[MRCA] Headset needed

[WA5CAB at cs.com]

They aren't (the same).  HS-18 (8,000 ohm) is an HS-23 without headband (for 
use in tanker helmet or skull cap).  Later in the war BC-221's were issued 
with HS-30 and either CD-604/CD-307 or CD-605.  P-18 and P-20 are 24,000 ohm 
headsets with long cords.  HS-20 is single 470 ohm receiver with canvas strap 
(used with TG-5).

All those mentioned but the HS-20 would work OK.  And impedance quoted is at 
around 1 KC.  I don't have the DC resistance recorded.

In a message dated 3/26/2009 9:57:09 AM Central Standard Time, al at ar88.net 
writes: 
> The output is capacitively coupled to the plate of a triode-connected 
> 6SJ7.  Any garden-variety high-impedance headset (approx. 2000 ohms, DC) 
> should work just fine.
> 
> I'm assuming you meant BC-221F.  The manual on BAMA says P-18 or P-20 
> headset.  I don't know that they're equivalent to HS-18 and 20.
> 
> Al
> 
> wctaylor at juno.com wrote:
> >I'm looking for a good headset for my BC22-F freq. meter. It doesn't have
> >to be perfect, just the right one and working. I'm not sure what the
> >difference is but it calls for either a HS-18 or HS-20. Once I get a good
> >working headset I can check it out and see what else is wrong with it. I
> >picked it up at a local hamfest and it had a red "unrepairable" tag dated
> >1954 inside. 
> >
> >Since I used to be an ET in the Navy I know that this could mean anything
> >from really nothing much at all wrong with it to total FUBAR.
> 

Robert & Susan Downs - Houston
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