[Collins] Suggestion of best 75A receiver for AM reception

[Glen Zook via Collins]

Fair Radio used to sell the R-390 filters separate from the units.  Unfortunately, they no longer sell these.  That is where I acquired the 8 kHz mechanical filter that I use with my 75A-4.  A 9-pin plug, some hookup wire, and a piece of shrink tubing is all that it takes to adapt the filter to the 75A-4. Glen, K9STH

Website: http://k9sth.net
      From: David Knepper <collinsradio at comcast.net>
 To: Joel Hallas <jrhallas at optonline.net>; Collins Radio Association <collins at mailman.qth.net> 
 Sent: Monday, July 20, 2015 5:22 PM
 Subject: Re: [Collins] Suggestion of best 75A receiver for AM reception
   
Did you know that the mechanical filters for the R-390 receiver are 
compatible with the 75A-4 receiver's filters, since both receivers use the 
455 Khz I.F. system.

Some mechanical adaptation will be necessary to mount these filters.