Thanks mep. I don't have any paperwork but the tubes are in the original factory box and the box does say "Laboratory Matched Pair" While the box does not look pretty the tubes are in pristine condition and look like they just came out of the factory.
When you say "valuable" are we talking about a price range of $500 or more? I don't expect to get full price but then I don't want to give them away either. Thanks folks.
My father-in-law passed away back in 1986. He had a large collection of what appears to be radio and tv tubes, mostly NOS. However, in that collection was a box I found interesting. It was Mullard EL37 laboratory matched pair of tubes. Box did not look that great but when I opened it the...