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Author Topic: Wiring or Schematic for SB 220 Transformer 54-237  (Read 3331 times)
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WD8BIL
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« on: December 02, 2010, 02:29:15 PM »

I'd like to see the wiring diagram for this tranny I have.
It has the SB 220 p/n stamped on it but I have no info.
A 1KW power tranny would be nice.

Buddly
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Ralph W3GL
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« Reply #1 on: December 02, 2010, 03:16:25 PM »



   Bud,

   That transformer has dual tapped primary's for 115/230 input
   giving it a 500 volt boost when switching  from "CW/TUNE" to "SSB"
   mode.  It is designed for voltage doubler service.

   The color codes are as follows:
    Primary 1 :   low end: Black            tap: Blk/Yellow    high: Yellow
        "      2 :        "     : Black/Green    "  : Blk/Red          "  : Blue
  
    Secondary:   High end: Red           Low end:  Red/Yellow    
  
    Wire both primary's (full windings) for 2500 volts in doubler service
     Switch to taps for 3KV doubler output.

     There's a schematic at "www.w6kan.com/sb220.html"...

     It's a nice piece for it's purpose...
    
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73,  Ralph  W3GL 

"Just because the microphone in front of you amplifies your voice around the world is no reason to think we have any more wisdom than we had when our voices could reach from one end of the bar to the other"     Ed Morrow
WD8BIL
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« Reply #2 on: December 02, 2010, 03:58:33 PM »

Thanks Ralph.
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