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Audio and Video Talk
The Vintage Audio Section
Lafayette Superheterodyne Radio - 1935
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<blockquote data-quote="El Sid" data-source="post: 1005958" data-attributes="member: 18550"><p>Did a bit of scratching around on the internet today, and found that the arrangement with the choke and field coil was very common in radios of that era, although more usually on the B+ side. I think that's pretty clever using it for a -ve bias voltage. There are even diagrams with that plug, and the pinouts are standard.</p><p></p><p>One detail which escaped me that I read about today is that the speaker connection also winds around the field stator to act as a bit of a humbucker (which you can see in the circuit diagram). This was only 15-20 years into the discipline of electronics - clever chaps.</p></blockquote><p></p>
[QUOTE="El Sid, post: 1005958, member: 18550"] Did a bit of scratching around on the internet today, and found that the arrangement with the choke and field coil was very common in radios of that era, although more usually on the B+ side. I think that's pretty clever using it for a -ve bias voltage. There are even diagrams with that plug, and the pinouts are standard. One detail which escaped me that I read about today is that the speaker connection also winds around the field stator to act as a bit of a humbucker (which you can see in the circuit diagram). This was only 15-20 years into the discipline of electronics - clever chaps. [/QUOTE]
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Audio and Video Talk
The Vintage Audio Section
Lafayette Superheterodyne Radio - 1935
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