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History of the manufacturer  

Columbia Radio Co.; Youngstown Ohio

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Name: Columbia Radio Co.; Youngstown Ohio    (USA)  
Brand:
Sentinel
Abbreviation: columb-rad
Products: Model types
Summary:

Columbia Radio Co.; - Trade names:
Columbia
Sentinel ( no connection known to other users of the name Sentinel, neither as a company name, or trade name, or model name).
Only one model known with the name Sentinel.

There was at least 1 ad in QST for Columbia Radio Company offering a Detector/Two-Stage Audio Amplifier for $55.00.
History:
The Name appears in "Radio Collectors Guide1921-19322 and in Grinder/Fathauer:"Radio Collector's Directory and Price Guide" and in Rider's Perpetual vol.1 and vol.3. Columbia Radio Co. is listed in the list of US broadcast stations, licensed as of May 15th 1922 (Source: "WWJ - The Detroit News", 1922) All these stations shared 833 kHz, the only frequency that was approved for broadcast in 1922. The Station was: WMC Youngstown, O.

We found a notice about two ARC-5 transmitters: BC-458A for 5.3 to 7.0 MHz and another one supposed to be manufactured by a "Columbia Radio Co.". We are not sure about any connection to this company. ARC-5 transmitters are command sets used by the US Navy from the latter part of WW2 into the post-war era.

Some models:
Country Year Name 1st Tube Notes
USA  30 SG-10 24  Push-pull af output stage. Also found under "Allied Radio Corp." model SG-10. 
USA  30 SG-5 AC-5-30 [1930] 24A   
USA  30 SG-8 24  Push-pull af output stage There are several versions found in the literature: 1) Man... 
USA  30 SG-9 AC-9-30 [1930] 24  Push-pull af output stage. Also found under "Allied Radio Corp." model SG-9. 
USA  21 Columbia    
USA  27 6 Sentinel   No connection known with other Sentinel manufacturers or models.2 dials. 
USA  30 AC-8-29 SG   Push-pull af output stage There are several versions found in the literature: 1) Man... 
USA  21 Detector/2-Stage Audio Amplifier UV200  Columbia Radio Company Detector and Two-Step Audio Amplifier was first advertised in the N... 
USA  21 Columbia Tuner   Columbia Three Circuit tuner.  
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