Eimac 3-400Z tubes in Heathkit Sb--220 P.A.

[] William Ward]

Joe,

For a brief comparison of the 3-400Z and 3-500Z and similar tubes, go to http://www.rfparts.com/tubecomp.html.  Basically, the differences in the 2 tubes is available output power, 400 vs 500 watts.  Here's a quote from referenced web page:
"EIMAC 3-400Z   The Original grounded grid triode introduced in the early 1960s. Now obsolete part number. Power dissipation: 400w.

EIMAC 3-500Z   Later version of 3-400Z having larger fins for the increased power dissipation of 500w. Slightly larger body requires minor changes to fit where 3-400s were used. Requires heat dissipating connector."

Naturally, when using the 3-400Z tubes in place of the 3-500Zs, be careful not to exceed recommended plate current for maximum output.  

Bill, W4PCK



  ----- Original Message ----- 
  Wrom: SCRTNH
  To: HEATH at LISTSERV.TEMPE.GOV 
  Sent: Saturday, October 04, 2003 7:22 PM
  Subject: Re: Eimac 3-400Z tubes in Heathkit Sb--220 P.A.


  Has anyone out there ever used a pair of Eimac 3-400Z tubes in a SB-220
  Power.
  amplifier instead of the 3-500Z tubes????  Any problems?? Want to use on
  CW only!!

  73 de Joe w0tut

-----------------------------------------------------------
This list is a public service of the City of Tempe, Arizona
-----------------------------------------------------------

Subscription control - http://www.tempe.gov/lists/control.asp?list=HEATH
To post - HEATH at LISTSERV.TEMPE.GOV
Archives - http://interactive.tempe.gov/archives/HEATH.html