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Kirt Blattenberger - RF Cafe WebmasterCopyright
1996 - 2016
Webmaster:
Kirt Blattenberger,
 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 Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

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Canadian Westinghouse Model 175, 7-Tube Dual-Range Superhet
Radio Service Data Sheet
May 1936 Radio-Craft

May 1936 Radio-Craft

May 1936 Radio-Craft Cover - RF Cafe[Table of Contents]

People old and young enjoy waxing nostalgic about and learning some of the history of early electronics. Radio-Craft was published from 1929 through 1953. All copyrights are hereby acknowledged. See all articles from Radio-Craft.

This is another Radio Service Data Sheet that appeared in the May 1936 edition of Radio-Craft magazine. I post this schematic and functional description of the Canadian Westinghouse Model 175 7-Tube Dual-Range Superhet manufacturers' publications for the benefit of hobbyists and archivists who might be searching for such information either in a effort to restore a radio to working condition, or to collect archival information. 

Canadian Westinghouse Model 175, 7-Tube Dual-Range Superhet

(6 metal tubes; Air Pilot; tone-flow cabinet; ranges 530-1720,5,500-18,000 kc.; tone compensation; manual tone control.)

This set is similar to the Canadian Westinghouse Model 275, except that only 2 bands are provided on the Model 175.

All the voltages are given on the trimmer layout drawing. The D.C. readings are taken with respect to chassis. The R.F. line-up frequencies are 1,500 and 600 kc. for band A; 17,000 kc. on band C. Range B on the model 275 is aligned at 5,160 kc. The receiver is designed to allow the Service Man to make use of a tuning wand, and this tool should be used before any alignment is attempted. The I.F. stage is aligned at 460 kc. Before actual R.F. adjustments are started, the dial pointer must be set at the correct position. This is done by turning the tuning condenser to maximum, and setting one end of the pointer exactly to the horizontal line at the low-frequency end of band A, while the other end should be within 1/64-in. of the line at the high-frequency end.

The power consumption of these sets is 72 W., while there is 2 W. undistorted, and 4 1/2 W. maximum output.

Automatic tone compensation is provided on the manual volume control, by means of a resistance-capacity network, which increases the low-frequency response at low-volume levels,

The Air-Pilot is a combination of features which are said to enable accurate tuning of the receiver by even the most inexperienced owner. A world time map is provided in an illuminated drawer. This is fitted in both console and table models.

The console receiver uses a 12 in. speaker, while an 8 in. unit is used in the table model.

The variable condenser is mounted on a special shock-proof support, which prevents microphonic howl due to acoustic feedback from the loudspeaker.

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 156 Radio Service Data Sheets as of December 6, 2016.

 

 

Posted May 18, 2015