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New Ei KT90 & 6CA7 Tubes

I own a new, never used, pair of Ei KT90's. There is a sticker on the box that has 50/51 on one tube box, and 50/44 on the other tube box.
In addition, I own a new, never used, pair of Ei 6CA7's. There is a sticker on the box that has 30/28 on one box, and 30/41 on the other box.
All four boxes are yellow with red 'Ei' writing, with INDUSTRIJA written also in red. There's a blue band at the bottom of the box that has 'MAGNOVAL' written in the blue band.
These tubes have been sitting, unused in my listening room. Are these worth anyhting?
louisl

Showing 1 response by louisl

louisl OP
179 posts
 
Thanks Mechans!
I did look more closely at the KT90's for type III designation. There is stamped on the tubes, in very small white letters, the following disignation:
B3B
Q3D
Is this the type III variation mark that you are refering to?
Lastly, should I try and sell these things or swap them the next time I purchase new tubes? If so, what do think the KT90's and the 6CA7's are worth? Any idea? Anybody?
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