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 Post subject: Stromberg 925 owners instructions
PostPosted: Sep Fri 17, 2021 8:41 pm 
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Joined: Apr Mon 24, 2006 1:05 am
Posts: 1892
Location: Ellington CT
Hi All, I'm doing battle with a Stromberg 925H that had many previous "repairs". Nowhere in the factory notes is there a reference to the "sensitivity" switch, and its purpose. The notes say "see owners instructions", so I'm hoping someone might have a copy of the manual explaining the use. From the schematic, it looks like it may be used to decrease the gain of the RF amp when switched to Broadcast so the radio won't overload, while maximum gain can be provided when switched to FM or Short Wave. The sensitivity switch is located below the 1st limiter stage, and above the "phono filter" diagram on the lower part of the print.
Thanks for any help !


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 Post subject: Re: Stromberg 925 owners instructions
PostPosted: Sep Sun 19, 2021 2:54 pm 
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Joined: Jan Mon 16, 2012 4:15 pm
Posts: 8143
Location: Near Brandon, Iowa
IMO for a "modern" superhet radio like the Stromberg 925, which has an effective AVC circuit, a "sensitivity" control is just window-dressing. These were common on expensive radios up to around 1939. It was probably included to give owners of this set the feeling that they owned a "high end" radio with an impressive number of front-panel knobs. Most users would have set this control to the most sensitive position and then never touched it again (until a friend's four-year-old boy paid a visit, twiddled all the knobs, and left the clueless owners mystified as to why favorite distant station KXXX suddenly couldn't be tuned in anymore).


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