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It seems as if a 100 ohm adjustable resistor would be kind of high in value. I agree that an adjustable resistor is the way to go, that way I can get the exact B+ voltage by setting the resistor so that I get the required 400 volt by adjusting it. I am thinking more in the 10-25 ohm range with adjusting it to the close end would be 0 ohms and maybe like 10-25 ohms at the far end. If Zenith 6S621 achieved the proper voltage using just 4 ohms, a 100 ohms resistor would be adjusted all the way to the end. I found out that I can re-stuff at least the main filter cans, so I'm going to give it a try.
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