[Ron Ramirez]

Guys, I think I just figured it out.

I was just looking at the schematic of my (circa 1959) Fisher FM-100 tuner (attached, below). It takes its signal for the EM84 Magic Eye, not from the ratio detector circuit as in the Coronet, but from the 4th IF/limiter transformer, which has its own sets of diodes and an electrolytic.

I think I understand it now.

I wish I had a schematic of the FM-50-B tuner, but none are available online. It also uses an EM84 Magic Eye. I pulled a Wide-Band ratio detector transformer from an FM-50-B junker. This explains why it caused no trouble in the FM-100, since as I stated above, the FM-100's EM84 gets its signal from a different point in the circuit; hence, the Wide-Band transformer has no ill effect in the FM-100.

So, Arran and Tim...you may be right about the FM-100-C's Wide -Band transformer being OK. Yes...it does make sense to me now.