[ARC5] Earphone pads...

[D C _Mac_ Macdonald]

Are these pads suitable for the HS-23 and HS-33 headphones? 
 
* * * * * * * * * * * 
* 73 - Mac, K2GKK/5 * 
* (Since 30 Nov 53) * 
* k2gkk hotmail com * 
* Oklahoma City, OK * 
* USAF & FAA (Ret.) * 
* * * * * * * * * * * 
 

 
> From: 1oldlens1 at ix.netcom.com
> To: jeepp at comcast.net; arc5 at mailman.qth.net
> Date: Fri, 2 Jan 2015 09:15:08 -0800
> Subject: Re: [ARC5] Earphone pads...
> 
>     There are pads that were originally sown into nylon 
> flying helmets. There were often cut out of the helmets and 
> some of the pads may also have been surplussed out before 
> being used.  These will work fine but the phones are 
> slightly tilted. The pads are marked "Front" on one side to 
> indicate this.  The standard ear-muff pads were designed to 
> go on any of about three styles of headband so have 
> clearances for the larger forks on some of them. There is 
> also a clearance for plug type connectors occasionally 
> found.  When mounted for the type of band that has the large 
> forks the pad should be mounted with the cut out for the 
> leads facing _down_ since its not needed for the lug type 
> connectors and gives better clearance for the forks that 
> way.
>     There were also at least two styles of smaller pads used 
> before the earmuff style. I think there were not 
> satisfactory in noisy aircraft. One was a rather small pad 
> that is found on the R-14 type phone and the other is a 
> larger conical pad. I have not seen any of the latter for a 
> very long time.  The earmuff type was originally made using 
> a rubber body and chamois covers filled with kapok. There 
> were later versions made at least up to the Korean war that 
> had two piece plastic bodies and plastic covering material. 
> All will fit the ANBH-1 and 1A phones.
>      It would be interesting to know something of the 
> history of the development of these headphones. The first 
> ones were conventional bipolar magnetic phones with rather 
> poor voice reproduction. These were replaced with the ANBH 
> type which I think are either moving coil and then by the 
> ANBH-1A which is a moving coil phone of very good quality. 
> These were built commercially after WW-2 by Permoflux and 
> widely used in broadcasting for monitoring.
> 
> --
> Richard Knoppow
> Los Angeles
> WB6KBL
> dickburk at ix.netcom.com