HOME ENTERTAINMENT -  MODEL 13 RADIO (aka THERM-I-ONIC)

Type:  8 tube TRF set with gramophone
Circa: 1928
Tube Lineup :?
Power Input : AC operated
Dimensions: H 50 in x W 35.5 in x D 20.5 in
Original List Price: $ 475
Cabinet: Console or combo. set. The combo console included a gramophone.
Comment: Also known as "Therm-i-onic Combo" .
 

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Model 13 with front doors and lid open.
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Model 13 with front doors closed and lid open. 
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Model 13 cabinet maker's nameplate.
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Model 13 - Closeup of dial
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Model 13 front panel 
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Model 13 gramophone with tone arm in the resting position
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Model 13  - The tone arm is about to play a record.. 
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Model 13 gramophone motor nameplate
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Model 13 - Top view of chassis. One tube is missing in the lower left corner.
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Model 13 speaker assembly. This is the Temple Air Chrome speaker, model 'J .  In Air-Chrome construction, two tightly-stretched skins, chemically treated, form the' diaphragm.  This diaphragm is so arranged that the large front half is tuned to the lower frequencies and the smaller, or back half, to the higher frequencies.  Both halves are balanced at the centre.  At this balanced centre, the driving unit operates, and, as there is no dead weight to overcome because of the balanced feature, it is easy to understand how the slightest impulse on the driving unit is instantly transmitted to the taut diaphragm.  The result is a sensitivity, a frequency response and a handling capacity in undistorted volume that is a revelation in speaker design. The original cost of the speaker was $25. A detailed article on the Air Chrome speaker can be found here.
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Model 13 speaker name plate.
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Model 13 speaker assembly.cutaway. The model 'J'  dimensions are 24 inches x 24 inches ,(Via Worldradiohistory.com) 
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Model 13 read view of major assemblies
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Model 13 nameplate. 
All Model 13 photos in this table by Cameron Willis.
 
 
 
 
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Model 13 radio-gramophone as it appeared in an early photo.. (Courtesy Early Development of Radio)
013_02_radio_schematic_s.jpg Model 13 (THERM-I-ONIC) radio schematic. Click on thumbnail to enlarge . (Provided by Lewis Bodkin)
013_03_pwrsupp_s.jpg Model 13 (THERM-I-ONIC) power supply schematic. Click on thumbnail to enlarge.(Provided by Lewis Bodkin)
 



Credits and References:

1) The Early Development of Radio in Canada 1901 to 1930 by Robert Murray
2) Lewis Bodkin 05bodkin555(at)mail.com>
3) Air Chrome Speaker explanation: https://worldradiohistory.com/hd2/IDX-Service-&-Sales-IDX/Archive-Radio-Retailing-IDX/IDX/20s/Radio-Retailing-1928-05-OCR-Page-0107.pdf
4) Cameron Willis <wendy.cam(at)shaw.ca>
5) Gerry O'Hara
 
 

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May 23/22