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I do remember working on a couple of Muntz's with the 5U4 (5V4?) sitting on top of the transformer. Those TVs also didn't have fine tuning. I'll bet Muntz was real happy when they got rid of the damper tube although they went back to the design with a damper. They liked the 5V4 because its filament drew 1 amp less current than the 5U4.
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