[ARC5] [Milsurplus] ARC-5 or SCR-274-N ID Question

[J. Forster]

Hi Robert,

Thanks very much.
-John

============


> John,
>
> I left off the column headers (added below).
>
> Unfortunatately (in this case), the audio transformer, RF choke and Audio
> choke each carry the same A.R.C. part numbers.  At least according to the
> manuals.
>
> The easiest ID'er (of those requiring removal of covers) is pin 8 on the
> 2nd IF tube socket.  If it's grounded, the receiver is from AN/ARC-5.  If
> it
> isn't, then not.  But the 12SF7 has filament on 7 and 8, like the 12SR7.
> So
> don't just look for a socket with pin 8 grounded.
>
> In a message dated 10/25/2009 10:32:35 AM Central Standard Time,
> jfor at quik.com writes:
>> Wonderful, Robert.
>>
>> Do you have any data on te bigger coil unit on the underside of the
>> chassis? Those numbers are easier to see.
>>
>> Much appreciated.
>>
>> -John
>>
>> ==================
>>
>>
>> >To answer an earlier question, the RF coil racks have the same A.R.C.
>> >number (6220) in both the 46104 and the R-25.  As do the BFO
>> transformers
>> >(5854).
>> >  But the IF transformers are different.
>> >          46104   R-25
>> >1st IF   7271   9681
>> >2nd IF   7272   9684
>> >3rd IF   7273   ?   (missing from manual)
>> >
>> >Pin 8 on the 2nd IF Amp socket is grounded in the R-25 and not in the
>> >46104.  And pin 4 on the front panel plug is unused in the R-25 and has
>> a
>> >wire on
>> >it (TEL.) in the 46104.
>> >
>>
>
> Robert & Susan Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
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