{Collins} 75A3 AM FILTER

I'm looking for an AM filter for a 75A3. As an alternative, will a 75A4 be 
compatible electrically?  Mechanically it's not, but if it electrically 
compatible, then that might be an alternate if I can't scare up the right one.


Sponsored by the Collins Collectors Association http://www.collinsradio.org
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