ZENITH MODEL 10-S-147 Specifications from the 1937 dealer catalog:

CIRCUIT:  10-tube superheterodyne.  Triple Filtering.

TUBES:   Metaglas;  1-6K7  R.F. amplifier;  1-6A8 converter;  1-6K7  I.F. amplifier;  1-6H6  Diode detector;  1-6C5 audio amplifier  1-6C5  driver;  2-6L6 power output;  1-6C5 tuning indicator amplifier;  1-5Y3 rectifier.

CABINET:    This is a cabinet comfort lovers will welcome.  It snuggles comfortably alongside any armchair, divan, day bed, etc.--the dial being recessed offers the utmost convenience in operation.  A polished plate glass panel protects dial and slides neatly out of sight when set is in use.  Hinged top covers utility compartment.  Cabinet finished in rich Oriental walnut and specially selected American hardwood.    

DIMENSIONS:  22 3/4 inches high; 17 5/8 inches deep; 28 inches wide.  

SPEAKER:  12-inch electro-dynamic..

CONTROLS:  Tuning, switch and calibrated volume;  Voice, Music, Hi-Fidelity, Sensitivity;  Band Switch.

CONDENSER:  3-gang, rubber floated.

WAVE BANDS:  Tuning range of 3 bands covering 538-1,780 K.C.;  1,740-6,040 K.C.;  5,500-19,250 K.C.;  (557-168.2;  172.4-49.6;  54.5-15.5 meters.)

OTHER FEATURES:  Split-Second Station Re-locator.  Lightning Station Finder.  Built-in antenna tuning for doublet connection.  Set may be used with hard-of-hearing aid and is adaptable to Secret Volume Governor.  Target Tuning.  Wattage output-12 watts