[ARC5] My mil phones - solved.

[Kenneth G. Gordon]

On 2 Jan 2015 at 17:12, Mike Hanz wrote:

> On 1/2/2015 2:21 PM, Kenneth G. Gordon wrote:
> > OK. So they are HS-23s with a 4K impedance.
> 
> Then you're in luck.  The ones in the ebay offering appear to be 
> NAF-48490-1, which do fit USAAF HS-23 or HS-33 headsets with ANB-H1 or 
> H1A elements.  The notches allow headbands that engage either pair out 
> of the four pivot points on the element.  They also work fine for Navy 
> aircraft headphones (duh...NAF = Naval Air Facility)

Great. I just bought three sets. I believe I have at least one more set of these 
HS-23/33s around here, also without pads.

> > According to what I have found so far, I don't understand why they have a
> > PL-354 on them though...
> 
> Nor do I.  The red PL-354 was used to identify a low impedance HS-33 
> headset during the period when both HS-23 and HS-33 headsets were in use.

That's what I gathered from your webpage on this. Hmmm....well, mysteries 
never cease with this stuff. A lot of the white paint is missing from the PL-354 
lettering, but it can still be read. After going to your website, I checked to 
make sure it read PL-354 and it does.

I'll be mighty glad to get the pads, though.

I'm going to go through my stash of "junque" to see if I have any other decent 
headphones.

I also have at least six of those extensions which fit the PL-54/354 on one 
end and terminate in a standard phone plug on the other.

I do have a set of military phones which are wired with a cable terminating in 
a BNC connector. Supposedly, they are 20K ohm @ X-frequency phones. 
They have integral soft rubber pads, and the shells are made of aluminum. I 
have not been impressed with these, however... They sound weak with 
everything I've tried them with, and that BNC connector is a PITA.

As I remember it, someone here told me these were originally for some sort 
of mine-detector.

Ken W7EKB