Could this tube be good for audio ? - 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 11th January 2014, 01:41 PM   #1
el156 is offline el156  Portugal
diyAudio Member
 
el156's Avatar
 
Join Date: Apr 2010
Location: ALBUFEIRA ;PORTUGAL
Default Could this tube be good for audio ?

Hi !
I have some of this CF3 pentodes ...does someone know by this curves if it could be used for áudio ?
Thanks
Attached Images
File Type: jpg CF3 curves 001.jpg (696.1 KB, 347 views)
File Type: jpg CF3 curves 002.jpg (545.1 KB, 333 views)
File Type: jpg IMG_5903.jpg (851.6 KB, 325 views)
  Reply With Quote
Old 11th January 2014, 01:51 PM   #2
diyAudio Member
 
the_manta's Avatar
 
Join Date: Nov 2006
Location: Munich, Bavaria
It's a remote cutoff tube which has a variable µ, so NO. You could try it in the 10mA range where it is abit more linear. But it is still not optimal.
Leave it to the radio enthusiasts for restoring and rebuilding. Many better tubes are around.
__________________
Терпенье и труд все перетрут
  Reply With Quote
Old 11th January 2014, 02:13 PM   #3
el156 is offline el156  Portugal
diyAudio Member
 
el156's Avatar
 
Join Date: Apr 2010
Location: ALBUFEIRA ;PORTUGAL
Quote:
Originally Posted by the_manta View Post
It's a remote cutoff tube which has a variable µ, so NO. You could try it in the 10mA range where it is abit more linear. But it is still not optimal.
Leave it to the radio enthusiasts for restoring and rebuilding. Many better tubes are around.
Thanks...i dont know what to do with them, i have some of them NIB and sealed, maybe someone here needs some to rebuild an old radio, since i dont work with rádios...
  Reply With Quote
Old 11th January 2014, 05:02 PM   #4
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
Put them on ebay so the ancient wireless people can access them.
  Reply With Quote
Old 11th January 2014, 08:22 PM   #5
Banned
 
Join Date: Dec 2013
Actually people interested in ancient wireless devices are more interested in mirrors that can be used for heliographing.

Also ancient Greeks could often send messages up to 100 miles away by the use of multiple beacon fires.
Perhaps this was the first cellular network?
  Reply With Quote
Old 11th January 2014, 08:23 PM   #6
diyAudio Member
 
Miles Prower's Avatar
 
Join Date: May 2005
Location: USA
Blog Entries: 6
Quote:
Originally Posted by el156 View Post
Hi !
I have some of this CF3 pentodes ...does someone know by this curves if it could be used for áudio ?
Thanks
There are a lot of potential audio "sleepers" out there. If you look, maybe you can find a really good audio loadline.

However, I would question why do that? These thingies are OLD, so why use them for a new project when you already know the existing stock will only be depleted?

If you have a few, then E-Bay them and you'll have enough to get some decent newer types more suitable for audio usage, and with a larger stock available. That's one of the good things about those much-maligned "Tee-Vee T00bz": there are a lot of them still out there, waiting for projects.

As the OP said, leave these CF3's to the antique radio restorers. They'll thank you for that.
__________________
There are no foxes in atheistholes
www.dolphin-hsl.com
  Reply With Quote
Old 12th January 2014, 10:15 PM   #7
diyAudio Member
 
Refugee1's Avatar
 
Join Date: Jul 2012
Location: Worksop
I will put a link on one of the radio sites for them as they are from the RF side of radio and will not work all that well for audio.
They would usually be seen in sets with wooden cabinets and very early TVs.
  Reply With Quote
Old 13th January 2014, 10:59 AM   #8
el156 is offline el156  Portugal
diyAudio Member
 
el156's Avatar
 
Join Date: Apr 2010
Location: ALBUFEIRA ;PORTUGAL
I also have some of this ones, maybe they could be usefull for someone who works in old rádios restoration. they are C/EM2 magic eye. i am sure they are quite rare tubes.
Attached Images
File Type: jpg IMG_5915.jpg (959.1 KB, 122 views)
File Type: jpg IMG_5912.jpg (963.5 KB, 114 views)
File Type: jpg IMG_5914.jpg (912.4 KB, 29 views)
  Reply With Quote
Old 14th January 2014, 12:22 AM   #9
diyAudio Member
 
Refugee1's Avatar
 
Join Date: Jul 2012
Location: Worksop
I will make a note and pass it on.
  Reply With Quote
Old 14th January 2014, 02:05 AM   #10
diyAudio Member
 
aardvarkash10's Avatar
 
Join Date: Mar 2007
Location: Auckland, NZ
I'd be keeping the magic eye tubes myself... VEry cool and can be used in a wide variety of devices including audio
__________________
"Folks, you can't prove truthiness with information. You prove truthiness with more truthiness. In a process known as truthinessiness." - Stephen Colbert, The Colbert Report
  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
Which tube Rectifier is good enough for 5902 tube amp ? calico88 Tubes / Valves 14 30th July 2011 05:15 AM
Good books or videos on audio production, audio engineering, or audio editing tunks14 Everything Else 0 15th April 2011 10:00 PM
PP Tube Biasing, how good is good enough? TheGimp Tubes / Valves 3 25th October 2009 06:24 PM
Good (tube) audio shows in the US? vax9000 Tubes / Valves 0 16th March 2008 04:11 PM
tube 8416 good for audio ??? Bernhard Tubes / Valves 4 9th January 2004 10:37 PM


New To Site? Need Help?

All times are GMT. The time now is 01:48 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