[Milsurplus] output

[Mike Morrow]

Phil wrote:

>Regarding the output transformers of the command
>receivers, I have a inductance bridge handany and
>made the following measurements:
>
>Xformer 6308 :
>   primary inductance 18.56h
>   secondary inductance 3.868h
>
>Xformer ES-691027
>  primary inductance 10.87h
>  secondary inductance 2.238h
>  sec tap  0.1608
>  primary Q => 10
>
>I think the 6308 is an SCR-274N receiver output xformer
>with the ES-691027 maybe being ARC-5, however
>feedback would be welcome

Phil,

Transformer part number 6308 is the transformer used in the SCR-274-N receivers BC-453-A, BC-454-A, and BC-455-A.  It has a 4000:1800 turns ratio, and the secondary is untapped.

Transformer part number ES-691027 is the transformer used in the SCR-274-N receivers BC-453-B, BC-454-B, BC-455-B, and BC-946-B.  It has a 4000:1800 turns ratio, and the secondary is tapped at 1325 turns.

Transformer part number 5631 is the transformer used in *both* the ARA and the AN/ARC-5 receivers.  It has a 4000:500 turns ratio, and the secondary is untapped.

Your transformers are from SCR-274-N A- and B-suffixed receivers.

Mike / KK5F