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In Reply to: Ei KT90 Series Questions posted by jbrrp1 on April 18, 2011 at 19:44:19:
hello jb,here is a link which helps to recognize KT90 types:
http://www.manleylabs.com/galleria/KT90.html
what i can say is that i felt no sonic difference between type II and III.
type II seems to be the best one in terms of material, production tolerances and quality control though. i recently purchased a flock of type IV which had run in a JADIS amp for years. not heard them yet but they are still in great condition showing over 50 mA in my Funke W19 tube tester. even though jadis once equipped their amps with type IV i would not hesitate to use them in my gear if i had not II and III types available....to use the EH KT90 reissue makes no sense - my information is that the EH´s will surely not sound as the vintage types.
cheers
N.
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Follow Ups
- RE: Ei KT90 Series Questions - Nunki 04/19/1100:35:56 04/19/11 (1)
- RE: Ei KT90 Series Questions - Fishfood 08:10:17 04/20/11 (0)