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hum in a Kit 1?

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2 things: Are you using an indirectly-heated rectifier (ie GZ37/CV378)?
If not, have you checked your power supply caps?
Sometimes the initial voltage surge (with a directly-heated rectifier like a 5U4)is greater than the limit of the caps. They don't fail outright, but a residual 60hz hum results. (my reference on this point currently escapes me)
Regardless of the cause, don't automatically assume that more efficient speakers will accentuate this hum. Sometimes the audibility has more to do with the tonal characteristics of the speaker.
Mark



Edits: 09/03/20

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