[Milsurplus] Intercom amp

[Mike Hanz]

  The requested info is at 
http://aafradio.org/flightdeck/Interphone_systems.html about 2/3 the way 
down the page.  There is a link to the schematic and interconnection 
diagram.

As to the deployment date - from page 8R of 
http://aafradio.org/docs/UR_Digest_May_1944.pdf :

Difficulty:
Interphone amplifier BC-347 becomes Intermittent and at times the 
Amplifier goes out completely at altitudes above 15,000 ft.

Corrective Action:
Due to the numerous failures reported on this equipment, ARL, Wright 
Field, has developed a new Interphone Equipment AN/AIC-2 which corrects 
defects inherent in the RC-36. When sufficient quantities of the new 
equipment is available, interphone equipment in B-26-( ), B-17-( ), 
B-24-( ), and B-29-( ) airplanes now in service will be changed with 
this new item.  In the interim, frequent exchange of Vacuum Tube VT-99 
is suggested.

While I take KK5F's point about original usage, the AM-26 works very 
well as a post amplifier for rare sets you may wish to operate with a 
lower plate voltage.  I use an RL-5 amp for my RAT receivers in the same 
mode.  These days you have to preserve any which way you can.

73,
Mike

On 9/12/2010 5:41 PM, WA5CAB at cs.com wrote:
> Well, I based that on the fact that the only manual I have on it is dated
> 6/6/44 and does not show any supercession information.  On the other hand, it
> "officially" uses DM-32-A, not DY-2/ARR-2 and some BC-nnnn components.
>
> In a message dated 9/12/2010 4:25:23 PM Central Daylight Time,
> wh7hg.hi at gmail.com writes:
>> -----Original Message-----
>> From: milsurplus-bounces at mailman.qth.net
>> [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of WA5CAB at cs.com
>>> P/O AN/AIC-2 c. 1944.
>> I thought it was earlier but you're likely right.  As usual.  ;-)
>>
>> I had one many eons ago and thought it was too much a coincidence that it
>> resembled a command receiver so much.  Rather than fitting a Rx rack, it
>> goes on the Rx mount for the AN/ARN-5.
>>
>> Best regards,
>>
> Robert Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
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