Zenith 12A58
1936
Zenith Radio Corporation,
3620 Iron Street,
Chicago, Illinois, USA

    The Zenith 12A58 is sometimes referred to as the baby stratosphere because much of the design in the cabinetry and dial are similar what is found on the Stratosphere.  Also the 12A58, (with it's sister radio the 12A57), the 16A61, 16A63, and the Stratosphere were the only models Zenith manufactured which incorporated lighted glass dials.  The first dial that the 12A58 featured was a multi layered colored dial which consisted of the top layer showing the Zenith logo along with the micro tuning in White, followed by four layers, each representing a different band. The A and B bands were in Green and the C and D bands were in Red.  Only one band was ever lit up at any given time while the other bands stayed dark.  A short time later a second version of this dial came out with all of the bands being printed onto a single layer of glass.  The A band was in solid light Blue, the B band was in solid Green, the C band was in solid Yellow and the D band was in a solid dark Red.  The Zenith logo along with the micro tuning was still in White.  A third version dial later came out which was exactly like the second version dial except that all of the numbers, and text were in white and only the thin strips that marked the frequencies in increments were in their respective band colors.
    Performance is average because Zenith invested more money in the appearance of the radio then they did the electronics.  They cut corners on the front end of it's electronics which made this radio less of a performer, reception wise, then Zenith's 10 tube model, the 900 series, of 1935.  I acquired this set in 1991, in a trade with an E. H. Scott AW 15 in a Wistminster cabinet, from a prominent collector from Minnesota.

Tube Line Up:
6K7G...R.F. Amplifier
6A8G...1st. Detector / Heterodyne Oscillator
6K7G...I.F. Amplifier
6H6G...2nd. Detector / AVC
6C5G...Shadowgraph Driver
6C5G...1st. Audio Driver
2 X 6C5G...Push - Pull 2nd....Audio
2 x 6F6G...Push - Pull Audio Output
2 X5Y3...Push - Pull Rectifier

Frequency Ranges:
LW Band (Blue)...150kHz - 370 kHz
BC Band (Green)...550 kHz - 1740 kHz
PB Band (Yellow)...2 MHz - 7 MHz
SW Band (Red)...7 MHz - 22.5 MHz
I.F...456 kHz

Measurements:
Height...39.5 inches
Width...25.5 inches
Depth...15 inches

Power Source:
AC...110 Volts

Schematic & Information

3 pane 1st. version glass dial

1 pane 2nd. version glass dial

1 pane 3rd. version glass dial

This web page was last updated: June 29, 2019