Anyone familiar with this tube? It's labeled as 'CSF' brand, 6080S, beneath that is a 'H'. All I could find was that it was apparently produced by a (subsidiary of) Thalesgroup, a large French aerospace/defence conglomerate. And a very tenuous link to Thomson tubes (also French). Wonder about the 'S' designation, maybe some indication that they were approved for military use. Sitting in a hotel room now so can't audition them but curious, was very positively impressed by the sound of some NOS 1965 produced CIFTE 6080WA's which I tried (apparently CIFTE/Mazda). Got them dirt cheap and very impressed with the sound, nice, detailed, good spacing between instruments and quite neutral.
Edit: found some more info on the tube, it was made by the Compagnie Générale de télégraphie sans fil in France, designed to meet mil. Standards ( resistance to at least 5 shocks of 450 G, 2000 1-minute interval on-off cycles, vibration etc). Curious to hear it.Edited by Xenophon - 4/2/14 at 12:47am