[BULK] - [Amps] tube flatulence - gettering

[Gary Smith]

Thanks. I have learned yet another acroymym. 

Gary
WA6FGI

snip 
  ----- Original Message ----- 
  From: Will Matney 
  To: amps at contesting.com 
  Sent: Friday, November 19, 2004 11:10 AM
  Subject: Re: [BULK] - [Amps] tube flatulence - gettering


  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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