[Boatanchors] G.R. 1606 A Bridge Question

[Al Jenkins W4TUK]

The General Radio RF Bridge manual parts illustration shows a picture of the location of bridge resistor R-3,a 330 ohm wire wound resistor,looking like a piece of plexiglass mounted on an L-Bracket with a solder lug on it. It reads capacitance but is  open in resistance. Is this actually a resistor?  Special made.?  Thanks, Al, W4TUK 

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