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Author Topic: Eimac 4-400B in Johnson 500?  (Read 1012 times)
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KW6T
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« on: June 23, 2024, 11:52:45 PM »
I have a nice pair of Eimac 4-400B's and cannot find any specifications on them.  So far, a google search only yielded a dead link.  I am hoping they will be good spares for my Viking 500.

Any thoughts on where to find data for this tube, and/or suitability for the 500?

Thanks.
Russ
KW6T
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Pete, WA2CWA
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« Reply #1 on: June 24, 2024, 02:58:02 AM »
The Amperex 4-400B is the same as the Amperex 7527 tube

https://frank.pocnet.net/sheets/201/7/7527.pdf

Click on the picture of the tube: https://www.tubedepot.com/products/4-400b
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