford Brimley
  Reply With Quote
Old 30th March 2007, 08:08 AM   #5
oshifis is offline oshifis  Hungary
diyAudio Member
 
Join Date: Mar 2004
Location: Budapest, Hungary
I used Tungsram PCC88 for moving coil amplifier, and I could reach 60 dB S/N ratio (A weighted). E88CC is also very good, although a bit less quiet.
  Reply With Quote
Old 30th March 2007, 08:18 AM   #6
Tweeker is offline Tweeker  United States
diyAudio Member
 
Join Date: Dec 2004
Location: Cincinnati, Ohio
I have some 6L6s with white powdery getters. They are very quiet, but octal.
__________________
Be sure your foil hat has a good low impedance ground.
  Reply With Quote
Old 30th March 2007, 08:20 AM   #7
diyAudio Member
 
Join Date: Feb 2006
Location: Malaysia
Quote:
Originally posted by SY
Quietest in what circuit? Context is everything.

As ground cathode.

Thanks
__________________
Audio_Idiot
  Reply With Quote
Old 30th March 2007, 08:28 AM   #8
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
OK, that's one bit. Signal level? Source impedance? Load? EQ? Noise weighting? You've barely scratched the surface.
__________________
You might be screaming "No, no, no" and all they hear is "Who wants cake?" Let me tell you something: They all do. They all want cake.- Wilford Brimley
  Reply With Quote
Old 30th March 2007, 08:45 AM   #9
diyAudio Member
 
Join Date: Feb 2006
Location: Malaysia
Input signal the usual 1Vrms, Don't know much about noise weight of the input signal... will just have to rely on the meanufacturer's "usual standard".

I recon the PS noise ripple for the tube is about 0.04V but then I've yet to regulate the PS, so lots of room for improvements, I actually tried using noise injection at the cathode for noise cancellation, but since I do not have access to a scope so no maeasurements... This is the rational of asking for a quiet tube so that I could at least identify and sort out my "others" problems...

As for the stage gain, I really is not particular about it, as I'll probly cascade into anothe gain stage. I'll be happy with 10~30x.

I tried 6C45p, then to 6922 then, 6N1P, then 5965 then5842, then.... I'd lost trrack... but the sound is infested with a little hum which is only audioble 2" away, Also, a tat of white noise and which will getting to my nerves when listening in the depth of the night...

I hope these info got my skin scratched:-)

Cheers
__________________
Audio_Idiot
  Reply With Quote
Old 30th March 2007, 03:36 PM   #10
Tweeker is offline Tweeker  United States
diyAudio Member
 
Join Date: Dec 2004
Location: Cincinnati, Ohio
Other things to be checked are heater dress and EMI (such as from transformers or chokes.) If the hum fundamental is 50/60hz and not 100/120 this is an indicator of heater or xfmr related noise.

You may also have dirty power and/or RFI.
__________________
Be sure your foil hat has a good low impedance ground.
  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
How quiet is dead quiet? pchw Tubes / Valves 36 22nd November 2007 04:36 AM
Gainclone too quiet? drfrink24 Chip Amps 13 14th March 2005 08:57 PM
Quiet here, isn't it? pinkmouse The Lounge 24 8th February 2005 08:29 PM
How quiet will it be? MMicke Chip Amps 8 12th July 2003 08:26 PM
Too quiet! grataku Everything Else 14 14th February 2003 04:39 PM


New To Site? Need Help?

All times are GMT. The time now is 09:17 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