EL34 identification

amperex · 7th September 2005, 01:26 AM

What are these EL34 tubes bought in the early 1970s? Some state United & others Amperex. Plates are with two grid access rectangle hole spacing that match up to only the older RFT. No codes exist on the glass. States 'Made in USA' (thats not likely).

Amperex, Telefunken, Japan, all Russian & all Chinese I could find doing a Google search have different rectangle hole spacing. These tubes have a top & side ring type getter. The top of glass is fairly flat & smooth.

TheGatesOfFate · 7th September 2005, 10:11 AM

Hi Amperex,
I have a big "collection" of El34s. Today I am a little busy, but tomorrow I'll check to find if something is similar to your photo.

Btw I know there is a big mess with United Electron.
see, for example: http://www.univalve.net/forums/viewt...=99&forum=4&11
and: http://www.allaudios.org/detail-7209756.html

Cheers.

TheGatesOfFate · 9th September 2005, 12:31 PM

Hi amperex,
None of my EL34 is similar to photo.
I am sorry...can't help.

cerrem · 9th September 2005, 04:45 PM

Amperex....
I would "guess" that those are German EL34 tubes based on internal geometry.... The outfit that bought them and relabeled them must have left the "MADE IN USA" on the screening process... Might have been too much of a pain to remove it and possibly they could have been under the gun to get thier products out quickly to satisfy a contract/bid.... UNITED ELECTRON sounds like a relabel.... EL34 Tubes that don't measure up for AUDIO applications work great for pass elements in voltage regulators....

Chris

7th September 2005, 10:11 AM	#2
TheGatesOfFate diyAudio Member Join Date: Jul 2004 Location: Monterubbiano(AP) - Italy	Hi Amperex, I have a big "collection" of El34s. Today I am a little busy, but tomorrow I'll check to find if something is similar to your photo. Btw I know there is a big mess with United Electron. see, for example: http://www.univalve.net/forums/viewt...=99&forum=4&11 and: http://www.allaudios.org/detail-7209756.html Cheers. __________________ ...if a man desire to laugh, must be ready also to cry.

9th September 2005, 12:31 PM	#3
TheGatesOfFate diyAudio Member Join Date: Jul 2004 Location: Monterubbiano(AP) - Italy	Hi amperex, None of my EL34 is similar to photo. I am sorry...can't help. __________________ ...if a man desire to laugh, must be ready also to cry.

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9th September 2005, 04:45 PM	#4
cerrem diyAudio Member Join Date: Jun 2005 Location: San Diego, CA	Amperex.... I would "guess" that those are German EL34 tubes based on internal geometry.... The outfit that bought them and relabeled them must have left the "MADE IN USA" on the screening process... Might have been too much of a pain to remove it and possibly they could have been under the gun to get thier products out quickly to satisfy a contract/bid.... UNITED ELECTRON sounds like a relabel.... EL34 Tubes that don't measure up for AUDIO applications work great for pass elements in voltage regulators.... Chris

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