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Originally Posted by Jarl Ayari
Should the metal rectifier read as a normal diode? I get about 1.2Meg one way and 1.7Meg the other...
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In a nutshell....No! A metal rectifier is a very non-linear device and at low voltages, the forward resistance will be almost as high as reverse. As you increase the forward voltage, the resistance falls. So you can see that if you measure with an Avo ( or almost any other meter) where the terminal voltage is only 1.5 volts or so, the forward resistance will measure very high. Best thing to do would be to replace it with a silicon type and a series resistor. Start with around 200 ohms at 10 watts and then experiment with the value until you have correct HT. You can leave the original in place but disconnected so to maintain appearance.
Rich.