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RE: EI Kt90

Posted by Mendel (A) on August 6, 2014 at 07:30:59

In Reply to: RE: EI Kt90 posted by Jim McShane on August 6, 2014 at 06:01:41:

Thanks for the link Jim! Been trying to find that for a while. Best way to determine what type of EI KT90 you have.
IMO the EI KT90 is still the best KT88/6550/KT90 ever made, although I have not heard the Black plate Tung Sol's. Sorry guys, but the current Genelex and EH tubes do not compare.
Bob, these tubes are legendary for their longevity. The three good ones are very likely still strong. Try to determine which type you have and find a fourth one. The type 2 are the easiest to identify with all the weld marks on the plates. Type 1 are cooler biasing so probably won't work as well with the others in a push/pull amp. A good type 3 should work with a good type 2, although it would be better to have 4 the same type.
Can you post a picture of the ones you have?

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