I have a question on four tubes of the same type I just received, all four are 11BM8 for the K502 tube kit from Antique Electronic Supply (Tubes andMore.com). Two tubes were made in Korea and have a pattern where the silvering at the top of the tube is level around the circumference, but the other two tubes which were made in Japan have a silver pattern that is angled about 45 degrees. Will this maker any difference if they are used together in the same kit?
Thanks
Thanks
The "silvering" is called a getter. It's done at the time of manufacture to leach out residual gases following the first evacuation and sealing. Typically, a reactive metal is blasted out of an internal structure. Where the structure is located and how the metal is blasted out varies from manufacturer to manufacturer, thus your observation.
To see if the tubes match, compare heater current and the mu and gm at the desired operating points.
To see if the tubes match, compare heater current and the mu and gm at the desired operating points.
GO GET IT....
Hi,
In case someone's wondering about how it all goes, here is:
A CENTURY OF GETTERING...
Cheers,
Hi,
In case someone's wondering about how it all goes, here is:
A CENTURY OF GETTERING...
Cheers,
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