Scott quickly followed its successful 1954 introduction of the FM-only 310-A
Broadcast Monitor, with the AM/FM 330-A in 1955.
The 330, 331 , and
333-series, featured twin independent tuner sections, designed to facilitate
"Stereo-Simulcast" reception. In 1959, the first Scott stereo
receiver (with integrated power amps), the Type 399, also featured Scott's famous twin round tuning
dials (the 399 FM section was still mono, as "true stereo"
(multiplexing) was still 2 years away (1961).
The basic Scott AM design utilized the following tubes:
6BA6 AM RF
6BE6 AM Converter
6AU6 AM IF Section
6AL5 Combined AM
Detector and AGC (the 330-D used a 6CN7)
Later Scott introduced, less-costly (and more traditional)
AM/FM tuners and receivers that shared a common tuner front-end (which were not
"Stereo- Simulcast" capable). These included types: 300, 320, 345,
355, and 380. These types take advantage of "shared" tube circuitry
between AM and FM duties, but still utilize the traditional Scott AM three-tube
lineup: 6BA6, 6BE6, 6AU6.