THE OLD DAYS and DOC KD4E

[RAY FRIESS]

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.
Ray
  ----- Original Message ----- 
  From: Glen Zook<mailto:gzook at YAHOO.COM> 
  To: BOATANCHORS at LISTSERV.TEMPE.GOV<mailto:BOATANCHORS at LISTSERV.TEMPE.GOV> 
  Sent: Thursday, August 23, 2007 9:39 PM
  Subject: Re: THE OLD DAYS and DOC KD4E


  Don't you mean the other way around?

  A pair of 811 tubes can take a whole lot more power
  than an 829B.  The plates in an 829B would melt long
  before those in the 811s.

  Glen, K9STH


  --- RAY FRIESS <rayfrijr at MSN.COM<mailto:rayfrijr at MSN.COM>> wrote:

  One day, they wired up a pair of 1625 tubes to see how
  much power they could get out as an amplifier. They
  hooked up enough voltage to see if they could get a KW
  out.   The plates went RED HOT glowing ...  and
  promptly melted. It was kind of like putting a pair of
  811 tubes in a circuit designed for 829B tubes.









  Glen, K9STH

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


         
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