[Johnson] Slightly off topic question concerning mercuryvapor rectifiers

[Charles Ring W3NU]

Roy Morgan wrote:

>
> 1) Buy all examples of these tubes you find at hamfests and the
> like.  Cultivate the habit of digging way down in boxes of loose tubes to
> find any lurking there.. Memorize the shape and appearance of the
> lowly-looking 816 so you don't miss any of them.  Further expertise in this
> area will let you spot and recognize old and odd tubes of this sort like
> the 866 (non-A), even the globe variety from the 1920's and 30's, and one
> or two tubes similar to the 866 not made since the late 1930's.  More

I have a globe style Amperex 866-A, which has always made me wonder just how
old any non-A 866's must be. I have never seen one.

73 de W3NU