Stromberg Carlson 240H
1938
Stromberg Carlson Telephone Mfg. Co.,
100 Carlson Road,
Rochester, New York, USA

    This 240H was Stromberg Carlson's top table model radio. The cabinet features contrasting veneers and an elaborate curved bakelite grill in an Art Nouveau styling. I acquired this set from Ebay in February 2014.

Tube Line Up:
6K7M.....R.F. Amplifier
6A8M.....1st. Detector
6C5M.....Oscillator
6K7M......I.F. Amplifier
6H6M.....2nd. Detector
6F5M.....Preamplifier
6C5M.....Audio Phase Shifter
6F6M X 2.....Push Pull Audio Output
6G5G.....Tuning Eye Indicator
5U4G.....Full Wave Rectifier

Dimensions:
Height...13.5 inches
Width...25 inches
Depth...10.5 inches

Power Source: AC 120 Volts

Frequency Range:
BC...550 kHz to 1700 kHz
SW1...17 MHz to 5.6 MHz
SW2...5.6 MHz to 18 MHz
I.F.Freq....465 kHz

Schematic and information

    The grillwork, on the side, is made of hollow bakalite and is mounted in place by 4 black nails. The speaker, inside, is mounted facing out at a 45 degree angle.

    The dial is of an orange celluloid material that, when the radio is turned on, a bright beam of light acts as the tuning pointer much like that of the early 1930s Philco radios. The dial scales are printed on by a strong think, non water soluble, paint which makes cleaning the dial relatively safe.
    The original fabric belt was replaced by a JFD #49 belt (15 11/32 inches) instead of the recommended JFD #48 (15 1/32 inches) which was to tight of a fit. It's not unusual that the supposed correct belt replacement turns out to be to short and going to the next size up is the belt that works.

    The chassis is painted with a crystalline paint finish for rust protection. The support handles were designed so that the chassis could be turned upside-down for ease of servicing. All of the components and hardware are of a higher quality then what's commonly seen in most radio chassis. This construction quality of this chassis is much greater then that expected from most of Stromberg Carlson's competition and it's still impressive even today.

This web page was last updated: April 19, 2014