[BULK] - [Amps] tube flatulence - gettering

[Will Matney]

ZSAC = Zero Signal Anode Current

Will

Gary Smith wrote:

>Gotta ask: what is "ZASC" ?
>Gary
>WA6FGI
>
>snip
>  ----- Original Message ----- 
>  From: Steve Katz 
>  To: 'jsb at digistar.com' 
>  Cc: Amps at contesting.com ; amplifiers at qrq.us 
>  Sent: Friday, November 19, 2004 10:11 AM
>  Subject: RE: [BULK] - [Amps] tube flatulence - gettering 
>
>
>  Aren't all 3-400Zs now 30+ years old?  -WB2WIK/6
>
>  > Question:
>  > 
>  > I was given a homebrew single 3-400Z amplifier which works but I noticed
>  > with ZSAC the top of the glass envelope has a very faint blue hue when
>  > looking across the top of the tube envelope.  When looking down at the top
>  > of the tube I don't see this color, only when looking across the top -
>  > keying CW does not pulsate the color, the blue hue is the same regardless
>  > of output power.  I have a couple other old junk clunker 3-400Zs that do
>  > the same.
>  > 
>  > Is this normal or is it an indication of gas?
>  > 
>  > I have some 8163 Amperex 3-400Z in a Drake L4 that do not exhibit this
>  > coloration, ever.  The Eimac 3-400Z tubes do, even after having been used
>  > to produce enough output RF to turn the anode reddish-orange for 10-15
>  > seconds.  Or does the getter not getter that quickly...
>  > 
>  > 
>  > 
>  > thanks
>  > 
>  > 73 Jason N1SU
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