Tubes Asylum

NOS Ei Kt90 type ii value?

173.47.114.226

www.records

I have a quad of the above tubes and am considering selling them due to not having any amp that can use them. I can't seem to find any fairly recent prices of their value. They have not been tested, but they will be before selling them. I figure they need a better home when they can be enjoyed instead of sitting in a box. I appreciate any help.
If these were yours what would be a fair price?

Edits: 11/25/24 11/25/24

Follow Ups:

RE: NOS Ei Kt90 type ii value? - Jim McShane 19:31:02 11/25/24 (3)
They were last made in the early 1990s and have been in VERY short supply for a number of years now, so there's been even fewer sales.

I am fortunate enough to have about 40-50 NOS Ei KT-90 type I and type II in my personal stash. i just sold a NOS "near matched" quad of type IIs a few weeks ago to a long time customer, and they weren't cheap! If you want more info drop me a note.

Also - if those tubes have been sitting unused for a long time then they may be a bit gassy. The tubes I sold were run in by me for about 8-10 hours at 465 volts on the plate and screen with a cathode current of 80-85 ma. After that "re-burn in" they were ready to use. BTW - that tendency to be gassy is not unique to the Ei KT-90s. It can occur in almost any tube under the same circumstances.

They are (IMHO) simply outstanding tubes - be SURE you want to let them go!
- RE: NOS Ei Kt90 type ii value? - www.records 20:24:17 11/25/24 (2)
  Thanks for the excellent info Jim. I appreciate you taking the time to reply. I have thought about selling them for many years because I don't have an amp that can use them. I am 71 and haven't done any changes in my system for nearly 20 years and am still happy with it. So they might as well be enjoyed by someone. I have read they are excellent tubes.
  - RE: NOS Ei Kt90 type ii value? - Jim McShane 10:34:43 11/26/24 (1)
    I know the feeling! I'll be 74 on my next birthday, and the march of time has put enough of a damper on my activities that I've finally realized that many of the projects I had hoped to work on won't ever be even attempted. That's why I am exiting the tube sales part of my business and selling off my remaining tube stock. But I still listen to music on occasion, and putting the Citation II amp and the KT90 Ei together is definitely a marriage made in heaven. So I'm glad to have the '90s I have on hand.
    
    They are GREAT tubes!!
    - RE: NOS Ei Kt90 type ii value? - www.records 12:37:21 11/26/24 (0)
      Thank you Jim. I hope you and yours have a wonderful holiday season. You have been very helpful!

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