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Haven't seen it applied in this position. For a few years at the end of the thirties/early forties, little cells like this were used to provide negative grid bias, usually to the first audio tube. This looks like it works back to the IF grid. I see another one down by the voltage changeover switch. A bit headachey trying to trace what they do!
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Reece
Perfection is hard to reach with a screwdriver.
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