The 1st-generation Scott tube tuner design incorporated the
6BS8/6BQ7A and 6U8A tubes in a modular "Silver-plated" tuner
assembly. All Scott FM tube tuners (with the exception of those types
listed below) used this "Scott-standard" 2-tube, Cascode FM
front-end, which was sometimes referred to as the "Z-FM-3"
The 2nd-generation Scott FM tube tuner design incorporated Compactron
tubes, in 1962 into the
370-series (and LT-111, kit version) "entry-level" FM-MPX Stereo
The final (tube) and 3rd-generation Scott FM tube tuner design incorporated Nuvistor
tubes. The Scott Nuvistor design tuners appeared in 1964-65 and included the
4312, 312(A) and LT-112(A) and the 348(A) receiver. These designs were actually tube/solid-state
hybrids; incorporating solid-state IF and preamp sections. Scott Nuvistor
FM tuners/receivers were soon "up-dated" with FET front-ends in
1965-66, an industry first.