[Milsurplus] Origin of LS-11 loudspeaker

[WA5CAB at cs.com]

Hi,

An original LS-11 does have a matching transformer.  Its impedance is 250 
ohms to voice coil.  The postwar LS-11-A (cast aluminum case) uses the same 
transformer as the LS-166 and LS-454 and is 600 ohms to voice coil.

The LS-11 is an alternate to the LS-7 for the BC-654, BC-1306 and (LS-11-A) 
RT-77/GRC-9.  The latter two have an impedance setting switch labeled 4000 
and 250.  I'm not sure what the rational was with the BC-654.  The only 
application I recall coming across where only the LS-11 (later only the LS-11-A) 
is called out is with the AN/TXC-1 FAX set.

In a message dated 11/22/2010 3:29:13 AM Central Standard Time, 
yonglee at yonsei.ac.kr writes: 
> Anybody knows what  the matchig radio is for LS-11 loudspeaker ?
> LS-11 looks the same as LS-7(for GRC-9) but it does not have 
> a matching transformer inside.
> 

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480