Wind (Thermionic?) noise, and other strange sounds - 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 29th January 2012, 12:04 AM   #1
wicked1 is offline wicked1  United States
diyAudio Member
 
wicked1's Avatar
 
Join Date: Jan 2008
Location: Midwest
Default Wind (Thermionic?) noise, and other strange sounds

My phono (p2p aikido) started making a noise that sounds like a microphone picking up an intermittent breeze. It was one channel and I tracked it down to one of my tubes. Is that a common symptom of aging tubes?
It made another very strange sound.. The tubes are shielded. When I removed the shield on this tube it went bbbzzZZZZZzzzp. Basically, a strange buzz that increased in volume for about 2 seconds, and then decreased and stopped. I can put the shield back on, then remove it again, and every time I remove the shield it makes that 2 second long buzz.
What is that?

And last, is there any way to tell when tubes are going bad w/out a tester? I've been suspecting I'm hearing some distortion, but it's nothing major. But, I'm second guessing myself, as this hobby has ruined music for me .. I always hear distortion, and it's usually in the recording (a lot of modern music is all distorted.. entire albums sound quite bad, and a lot of old music (60's rock records) have distortion at all the loud parts) so.. maybe it's just my records.
  Reply With Quote
Old 29th January 2012, 12:47 PM   #2
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
Could be RF oscillation, or bad microphonics.
  Reply With Quote
Old 29th January 2012, 03:47 PM   #3
Jebem is offline Jebem  Portugal
diyAudio Member
 
Jebem's Avatar
 
Join Date: Dec 2011
Location: Lisbon
An excessive heater to cathode voltage differential can create these problems in one or another tube, depending on the batch quality and manufacturer. Don't trust too much the datasheets. They have been written by manufactures that want their tubes to look nice.

Assuming all was well before this issue, and as You have identified the root cause on one single tube, I would just replace it and see.
__________________
If You need something done properly, do it yourself (and ask help from DIYaudio... )
One of my SE 211 tube amps: http://sites.google.com/site/sunajeb...ificador-211se
  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
LT108 Oscillation sounds like tube rush/white noise Hearinspace Tubes / Valves 5 31st July 2010 05:52 PM
Strange sounds when power down gainclone synthius Chip Amps 52 11th April 2008 07:58 PM
Strange noise...? Skorpio Solid State 16 6th August 2007 06:21 AM
strange noise from right channel keyser Everything Else 15 2nd May 2005 10:14 PM
Port Noise, Wind Speed................. OMNIFEX Multi-Way 20 13th April 2003 04:27 PM


New To Site? Need Help?

All times are GMT. The time now is 09:04 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