THE OLD DAYS and DOC KD4E

[RAY FRIESS]

I know..   I caught my mistake and have corrected it several times now.  HI HI
Ray
  ----- Original Message ----- 
  From: Glen Zook<mailto:gzook at YAHOO.COM> 
  To: BOATANCHORS at LISTSERV.TEMPE.GOV<mailto:BOATANCHORS at LISTSERV.TEMPE.GOV> 
  Sent: Friday, August 24, 2007 8:58 AM
  Subject: Re: THE OLD DAYS and DOC KD4E


  The SB-200 uses 572B tubes, NOT 829B!

  The 829B dates from World War II and was designed for
  VHF operation.  It is a dual tetrode.  It has a plate
  dissipation of up to 40 watts ICAS without forced air
  cooling.  With forced air cooling that goes up to 45
  watts.

  The 572B is a triode that basically is equivalent to
  two 811A tubes in the same envelope.

  Glen, K9STH


  --- RAY FRIESS <rayfrijr at msn.com<mailto:rayfrijr at msn.com>> wrote:

  Are you sure Glen?  An SB 200 uses a pair of 829B
  tubes.  I've been told you can't put a pair of 811
  tubes in there because the power supply is too much
  for 811s.   On the other hand, a Collins 30L1 uses
  four 811 tubes and many hams have put in two 829B
  tubes in place of the four 811s and they report the
  30L1 purrs like a kitten, hardly knowing the 829B
  tubes are there.. and they last practically forever.









  Glen, K9STH

  Website:  http://k9sth.com<http://k9sth.com/>


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