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This is a model 47SE extension speaker with built in amplifier.  It runs a 50C5 on the output into two series wired PM speaker.  This unit was donated to K3MJW Skyview Radio Society by a silent key estate.  It will be auctioned on eBay and the proceeds going to K3MJW.  

This unit need the capacitors replace.  It works but has a significant AC hum. 


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