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Audio and Video Talk
The Vintage Audio Section
A sad pair of 1949 Jensen AO 20672 Field Coil transducers.
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<blockquote data-quote="Family_Dog" data-source="post: 902668" data-attributes="member: 82"><p>Michon, you are aware that the speaker is not a permanent magnet type? It requires a DC voltage on the field coil in order to energise the electro-magnet. Typical of old valve amplifiers and the coil operated as a smoothing choke as well.</p><p></p><p>In other words, without the electric field in the field coil, these speakers will not work. Energise the field coil, they will work and would probably sound pretty good as well.</p><p></p><p></p><p>-F_D</p></blockquote><p></p>
[QUOTE="Family_Dog, post: 902668, member: 82"] Michon, you are aware that the speaker is not a permanent magnet type? It requires a DC voltage on the field coil in order to energise the electro-magnet. Typical of old valve amplifiers and the coil operated as a smoothing choke as well. In other words, without the electric field in the field coil, these speakers will not work. Energise the field coil, they will work and would probably sound pretty good as well. -F_D [/QUOTE]
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Audio and Video Talk
The Vintage Audio Section
A sad pair of 1949 Jensen AO 20672 Field Coil transducers.
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