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I have a 58 Zenith Space Command that uses a 5AU4 instead of the pretty much standard at the time 5U4. I may be wrong, but it seems like the specs were almost identical and I can sub the 5U4 in with no problems. This particular chassis design was used for a number of years and through the run they used both tubes. A power supply/rectifier is a pretty basic and straight forward circuit that you wouldn't think would require much design change.
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