[AMRadio] Step Start

uvcm inc. uvc1 at verizon.net
Tue Dec 12 12:23:36 EST 2006

Mercury ref tubes of all types have mercury that sticks to the glass and
components inside.
Depending on the brand, type and year made the mercury deposits very a great
This is not a bad thing. If the tube has not been used for a while or has
been stored on its side, it is best to COOK THEM FOR A FEW HOURS BEFORE
The 3B28 is a newer style and a better ref tube; it also has mercury in it
but less.
If you need any more info be glad to help. 
I have several patents in mercury vapor designs

those flakes in your 866s are mecury.  if they haven't been run in a  while 
you should let them sit with just the filaments on for a while, to make
the stuff gets where it needs to be. They look nice, but the mercury  vapor 
rectifiers need to be treated well especially after a long idle  period.
can direct sub a 3B28 argon rectifier tube, and not  have to worry about the

866s. They don't glow as much, but are more tolerant  tubes.

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