Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Are these "United National" tubes made by EI?
Are these "United National" tubes made by EI?
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 8th March 2018, 09:13 AM   #11
nzoomed is offline nzoomed  New Zealand
diyAudio Member
 
Join Date: Aug 2015
Quote:
Originally Posted by dewy1 View Post
thats an Ei tube!




2A1 ist the Ei factory for ecc83/12ax7 tubes


3A1=ecc81/12at7


a semicircle with a dot is the ei factory code


i newer saw an ei tube code list ,the number 6 can be anything between 1966-86!

A and L are the months i guess


this is from the EI Website:


"Ei RC" operates as a subsidiary of Elektronska Industrija (Ei) Holding Corporation, Niš, Yugoslavia. The factory has been founded in 1951 using Telefunken technology. In 1959 Philips technology had been adapted and production was mainly devoted to the radio and TV tubes. There were 126 tybe types (NOVAL, OCTAL, MAGNOVAL) in production with overall capacity of 12 millions pcs/yr. In the mid eighties this production programme has been abandoned due to the technological obsolence and lack of the market.


dewy1
thats good to know, i expect ive got some good quality early pre war tubes here from the 70's.
Shame the factory is not making them anymore, i think they stopped mid 2000's
  Reply With Quote

Reply


Are these "United National" tubes made by EI?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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
5R4GY "RCA","FOUR PIECES" DOUBLE GETTER, USA 1945 made, mil-spec NOS NIB tubes ! vmed_cha_gr Vendor's Bazaar 0 15th September 2016 06:27 AM
1 "Foster FE103A Family" 4" Full Range Driver, Alnico Magnet, Made In Japan ~1968 cc72 Swap Meet 0 11th September 2015 06:57 AM
What is the difference between "rectifier tubes" and "power tubes" plig88 Tubes / Valves 16 6th January 2013 05:58 AM
"How it's made" vacuum tubes.. Remlab Tubes / Valves 8 20th May 2012 02:43 PM
so, who made General Motor's "AUTRONIC EYE" tubes? aletheian Tubes / Valves 11 18th December 2005 07:20 PM


New To Site? Need Help?

All times are GMT. The time now is 06:40 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki