SB-200 users: a question.

[Kenneth G. Gordon]

Well...since I have had both my SB-200s, I have been 
having considerable difficulty obtaining 572Bs that are 
reliable and will output what they are supposed to for more 
than about a month.

I run them as I am supposed to, keeping the grid current 
well below 100 mA, but they seldom last. I don't abuse 
them, and run mostly CW. I never allow them to show 
color.

I am very seriously considering replacing my 572Bs with 
813s, or some other heavy-plate tube of about the same 
physical height.

What do others use? How long do they last in normal 
service?

I am NOT pleased... :-(

Ken Gordon W7EKB

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