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John:
Tim answered with a list I have never seen before. Thanks Tim.
Pete:
The official reason for the two 5U4s replacing the 5V3 was reliability. The 5V3s seemed to last about four or five months. I never replaced a 5U4 in a modified set. The 5V3 did run extermely hot so it's possible that it melted solder joints. That would take 600 degrees so it may have just crystalized them with the same result.
The kit had loads of other stuff in it. A healthier horizontal output tube, flyback and high voltage rectifier circuit were all intended to improved reliability. For the most part it worked as designed.
Don
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