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Those filaments look very bright... I hope that you are not exceeding the 5 volt specification by turning the rehostats up too far with the new battery, which will severely shorten tube life. Can you measure the filament voltage?
jr
The non-A tubes' filaments were non-thoriated and ran that bright by design. The 'A' tubes' thoriated filaments could run much cooler at 1/4 the amperage
11-25-2016, 06:38 PM
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