Well no conductivity and no resistance on the tube pins, checked two other tubes, they had conductivity and resistance of 2.5 and 2.8 @200 ohms on DDM. On the B+ I got 135.7 on the diode and the other 138.1. Here some pics of the tube.
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Found this, that look the same, does 1/4 watt and 1/2 watt matter? Schematic show that most are 1/4, couldn't find R255.