RIGOL Technologies (test equipment) - RF Cafe

Webmaster:

BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website:

AirplanesAndRockets.com

Amplifier Solutions Corporation (ASC) - RF Cafe

Montgomery Ward "Airline" Series 7GM 7-Tube High-Fidelity Receiver
Radio Service Data Sheet
January 1936 Radio-Craft

January 1936 Radio-Craft

[Table of Contents]

Wax nostalgic about and learn from the history of early electronics. See articles from Radio-Craft, published 1929 - 1953. All copyrights are hereby acknowledged.

The Montgomery Ward "Airline" Series 7GM is a 7-tube high fidelity superheterodyne table model radio made in the mid 1930s. A Radio Service Data Sheet for it appeared in the January 1936 issue of Radio-Craft magazine. FM broadcasting was not in common use yet, so only AM bands and some shortwave bands were available. In fact, 1936 was the year that frequency modulation (FM) inventor Edwin H. Armstrong first demonstrated his newfangled concept that largely solved the noise problem.

Montgomery Ward "Airline" Series 7GM 7-Tube High-Fidelity Receiver

Adjustments of trimmers on this set follow standard practice, the use of a calibrated service oscillator being a necessity. All alignment must be done with the selectivity control in the sharp position. The power consumption from the light line is 68 W. at 115 V. Average sensitivity over the 3 bands is 1.0 microvolt absolute.

Knockouts are provided on the back of the chassis for addition of parts for a phonograph reproduction circuit. Power transformers are available for use on any A.C. power line. The trimmer layout diagram shows changes which have been made in the location of certain trimmers since these sets were first put into production. New locations are also shown.

Posted December 5, 2016

Radio Service Data Sheets

These schematics, tuning instructions, and other data are reproduced from my collection of vintage radio and electronics magazines. As back in the era, similar schematic and service info was available for purchase from sources such as SAMS Photofacts, but these printings were a no-cost bonus for readers. There are 227 Radio Service Data Sheets as of December 28, 2020.

TotalTemp Technologies (Thermal Platforms) - RF Cafe

Montgomery Ward "Airline" Series 7GM 7-Tube High-Fidelity ReceiverRadio Service Data SheetJanuary 1936 Radio-Craft

Montgomery Ward "Airline" Series 7GM 7-Tube High-Fidelity Receiver

Montgomery Ward "Airline" Series 7GM 7-Tube High-Fidelity Receiver
Radio Service Data Sheet
January 1936 Radio-Craft