[BULK] - [Amps] tube flatulence - gettering

[Gary Smith]

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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