this is EL34 tube of what model?

vuthecuongjapan · 22nd May 2012, 12:31 PM

Hi all,
I'm totally noob to tube. I purchased dynaco st-70 rebuilt by will vincent.
I have 1 tube probably russian el34 not lighted up at all.
Could you please check my attached file and tell me this tube is of what model?
Ex: svetlana or mullard or something?
thank you very much

kevinkr · 22nd May 2012, 03:11 PM

Looks like some rather old Chinese (Shuguang made) EL34 I have.. These particular ones have proved unreliable.

DF96 · 22nd May 2012, 03:18 PM

The very rounded end to the glass suggests modern manufacture. The rather uneven anode spot welds says "China" to me.

Rod Coleman · 22nd May 2012, 05:52 PM

The round-top envelope, the spurred micas, single-halo getter ring, big flag grid coolers, anode apertures and base are all very like the JJ EL34.

The marking does burn off these, when overheated.

That picture shows a worn-out example!

vuthecuongjapan · 23rd May 2012, 12:35 AM

Quote:

Originally Posted by Rod Coleman

The round-top envelope, the spurred micas, single-halo getter ring, big flag grid coolers, anode apertures and base are all very like the JJ EL34.

The marking does burn off these, when overheated.

That picture shows a worn-out example!

I'm sorry my english is bad. You meaned mine looks like JJ EL34?
Thank you

DF96 · 23rd May 2012, 08:49 AM

Rod thinks it is a JJ. I think it is probably Chinese.

Rod Coleman · 23rd May 2012, 10:18 AM

Quote:

Originally Posted by vuthecuongjapan

I'm sorry my english is bad. You meaned mine looks like JJ EL34?
Thank you

Yes.... I think it looks like JJ EL34.

I am sure that Your EL34 is **NOT** Russian - Svetlana or ElectroHarmonix (=Reflektor).

There are many Chinese versions - maybe it is Chinese.... but JJ EL34 is my best guess.

vuthecuongjapan · 23rd May 2012, 11:50 AM

Thank all of you very much

britishaudioslovakia · 28th May 2012, 09:03 PM

this is slovak tube

JJ-Electronic - Vacuum tubes, Capacitors, Amplifiers - Home

formerly TESLA

22nd May 2012, 03:11 PM	#2
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	Looks like some rather old Chinese (Shuguang made) EL34 I have.. These particular ones have proved unreliable. __________________ "Extraordinary claims require extraordinary evidence." - Carl Sagan

28th May 2012, 09:03 PM	#9
britishaudioslovakia diyAudio Member Join Date: Nov 2009	JJ this is slovak tube JJ-Electronic - Vacuum tubes, Capacitors, Amplifiers - Home formerly TESLA

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22nd May 2012, 03:18 PM	#3
DF96 diyAudio Member Join Date: May 2007	The very rounded end to the glass suggests modern manufacture. The rather uneven anode spot welds says "China" to me.

23rd May 2012, 08:49 AM	#6
DF96 diyAudio Member Join Date: May 2007	Rod thinks it is a JJ. I think it is probably Chinese.

23rd May 2012, 11:50 AM	#8
vuthecuongjapan diyAudio Member Join Date: May 2012	Thank all of you very much