[patrician56]

Hi IamZoot,

If you take a look at the Philco parts catalogs (In the Philco Library - tab at the top of the page - then under the PARTS tab) and then look at the resistors listed (I was looking at the 1936 Philco parts catalog - pages 8 & 9) you will find that all but 2 of the cartridge type (carbon - dog-bone) resistors for all of the wattages listed (1/4w, 1/2 w, 1w, 2w, &3w) have ohm values above 1,000 ohms.

Page 9 lists the wire-wound "flexible" resistors. All but 5 had ohm values across the different wattage values (1/3w, 1/2w, 1w, and 2w) between 2.5 ohms and 1,000 ohms.

So, it appears that if they needed a resistor with a value between 2.5 and 1,000 ohms, they chose a wire-wound resistor and if the requirements were for a resistance between 1,000 and 10,000,000, they went with the cartridge type.

I believe that I read somewhere that until the mid '30's carbon resistors with a low ohm value were not that good so the wire-wound flexible resistors were used.
Good luck with the project!
Fran Mayer