Tubes Asylum: KT90 was NOT based on the EL519 by Vanimal Manley Questions about tubes and gear that glows. FAQ

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Posted by Vanimal Manley (M ) on November 8, 2002 at 10:31:34

In Reply to: Operational life is highly variable... posted by mb-de on November 8, 2002 at 07:37:19:

Try again: EL156 .

This was the tube that DM brought to the Ei factory's attention. He wanted an AUDIO tube, a super KT88/6550-type, higher plate dissipation, tolerant of high voltages, octal based, no plate cap, and definitely NOT a horizontal deflection TV tube.

If he wanted TV tubes we could have gotten EL519's cheap all day long and saved oruselves all the hassle.

While it is true that Ei were making EL519, and the innards might appear to look similar, it is very important to make the distinction that the KT90 design was NOT based on this tube.

As for tube life, that will depend on the amplifier design, and plain ol' good luck. I have documented cases of KT90's running +50,000 hours in recording studios in LA, in our amps, never switched off, in a dedicated air-conditioned rack.
Cheers, EveAnna Manley, Manley Labs

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