Silver-Marshall 728 "Q"
Silver-Marshall Incorporated,
6401 W. 65th Street,
Chicago, Illinois, USA

A photo of the cabinet will be
posted as soon as warmer
weather allows for photographing
the set outside.

    This radio was one of the largest Silver-Marshall offered for 1932.  It comprises of a model 728 receiver fitted with a Jensen model D-1 speaker (Midrange/Tweeter) and dual Jensen model D-9 bass speakers (Woofers).  The field coils of the dual woofer speakers are powered by a separate power supply that also serves as a L/C crossover for all three speakers.  I acquired this radio, in September 2000, from an auction in Cicero, Indiana.

Tube Line Up:
58...1st. Detector / Mixer
56...AM Oscillator
56...SW Oscillator
56... SW Frequency Driver
58...1st. I.F. Amplifier
58...2nd. I.F. Amplifier
56... 2nd. Detector
45...Audio Driver
45 x 2...Push - Pull Audio Output
Speaker Power Supply/Crossover

Height...47 inches
Width...26 inches

Frequency Range:
BC Band (White)...550 kHz to 1500 kHz
P Band (Yellow)...1.6 MHz to 4.6 MHz
SW1 Band (Green)...3.6 MHz to 9.3 MHz
SW2 Band (Red)...9.5 MHz to 25 MHz
I.F. Frequency...175 kHz

Power Source:
AC...110 Volts

    The schematic and information of this radio can be found at the Nostalgia Air web site by clicking on the link below.

Schematic & Information

Schematic (Triple Speaker)

    This is an artists drawing of the manufacturing plant as it looked when it was constructed in 1928-1929.  Silver-Marshall Inc. occupied this building from 1929 until it went bankrupt in 1933.  This illustration is featured on the company's "General Parts Catalog" for April of 1929.  An aerial view of  this building can be seen using Google Earth when the following address is used:  6429 65th St, Chicago, IL 60638-5101

This web page was last updated: February 3, 2006