[Boatanchors] Replacing 866s with 3B28s

[howard holden]

I ran 3B28's for a long time in a Valiant many years ago, had absolutely no problems with them. Good choice.

Howie WB2AWQ
  ----- Original Message ----- 
  From: WQ9E at btsnetworks.net<mailto:WQ9E at btsnetworks.net> 
  To: ke7kk at earthlink.net<mailto:ke7kk at earthlink.net> ; boatanchors at mailman.qth.net<mailto:boatanchors at mailman.qth.net> 
  Sent: Wednesday, December 29, 2010 1:09 PM
  Subject: Re: [Boatanchors] Replacing 866s with 3B28s


  Bill,

  I built solid state replacements for the 866 tubes in my Valiant and 
  Valiant II but if you want to stay with tubes the 3B28 is a better 
  choice than the original MV tubes.  You don't need an additional dropping resistor when replacing MV tubes with SS because the voltage drop is also very low with MV tubes.

  If your Valiant is early production, check the wiring between the LV 
  transformer and the 866 cathodes.  This winding has the full HV on it 
  and the early Valiants were built with standard hookup wire that tended 
  to arc and short taking out the LV transformer in the process.  If the 
  insulation on these wires is not obviously thicker than the standard 
  wiring either replace it with proper HV wire or sleeve it.

  Rodger WQ9E

  ----------------------------------------
  From: bill kipping <ke7kk at earthlink.net<mailto:ke7kk at earthlink.net>>
  Sent: Wednesday, December 29, 2010 2:22 PM
  To: boatanchors at mailman.qth.net<mailto:boatanchors at mailman.qth.net>
  Subject: [Boatanchors] Replacing 866s with 3B28s 

  Hi to the group.  I want to replace the 866 rectifiers in the Johnson Valiant with 3B28s (blue tubes are scary!). Any thoughts or experiences pro or con. TNX Bill

  New Years wish to all, may Washington DC stay out your lives and wallets in the new year.   
  ______________________________________________________________
  Boatanchors mailing list
  Home: http://mailman.qth.net/mailman/listinfo/boatanchors<http://mailman.qth.net/mailman/listinfo/boatanchors>
  Help: http://mailman.qth.net/mmfaq.htm<http://mailman.qth.net/mmfaq.htm>
  Post: mailto:Boatanchors at mailman.qth.net<mailto:Boatanchors at mailman.qth.net>

  List Administrator: Duane Fischer, W8DBF
  ** For Assistance: dfischer at usol.com ** 

  This list hosted by: http://www.qsl.net<http://www.qsl.net/>
  Please help support this email list: http://www.qsl.net/donate.html<http://www.qsl.net/donate.html>


  ______________________________________________________________
  Boatanchors mailing list
  Home: http://mailman.qth.net/mailman/listinfo/boatanchors<http://mailman.qth.net/mailman/listinfo/boatanchors>
  Help: http://mailman.qth.net/mmfaq.htm<http://mailman.qth.net/mmfaq.htm>
  Post: mailto:Boatanchors at mailman.qth.net<mailto:Boatanchors at mailman.qth.net>

  List Administrator: Duane Fischer, W8DBF
  ** For Assistance: dfischer at usol.com ** 


  This list hosted by: http://www.qsl.net<http://www.qsl.net/>
  Please help support this email list: http://www.qsl.net/donate.html<http://www.qsl.net/donate.html>