[Boatanchors] Vintage Headset Impedance

Fri, 30 Apr 2004 19:00:50 +0100

Can anyone tell me what the purpose of the bakelite unit coded C-410 often
seen connected in-line on the P-18 headphones. Is it a transformer and what
are its impedances?

Pete
G4GJL

----- Original Message -----
From: <[email protected]>
To: <[email protected]>; <[email protected]>
Sent: Thursday, April 29, 2004 6:10 PM
Subject: Re: [Boatanchors] Vintage Headset Impedance

> Bill,
>
> P-18 24,000
> P-20 24,000
>
> Main difference between the two is the headband.  Both use two of the
R-2-A
> permanent magnet type receivers.
>
> BTW, HS-23 (8,000 ohms) also works well.  Mid-war on, sets were issued
with
> Headset HS-30.  Cord Hi-Z or Lo-Z) issued with HS-30 depended on BC-221
model.
> Later models differed in that they were set up for 600 ohm headsets, not
the
> Hi-Z ones.  HS-33 works well with them.  HS-30 is an ear-plug type headset
and
> not (to me anyway) as comfortable to wear as the earphone types with
rubber
> or chamois ear cups.
>
> In a message dated 4/29/2004 12:01:39 PM Central Daylight Time,
> [email protected] writes:
> Can anyone tell me what the impedance of a P-18 or P-20 military headset
that
> is used with a BC-221 frequency meter might be? Also was wondering if the
> P-18 or P-20 was a crystal headphone?  Thanks, Bill, ab0zz
>
> 73
> Robert Downs - Houston
> <http://www.wa5cab.com> (Web Store)
> <[email protected]> (Primary email)
> <[email protected]> (Backup email)
>
>
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