Need help identifying this 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 29th April 2013, 03:49 AM   #1
diyAudio Member
 
devilsindetails's Avatar
 
Join Date: May 2011
Location: 100th Meridian
Default Need help identifying this tube...

Hey Lads....

Working on an old German-made guitar amplifier and one tube has me stumped...no silkscreen markings remaining, no identification marks other than the TFK diamond stamped on the base of the glass envelope.

It is situated on its lonesome in a section marked "vibrator" some form of European equivalent to a reverb section...

There's no schematic for this strange beast but the tube complement is as follows

EZ80 Rectifier
2 x EL84
2 x ECC83
1 x EF804
1 x EM85
1 x ??? Reverb Tube?

Have done some posting on ampgarage.com but perhaps one of the diyAudio tube eagle-eyes here can identify this puppy.

I have attached a few other contextual images of the chassis and amp as well.

Thanks. Leo
Attached Images
File Type: jpg german amp2 003.jpg (496.3 KB, 164 views)
File Type: jpg german amp2 001.jpg (485.7 KB, 158 views)
File Type: jpg German Amp 036.jpg (455.1 KB, 150 views)
File Type: jpg German Amp 029.jpg (697.4 KB, 143 views)
File Type: jpg vibrator.jpg (904.5 KB, 136 views)
__________________
"A problem left to itself dries up or goes rotten. But fertilize a problem with a solution--you'll hatch out dozens." (N.F.Simpson)
  Reply With Quote
Old 29th April 2013, 05:47 AM   #2
diyAudio Member
 
Join Date: Nov 2010
old style EF86?

Quote:
Originally Posted by devilsindetails View Post
Hey Lads....

Working on an old German-made guitar amplifier and one tube has me stumped...no silkscreen markings remaining, no identification marks other than the TFK diamond stamped on the base of the glass envelope.

It is situated on its lonesome in a section marked "vibrator" some form of European equivalent to a reverb section...

There's no schematic for this strange beast but the tube complement is as follows

EZ80 Rectifier
2 x EL84
2 x ECC83
1 x EF804
1 x EM85
1 x ??? Reverb Tube?

Have done some posting on ampgarage.com but perhaps one of the diyAudio tube eagle-eyes here can identify this puppy.

I have attached a few other contextual images of the chassis and amp as well.

Thanks. Leo
  Reply With Quote
Old 29th April 2013, 06:07 AM   #3
diyAudio Member
 
Join Date: May 2007
Yes, could be a an EF86 - I just had a look at a couple of Tfk EF86s on hand and they appear to be of same construction except for colour of shield - bright nickel, not grey coated as in your pics. The EF804 and others like EF80, 184 etc are quite different in appearance, and a bit taller, so not one those IMHO.
  Reply With Quote
Old 29th April 2013, 09:17 AM   #4
Tesla88 is offline Tesla88  Italy
diyAudio Member
 
Tesla88's Avatar
 
Join Date: Dec 2011
Location: Italy
Sure is a reverb and not a tremolo/vibrato circuit ? I can't see the reverb tank ...

Anyway , the best way to find what kind of tube is it , is to look how is connected and how it works ...
  Reply With Quote
Old 29th April 2013, 12:12 PM   #5
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
That is what I always think of as the 'German' style of screened small-signal pentode. EF86, EF80 etc. come in this form. It looks quite different from the silvery Mullard/Philips style screen or the silvery (but very different) Russian style screen.

Check the pinout. At the very least that would narrow it down.
  Reply With Quote
Old 30th April 2013, 12:08 AM   #6
diyAudio Member
 
devilsindetails's Avatar
 
Join Date: May 2011
Location: 100th Meridian
Quote:
Originally Posted by Tesla88 View Post
Sure is a reverb and not a tremolo/vibrato circuit ? I can't see the reverb tank ...

Anyway , the best way to find what kind of tube is it , is to look how is connected and how it works ...
I think you are right...the german "vibrator" marking must be a vibrator circuit and not a traditional reverb section as there is no reverb tank.

I too speculated that it could be an EF86 except that it is unlike anything I have on hand and the top of the plate looks radically different to me...
__________________
"A problem left to itself dries up or goes rotten. But fertilize a problem with a solution--you'll hatch out dozens." (N.F.Simpson)
  Reply With Quote
Old 30th April 2013, 12:09 AM   #7
diyAudio Member
 
devilsindetails's Avatar
 
Join Date: May 2011
Location: 100th Meridian
Quote:
Originally Posted by DF96 View Post
That is what I always think of as the 'German' style of screened small-signal pentode. EF86, EF80 etc. come in this form. It looks quite different from the silvery Mullard/Philips style screen or the silvery (but very different) Russian style screen.

Check the pinout. At the very least that would narrow it down.
Yes, will do....
__________________
"A problem left to itself dries up or goes rotten. But fertilize a problem with a solution--you'll hatch out dozens." (N.F.Simpson)
  Reply With Quote
Old 30th April 2013, 04:41 PM   #8
diyAudio Member
 
devilsindetails's Avatar
 
Join Date: May 2011
Location: 100th Meridian
Mystery solved. The tube is an EF806

EF 806S, Tube EF806S; Röhre EF 806S ID18608, Vacuum Pentode

Thanks to everyone for your help!!!

Leon
__________________
"A problem left to itself dries up or goes rotten. But fertilize a problem with a solution--you'll hatch out dozens." (N.F.Simpson)
  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
Help identifying a Telefunken(?) tube... pyrotas Tubes / Valves 17 27th January 2011 10:25 PM
Identifying an unknown tube Rispoli Tubes / Valves 11 5th July 2008 07:51 PM
Help identifying a tube. leadbelly Tubes / Valves 6 7th April 2007 03:14 AM
Help with identifying tube showdown Tubes / Valves 1 24th November 2005 09:05 PM
Help identifying tube tester Andypairo Tubes / Valves 2 31st October 2005 12:30 PM


New To Site? Need Help?

All times are GMT. The time now is 12:42 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