[ARC5] Info sought about output transformer in BC-221-AK

[WA5CAB at cs.com]

The rated impedance of a single R-30 Receiver is 128 ohms at 1 KC.  The two 
used on the HS-30 are connected in series, so 256 ohms.  However, a 
complete HS-30 by itself is not usable as the short CD-620-(*) wye-cord is 
terminated in two spade terminals.  You must add one of four cords (Lo and Hi-Z 
terminated in PL-54 and Lo and Hi-Z terminated in PL-55) in order to get to a 
PL-54 or PL-55.  The later BC-221 models all call for Cord CD-605, which on 
one end has a 256:8000 ohm transformer C-410 and on the other a PL-55.  Cord 
lengths vary from about 36" to around 96", with 60" probably being the most 
common.

In a message dated 01/05/2018 09:58:31 AM Central Standard Time, 
1oldlens1 at ix.netcom.com writes: 
>      I think I have these phones with my BC221 AK and will measure them. 
> I suspect the impedance given is for a single phone, usually they are in 
> pairs connected in series. My phones were made by Murdoch but I am sure 
> other companies built similar ones under contract.
>      My BC-221 still works like a charm.
> 
> On 1/5/2018 6:29 AM, J Mcvey via ARC5 wrote:
> >Just happened upon a passage in the manual that says 'later models used 
> >the HS-30 headset". I looked up the HS-30 and it's 256 ohms.
> >Like I said, they were in transition mode mode...
> >

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480
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