[Milsurplus] Unknown "DF" Mechanical Filter

[Gordon Smith]

I am glad now that someone has named the results 
of this collecting pastime. Henceforth, it will 
be called the "Miller Threshold" :)


At 07:53 AM 2/16/2020, Al Klase wrote:
>Hue,
>
>The Wikipedia article on R-390A has a list of 
>manufacturers of that radio that includes:
>"Electronic Assistance Corp 15,338 (includes Dittmore Freimuth marked radios)"
>I didn't know about that, but I think it's your answer.
>
>On another note.  A long time ago, you suggested 
>that if there wasn't a hamfest, you could root 
>through your own stuff, and find something 
>unexpected.  I feel a lot of us have passed 
>beyond the Miller Threshold, and can do the same.  ;-)
>
>Best regards,
>Al
>
>On 2/16/2020 12:35 AM, Hubert Miller wrote:
>>Anyone here know about a mechanical filter, 
>>blue color finish, 2 screw mounting with 3 pins 
>>at each end, similar size to small Collins,
>>with "DF" logo in circle, and this number on it:  No internet info found !
>>
>>TYPE D.F-455-U-2.3-H      ( may be DF or D.F. )
>>P/N  7232-528-3
>>
>>After today's hamfest, I decided I should 
>>hamfest at my storage, and I found this and 2 
>>new boxed Collins 455 2.1 filters. Hmmm
..
>>I had no idea I owned these!
>>thanks-
>>Hue Miller
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