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In Reply to: RE: My New NOS tubes are overheating I think posted by Jim McShane on December 22, 2014 at 16:35:26
Hey Jim - How many versions of the Ei KT90 were there? I read somewhere they had a type IV.
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The type III was made with two different getter patches (a.k.a. "pills") - one was round and the other was square. EveAnna Manley called them types III and IV, but since the shape of the getter was the only (and very minor) difference I regard them all as type IIIs.
Gotcha - Thanks for the update. One last question - was it the early or late production type III's that had the 'red plate' symptom?
Thanks
George
Later production. The problem began about the same time as the NATO intervention in the Balkans.
Thanks again Jim. You cleared up a lot for me
George
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