Boredom got the best of me: AA5 hum and loop antenna

[Kevin Kuehn]

I think these are the intended connections for the antenna as pictured below. The outside antenna wire and ground form a single turn around the perimeter of the internal spiral loop. Internal loop connects between AVC line and the grid of the 12BE6. The outside antenna ground should be left disconnected or returned to an earth ground, but not the AC chassis ground, unless you don't mind having a shock hazard.