[NJARC] speakers

[Al Klase]

Hi Vic,

OHMMETER!

Dynamic speaker has 4 connections.  You should see low ohms between two 
of them. That's the voice coil, and hum-bucking coil shown in the 
schematic connected to the output transformer.  The other two should 
read something like 650 ohms.  That's the field coil, shown on the 
schematic as the power supply filter choke.  Check for shorts between 
the two windings, and from the windings to the speaker frame.

That should do it.

Al

On 6/3/2013 10:50 AM, VICTOR BELLINI wrote:
> Just remember
> Reply = Poster
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>
> _________________________________________________________
> I am restoring a philco 47-1230 and have finished changing all of the 
> caps including the electrolytics. The speaker cone is badly damaged 
> but using speaker glue, I repaired the cone as best as possible to do 
> a test.
>
> there are four speaker wires connected to a four prong plug that 
> connects to the speaker. the wires were broken off so my first job was 
> to try and figure out the correct connection for the wires (green, 
> white, orange and red). Using clips and a meter I managed to get a 
> very low volume station (at full volume) and now nothing after moving 
> one of the clips on the speaker and a few pops then nothing.
>
> So my questions....Is there a way to test a speaker to make sure that 
> it is working and how can I make sure that I have everything connected 
> correctly. The schematic does not help with color code for wires or 
> with any information about the speaker etc.
>
> thanks
>
> ----- Original Message ----- From: "Alex Magoun" <a.b.magoun at ieee.org>
> To: <njarc at mailman.qth.net>
> Sent: Monday, June 03, 2013 8:48 AM
> Subject: [NJARC] Oops--location of Antique Engine Jamboree
>
>
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-- 
Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/