[Collins] What Is It?

[Garey Barrell]

Jerry -

I meant to include the can size......   1.375 x 2 x 3.5.

The BFO can certainly seems likely, although I would have expected a 
fixed BFO as late as 1970.  It's arranged so the variable cap shaft 
could mate with a coupler for a front panel adjustment.

I just hate to tear it up if it was of use for it's original intent.

Thanks!

73, Garey - K4OAH
Glen Allen, VA



Dr. Gerald N. Johnson wrote:
> On Thu, 2007-05-31 at 17:11 -0400, Garey Barrell wrote:
>   
>> I have what I believe to be a Collins part that I have had for literally
>> years.  This is the third state I've moved it to, over 30 years.!  It's
>> brand new and unused.
>>
>> It's a deep drawn aluminum can, with a small variable cap, two section
>> pi-wound, slug-tuned coil, three caps and a resistor.  I'm guessing it's
>> a BFO can, but ...
>>
>> It has three Collins style part numbers.
>>
>> 278 0541 00   This number has a line drawn through it.
>>     
>
> This would be a component specification for an RF or IF transformer
> which could include a BFO coil. The two digit suffix indicates a date
> sometime before the early 1960s from a time period when that last digit
> only showed the paper size of the specification or drawing. So it was
> neglected in parts lists and part identification.
>   
>> X 328 2 CCC
>>
>> 525 2122 002  The first two digits are unclear and may be incorrect.
>>     
>
> The 52x family were assembly drawings, the 002 may have indicated B size
> paper, or been an extension to the basic part number which may have
> applied to multiple parts with common and differing characteristics,
> like an RF coil for a receiver that was band switched with a common
> circuit, a common case, a common application but different coils and
> capacitors. Or in the case of a component specification, a type of
> resistor with the dash numbers for the different available values.
>
>   
>> 7-70  Date code.
>>
>> So.  I'd like to know what it is, and if it's worth keeping.  I suspect
>> it's one of those things no-one needs until they need it, but then they
>> need it BAD!
>>
>>     
>
> What size is the can? That might give a better hint of vintage than the
> part numbers. A 1.5 x 2.5 can might be a 51J or 75Ax part. Or it might
> have been made for a special project that is long forgotten and its only
> value today is for the parts it contains. A grid dip meter or a Q meter
> or a network analyzer could determine the resonant frequency of the
> assembly and that would be a further hint. Though a two section pi wound
> coil sounds a lot like a 455 or 500 KHz or lower frequency part.
>
>