[AI2V]

There's a little brown hexagonal adjustment on the back of the chassis; this is the feedback adjustment and it sounds like that's what you need to tweak.

The 37-84 was my first old radio and cost me $1.25 at a junk store in 1956. I recall adjusting that feedback every day depending on station signal strength. At some point in my inexperience days I washed the dial clean with soap and water and then ruined the photofinish when cleaning it probably with wood alcohol. A couple of years ago I bought a replacement 37-84, one in absolutely showroom condition- and I still adjust the little hex feedback "knob".

Pete AI2V