[R-390] LS-3 info

Fri, 14 Feb 2003 08:52:11 -0500

Hi Fabio & list

The LS-3 was used with the BC-342 HF receiver according to the mil lists.
The BC-342 was the BC-312 with a rectifier (AC) power supply instead of the
dynamotor.  I imagine the  LS-3  was also used with the BC-312 and BC-314.
It's a black wrinkle speaker, right?

I think the impedance would be 500 or 600 ohms.  There is probably a
matching transformer in the case with a 500-600 ohm primary and 4 to 16 ohm
secondary going to the speaker driver.  It should be easy to open up and
check -- and the transformer might actually be marked with the impedances.
In all these years, someone may have removed or bypassed the transformer,
and possibly replaced the driver also.

As for sound quality, it certainly is not "hi-fi".  What it will sound like
will depend more on the condition of the speaker driver -- cone,
spider/suspension and voice coil -- after 60 years.

Of course, not all LS-3's were made the same to start with.  I am
particularly suspicous of a firm that called itself "Best Manufacturing Co."
This was a subsidiary of LB Industries  (Lowest Bidder) ;-).

It probably fell off a truck some time after the Anzio invasion.  It's OK,
you can keep it. The US Army doesn't use BC-342's any more.  But, now ...
you are going to need one to hook up to that speaker. ;-)

ciao
Barry

----- Original Message -----
From: "Fabio Liberatori" <[email protected]>
To: <[email protected]>
Sent: Friday, February 14, 2003 6:40 AM
Subject: [R-390] LS-3 info

>
>        Hello,
>                 I have found a loudspeaker/box  marked "Signal Corps.
> - US Army LS-3" by Best Manufacturing Co.
>
> Anybody knows about its impedance value  ?
> Is it a good speaker ?
>
>      Thanks in advance,
>         Fabio, I0LBE
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