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In Reply to: RE: What about these? posted by Michael Samra on April 20, 2014 at 22:19:37
Mind if I ask as well? Just bought these after following your posts. Look like they are dated 1981 and I read elsewhere that even '81 tubes are good.
Follow Ups:
reassuring and helpful.
How come those photos don't have the "OTK" approval stamp? In what era did these stamps exist?
Thanks!
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Guys,
OTK was the soviet military procurement office testing lab(s) at the factories. Literally OTK means quality control department or some such.
The OTK stamp meant the tube passed inspection for military service. The office went out of fashion with the soviet union. Current production and post soviet production should not have the OTK stamp, unless the factory kept them and continued to use them anyway.
Ciao T
Sometimes I'd like to be the water
sometimes shallow, sometimes wild.
Born high in the mountains,
even the seas would be mine.
(Translated from the song "Aus der ferne" by City)
.
.
ALL tubes shipped from the factory have passed the inspection, sometimes the mark might be not obvious.
Where you have the significant difference, is in the mil spec acceptance stamp, usually a small star - those tubes are superior, otherwise you have the normal, commercial grade tubes.
...especially on the second tube from right, it is the diamond shaped logo with letters near it.
...I see this on a lot of Russian tubes inc current mfg.
I think you are correct. OTK or not 'IF' the seller is properly testing them..a big if..the tubes should IMHO be fine.
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