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...
