[Amps] Unknown 2m 2x4cx250b design?

[kenw2dtc]

Einar,
You description sounds like a homebrew amp scaled down from the popular two 4CX250 K2RIW 432 mHz amp from around 1972.  The 144 mHz amp was made of two standard aluminum boxes fastened together with the openings at the top and bottom for chassis lids.  The grid was also a strip line that was skinny and in some cases it was longer than the chassis and folded back upon itself.  The stripline and tuning flapper caps were described but there were no photos.

Could this be your amp?

73,
  Ken W2DTC





  ----- Original Message ----- 
  From: Einar Persson 
  To: amps at contesting.com 
  Sent: Thursday, March 06, 2003 3:05 AM
  Subject: [Amps] Unknown 2m 2x4cx250b design?


  Hi all
  I have a half built 2m  2x4cx250 project on the bench.
  It is a strip line type, like the ARCOS 2x4cx250 amplifier I've been
  using
  for many years, with some differences.
  It is built many years ago (>20?) by a local ham, but he remember almost

  nothing about it.
  Most of it is built with fiber glass circuit board and the main
  differences from
  the ARCOS are:
  1. This one uses receiving type sockets with a home-brew screen
  capacitor
      made from fiber glass circuit board. (Contact springs around the
  tube screen ring)
  2. The strip line isn't as wide (100 mm) as in the ARCOS so the tubes
  sits closer together.
      Strip line length is 250 mm.
  3. The chimney is like a box around both tubes, made of glass fiber
  circuit board
      with most of the copper taken away.
  4. Air is blown into the cathode compartment

  Is there anyone on this list who knows if this is a known/published
  design?

  Einar, SM3MXR


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