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In Reply to: Riken Resistors vs. Vintage Carbon Comps in Pilot SA-260 posted by HOK on April 24, 2007 at 20:13:50:
There is hardly any reason to use Riken except as grid stoppers, and then I'm not sure I could they were really better.Good WW on the Load is good, but minor difference, as is wirewound on the cathode good, but only minor.
Use the highest wattage you can get (usually 1W).
Follow Ups:
Grid stoppers should be Carbon comp., not anything else. A part that's both non-metallic and non-inductive is appropriate. Carbon film parts are inductive.Xicon is currently producing Carbon comp. resistors. Buy the Xicon parts from Mouser. Of course, NOS Allen/Bradley and Stackpole parts are fine.
Eli D.
Some companies now produce carbon films that look exactly like comps, and they sell them as carbon comp. I had a very frustrating experience with resistors like that in a high-power RF amplifier a few years ago. Whichever brand you choose, I strongly suggest that you purchase a few and cut them open first, just to be sure they really have a carbon core. Also, if my information is correct, Xicon may be only a distributor. If so, the actual construction and materials in their parts could change with different suppliers.
Not only inductive but also inflammable if overheated.
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