[Ron Ramirez]

...an offer on a rail car full of 6G-E12s, so they used them on their lower end tuners rather then a pair of EM84s.

Forgot to mention...Fisher's first "stereo" tuner (AM/FM simulcast, no FM multiplex) was the 101-R which used dual EM84 magic eyes. The 100-R replaced the 101-R around 1960. In 1960 Fisher only had the 100-R, FM-100 (FM only, EM84 indicator), and FM-50 (also FM only, EM84 indicator). Plus the 100-T and 202-T which were tuners with stereo preamps.

The FM-50 was the low end model; the 100-R was their best tuner (only).

In 1961 along came the 202-R to replace the 202-T; the 202-R had no preamp. The 100-T was discontinued.

And then in late 1961 the new 1962 models came out with the new GE-Zenith FM multiplex system. All of the old tuners were replaced; the FM-50-B replaced the FM-50; the FM-100-B replaced the FM-100; and the R-200 replaced the 202-R. There was also now an FM only version of the R-200, the FM-200-B.

Through all this, the 100-R is the only Fisher tuner to have used the 6G-E12 tube.