47 Ohm Speakers....
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Location: Melbourne, VIC
Member since 26 December 2010
Member #: 794
Postcount: 387
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Hi everyone,
I have a couple of HMV 'Bahama' portable record players from the 1960's. Both of them have speakers blown and require replacements. Given the current speakers are 47 ohm, what would be the suggestion as for a replacement? I have looked wt getting the current ones rebuilt, but due to the odd value, no one can do them ...
Look forward to your assistance.
Cheers
Scott
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Location: Sydney, NSW
Member since 28 January 2011
Member #: 823
Postcount: 6797
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47 ohms doesn't sound right to me. Are you sure it's not 4.7 ohms?
The only time I have come across 45 ohm speakers is in vintage office intercoms where the speaker doubles as a microphone.
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Location: Hill Top, NSW
Member since 18 September 2015
Member #: 1801
Postcount: 2109
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I've seen a 80 ohm speaker in a TV, so 47 might be correct.
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Location: Sydney, NSW
Member since 28 January 2011
Member #: 823
Postcount: 6797
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Okay, I have found the schematic for model O3-8K and I note that it's a solid state circuit with transformerless output and 47 ohm speakers.
I don't like your chances of finding replacements other than in donor units, if you can find any.
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Location: Penrith, NSW
Member since 7 April 2012
Member #: 1128
Postcount: 393
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Early transistorised amplifiers often had high impedance speakers.
I even have a radio with a centre tapped voice coil.
I can get, and do have numerous 45 ohm speakers, but they are tiny.
36mm diameter, height 5mm power 0.5W
Wayne.
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Location: Wangaratta, VIC
Member since 21 February 2009
Member #: 438
Postcount: 5461
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The speakers were often in the collector of the OP transistor. The only other possible option is likely a transformer.
Marc
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Location: Melbourne, VIC
Member since 26 December 2010
Member #: 794
Postcount: 387
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Hi guys,
Thanks for the replies thus far. I have just emailed a couple of pics for loading on this topic that may assist. The size of the speakers are 10cm x 17.5cm
Any suggestions on a way to replace them is appreciated - the amp unit is an early simple sold state amp
Cheers
Scott
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Location: Sydney, NSW
Member since 28 January 2011
Member #: 823
Postcount: 6797
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Location: Melbourne, VIC
Member since 26 December 2010
Member #: 794
Postcount: 387
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Thats guys, The power handling is very low - I think it's only about 5Watts per channel.
cheers
Scott
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Administrator
Location: Naremburn, NSW
Member since 15 November 2005
Member #: 1
Postcount: 7444
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Photos uploaded.
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A valve a day keeps the transistor away...
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