From the May, 1934 issue of the <I>Philco Serviceman</I>, page 4:<BR> <BR><B>COLOR CODE FOR PHILCO WIRING</B><P> <B>P</B>hilco has adopted the standard R.M.S. colde code as employed by various other radio manufacturers.<BR>This coloring of wires is held wherever possible, and there are only a very few exceptions where the <BR>standard coloring is not used.<BR> The chart below indicates the various colors of wires and the types of circuits in which these wires are used:<BR>__________________________________________________<P><B>RED</B> . . . . . . . . . Filaments and odd wires<P><B>BROWN</B> . . . . . . . Cathodes and grounds<P><B>WHITE</B> . . . . . . . . B+ and screens of output pentodes<P><B>WHITE</B> w/<B>BLACK</B> tracer<BR> and/or<BR><B>BLACK</B> w/<B>WHITE</B> tracer . . . . Plates<P><B>GREEN</B> . . . . . . . . Grids and screen grids<BR>__________________________________________________<BR> <BR>This may seem like a limited selection, but remember, this is 1934 and manufacturing standards are still being formed, hashed out and adopted among the many, many radio manufacturers of the day.<P>Every manufacturer's Engineering Department had the "not-invented-here" attitude to overcome as well when the industry was trying to standardize things. <IMG SRC="http://antiqueradios.com/forums/smile.gif"><P>------------------<BR>Chuck Schwark<BR><B><I>The Philco Repair Bench</I></B><BR><A HREF="http://www.philcorepairbench.com" TARGET=_blank>http://www.philcorepairbench.com</A>

Thanks I printed this out and will put it right next to my 16b on the workbench!<P>Mik<P>------------------<BR>

I understand the standard wire color codes for tube and high V stuff. What about Low V xistor radios? Am presently working on one. G.

Even after WWII, Philco continued to use some unique color codes which were different from RMA standards.

For example, here is the postwar Philco power transformer color code, which differs significantly from the RMA standard colors:

Primary windings: WHITE-WHITE

Secondary windings:
HV Secondary: YELLOW-GREEN-YELLOW
5v Rectifier filament secondary: BLUE-BLUE
Tube filament secondary #1: RED-BROWN-RED
Tube filament secondary #2: BLACK-BROWN-BLACK

Hi

Other than Philco I wouldn't go by any of those colors. The most popular standard:

Black....Primary
Red......High voltage with Red and a stripe center tap
Green...6.3 volt filament winding
Yellow...5 volt rectifier filament winding

TV transformers with extra filament windings might use a pair of brown and/or pair of gray wires for another filament winding.

These colors were used on power transformers and radio wiring. In addition output tube plate was a blue wire and B+ in general red.