[TenTec] Centurion Amplifier history

[Kim Elmore]

Ah, yes! That much I'm familiar with. For example, the older 3-500z anodes had zirconium on their exterior surface that acts as a getter when it's hot enough (glowing red). W8JI's pages are  excellent.

Kim N5OP



On Mar 16, 2012, at 5:11, carboyhat at juno.com wrote:

> Kim, Check out W8JI.com and go down to vacuum tubes in amplifiers
> article.  He gets into the topic of
> activating the 'getter' in tubes to remove oxygen.  
> 
> Bob, AA4AI, Watkinsville GA
> -------------------------------------------------------------------------
> -------------------------------------------------------
> On Thu, 15 Mar 2012 12:54:36 -0700 (PDT) Kimberly Elmore
> <cw_de_n5op at sbcglobal.net> writes:
>> I've heard all sorts of variations on "burn-in." Is the appropriate 
>> burn-in 
>> different for thoriated tungsten cathodes vs. oxide cathodes? What's 
>> an 
>> authoritative recommendation?
>> 
>> Kim N5OP
>> 
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