[MRCA] [MMRCG] Looking for LS-7 speaker

[Robert Downs]

Let me say first that I do not have either version of the LS-7 available for sale anymore.

 

There are or were actually two versions of the LS-7 made.  The first was the LS-7 which was introduced shortly before WW-II, I think for use with the SCR-284 (BC-654).  It had a stamped steel case and removable stamped steel cover with the 4” speaker mounted to the cover and the  transformer mounted on the speaker.  Transformer primary impedance was a nominal 7000 ohms.  Input was via a 4’ cord  terminated in a PL-55.

 

Second version that came out with the later AN/GRC-9’s was the LS-7-A.  Differences are that it came in the same cast aluminum case as the more common LS-166 had.  The transformer had a a square mounting hole pattern and was mounted to a bracket in the case.  And later ones had the PJ-055B on the end of the cord.

 

Anyway, although it wouldn’t be wrong to use an LS-7 with a GRC-9, the majority would have had the LS-7-A,  So either version could be used and be correct.

 

Robert Downs

 

From: MMRCG at groups.io [mailto:MMRCG at groups.io] On Behalf Of Paul Sokoloff WA3GFZ
Sent: Tuesday, September 14, 2021 07:42
To: mrca; MMRCG at groups.io
Subject: [MMRCG] Looking for LS-7 speaker

 

I am displaying a GRC-9 radio at the Gilbert meet and would like to find an LS-7 speaker to go with it.  If anyone has one they could part with, please email me with details off list at dogfaces at comcast.net 

  

Thanks,  Paul WA3GFZ 

  

  

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