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commanderhix
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Post subject: Mysterious speaker Posted: Feb Fri 17, 2012 1:23 am |
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Joined: Feb Fri 17, 2012 1:14 am Posts: 30 Location: washington
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markjd
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Post subject: Re: Mysterious speaker Posted: Feb Fri 17, 2012 4:43 am |
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Joined: Mar Tue 02, 2010 6:53 pm Posts: 297 Location: Virginia
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If I had to guess, it looks like an intercom speaker with buzzer... 40's vintage with that black crackle paint and cord.
Mark
Last edited by markjd on Feb Fri 17, 2012 4:51 am, edited 1 time in total.
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commanderhix
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Post subject: Re: Mysterious speaker Posted: Feb Fri 17, 2012 4:48 am |
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Joined: Feb Fri 17, 2012 1:14 am Posts: 30 Location: washington
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thanks, as soon as i finish with the stand i'll get some pictures up and see if that helps any to get more specific dating and stuff  thanks!
_________________ ~Kyler
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battradio@
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Post subject: Re: Mysterious speaker Posted: Feb Fri 17, 2012 5:27 am |
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Joined: Jul Fri 18, 2008 10:02 am Posts: 1372 Location: near ST Louis Mo
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It is a balanced armature speaker , it should be highly sensitive and used with very low power output devices such as a low power tube battery radio
_________________ Mark
(Conti the brain damaged robot )
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markjd
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Post subject: Re: Mysterious speaker Posted: Feb Fri 17, 2012 5:47 am |
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Joined: Mar Tue 02, 2010 6:53 pm Posts: 297 Location: Virginia
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So much for guessing... Never seen one before, but it looks interesting. Could be from earlier than the 1940's if that's what it is.
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commanderhix
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Post subject: Re: Mysterious speaker Posted: Feb Fri 17, 2012 6:04 am |
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Joined: Feb Fri 17, 2012 1:14 am Posts: 30 Location: washington
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I was wondering what that type of speaker was called. I really appreciate the information. If you want, check back tomorrow and i should have some pictures up of the stand, as well as a few pictures of the speaker with the grill cloth.
_________________ ~Kyler
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Harold Wright
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Post subject: Re: Mysterious speaker Posted: Feb Wed 22, 2012 2:48 am |
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Joined: Mar Sun 29, 2009 3:34 am Posts: 520 Location: chancellor al.
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[quote="battradio@"]It is a balanced armature speaker , it should be highly sensitive and used with very low power output devices such as a low power tube battery radio[/quote]
I concur with above quote. It is very probably a high impedance speaker; not your typical 4 or 8 ohm type (I would guess about 2000 ohms impedance)
Harold
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radiotechnician
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Post subject: Re: Mysterious speaker Posted: Feb Wed 22, 2012 6:56 am |
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Joined: Sep Thu 23, 2010 6:37 am Posts: 3936 Location: Powell River BC
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Armature speakers are what hearing aids use today. They finally have got the computer power needed to analyze why they work the way they do and tweak them.
_________________ de VE7ASO VE7ZSO Amateur Radio Literacy Club. May we help you read better. Steve Dow ve7aso@rac.ca
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Geoff Fors
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Post subject: Re: Mysterious speaker Posted: Feb Wed 29, 2012 11:56 pm |
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Joined: Jan Thu 01, 1970 1:00 am Posts: 2431 Location: Monterey California USA
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A couple manuals I have refer to them as a "magnetic" speaker. Apparently popular on small battery operated gear as mentioned above.
_________________ WB6NVH
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codefox
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Post subject: Re: Mysterious speaker Posted: Mar Thu 01, 2012 12:18 am |
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Joined: Nov Sat 27, 2010 6:15 pm Posts: 3596
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Yes, they were early portable radio (not so) loudspeakers. You could restore as a curiosity, but frankly the quality is pretty poor. If you have a set that otherwise is OK, you could sub a (PA) 70.7 volt distribution to voice coil, use a 4 or 8 ohm PM speaker, and that's it.
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