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I believe they are in series with tube filament strings? Riders lists them as R454,R455 - Glowbar, 75 ohm, GE #RRW041. So they are thermistors and will drop in resistance as they warm up. 75 ohm would be their hot rating.
Last edited by Kevin Kuehn; 11-15-2015 at 10:03 AM.
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