[ARC5] ANB-H-1A receivers, repairable?

[hwhall@aol.com]

Thought I'd share what I've found thus far. Peeled off the shiny trim ring, drilled out six tiny brass rivets & all that has revealed the mini-speaker cone. Not sure what to do next. Seems like there has to be a sort of speaker basket analog to hold the cone, voice coil, etc. inside the outer shell. There's a rivet head or two on the outer shell that may be responsible for holding a "basket" in place.

This one is no doubt going to be non-repairable by the time the learning process is over with it.

Wayne
WB4OGM

On Thursday, October 23, 2025 at 02:16:08 AM MDT, 1oldlens1 <1oldlens1 at ix.netcom.com> wrote: 

I am quite familiar with the kind you mean. Some have bakelite diaphragms and some metallic (probably aluminum) unfortunately both are held by presses rings or collars.  I am not remembering rhe correct terms but you will I think understand what I mean.  These can be pried off to open the cases but I don't know of a sure fire method of restoring them.  It occurs to me that the rings could be cut in half, to remove them without bending or distorting them and replaced using superglue or other cement.
   If the phone measures open its most likely the transformer.  The elements ate 8 ohm Miniature speakers transformed to 300 ohms for the military version. Permo-flux made commercial versions in both low and medium impedance including stereo versions.  The internal transformers are very small. If the voice coil is open I think its a list cause.
   It has also become difficult to find replacement headbands, ear pads, cards, etc.  These are very high quality phones designed at the Harvard acoustics lab to obtain high articulation in aircraft communication systems.  ANBH stands for Army-Navy-British-Headphone.  I am describing the ANBH-1. The earlier ANBH uses a different and smaller element.  I have not been able to find a way of disassembling them without destroying them. 

Sent from my Galaxy
Richard Knoppow 
Los Angeles
WB6KBL


-------- Original message --------
From: hwhall--- via ARC5 <arc5 at mailman.qth.net> 
Date: 10/23/25 12:26 AM (GMT-08:00) 
To: ARC-5 List <arc5 at mailman.qth.net>, Milsurplus Listserv <milsurplus at mailman.qth.net> 
Subject: [ARC5] ANB-H-1A receivers, repairable? 

Has anyone perhaps figured out how to open up an ANB-H-1A headset receiver (these are the metal-body versions) so as to try to repair them?  I have one that is open-circuit.

Wayne
WB4OGM
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