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| Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
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28th Aug 2017, 7:17 pm
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#1 |
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Hexode
Join Date: Mar 2008
Location: Wakefield, West Yorkshire, UK.
Posts: 444
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Radios with "energised" speakers
Hi. Are radios with "energised" loud speakers inherently "hummy"? Just wondering. Thanks Rich.
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28th Aug 2017, 7:29 pm
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#2 |
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Moderator
Join Date: Jun 2003
Location: Oxford, UK
Posts: 27,969
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Re: Radios with "energised" speakers
No.
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28th Aug 2017, 7:33 pm
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#3 |
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Dekatron
Join Date: Oct 2003
Location: Croydon, Surrey, UK.
Posts: 7,579
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Re: Radios with "energised" speakers
Absolutely not! The one I have (Ferguson 461) has a 'humdinger' coil fitted in series with the speaker as well. This coil is connected in antiphase to the main speaker energising coil and is designed to cancel out any residual hum. Make sure that the smoothing caps are in good condition.
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There are lots of brilliant keyboard players and then there is Rick Wakeman..... |
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29th Aug 2017, 10:21 am
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#4 |
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Heptode
Join Date: Apr 2016
Location: Croxley Green, Hertfordshire, UK.
Posts: 979
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Re: Radios with "energised" speakers
I have quite few 1930's Murphy radios with energised loud speakers and they are completely hum free.
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Clive |
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29th Aug 2017, 6:08 pm
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#5 |
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Hexode
Join Date: Mar 2008
Location: Wakefield, West Yorkshire, UK.
Posts: 444
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Re: Radios with "energised" speakers
Hi. Thanks for the answers. Much appreciated.
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