[mikethedruid]

I found some higher resolution photos of the label for your radio on ARF. Looking at the parts list, there are only three resistors which are high enough wattage to be the one pictured. One is R4, a 15K, 2 watt resistor. Another is R13, a 160 Ohm, 1 watt resistor. The third is R16, a 15K, 1 watt resistor. Looking up the pinout of the 5W4 rectifier...

[Image: https://64.media.tumblr.com/85f14d74d8a1...dfb7c0.jpg]

... we see that pins 3 and 7 are NOT USED in this tube, so it is possible that these terminals were used merely to mount this resistor with leads going to another part of the circuit. That said, and given the size of the resistor, and your measurements, I am tempted to say it is probably R13, the 160 Ohm, 1 watt resistor. Trace out any other connections to pins 3 and 7, and see exactly how this resistor is connected. Then you can be sure. Modern resistors are much smaller than their old counterparts. You will be able to buy a 3 watt resistor that will be much smaller than what you have now.