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

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


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.

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
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