[ARC5] Added 6F6 audio stage...Aircraft Interphones

[Geoff]

It may not have "amplified" the signal level but like any splitter type unit 
it provided the same output to up to 10 headphones as if they were each 
connected to a seperate radio. In that case it fits its description as an 
amplifier and a 6F8 is far from a wimpy tube.

The same principle was used on ships to hook multiple receivers to one 
antenna.



----- Original Message ----- 
From: "Mike Morrow" <kk5f at earthlink.net>
To: "ARC-5 List" <arc5 at mailman.qth.net>
Sent: Friday, October 19, 2012 9:49 PM
Subject: Re: [ARC5] Added 6F6 audio stage...Aircraft Interphones


> Dave wrote:
>
>> I've never understood this issue of adding audio stages to Command Set
>> receivers.  I've been playing these sets stock using matched speakers
>> for decades.  They have all the audio I could want, and I'm half-deaf...
>
> The single-tube AF output stages of the MF/HF command set, VHF command 
> set,
> liaison set, radio compass, and interphone microphone amp could be fed to
> approximately ten interphone stations, each capable of selecting any of
> these AF sources and hearing it with headphones in a very noisy 
> environment.
> The interphone amp in all common WWII-era aircraft interphones (until the
> late-war AM-26/AIC, part of AN/AIC-2) did not provide further 
> amplification
> of any receiver's AF output, even one that is connected to ten headphones.
> The weak little VT-99 (6F8) of the common RC-36/BC-347-* single-tube
> interphone amp was always connected simultaneously to all headsets.
>
> So Dave's statement seems necessarily 100 percent accurate, even when a
> speaker in a quiet area is substituted for those ten headphones working
> against aircraft ambient noise.
>
> 73,
> Mike / KK5F
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