[ARC5] ARC5 receiver audio output questions

[Bill Cromwell]

With my command receivers in my two and a half car 
garage/shack/shop/music hall I have plenty of volume from a speaker to 
hear the radio even when the television is playing and the windows are 
open to outside noise such as the neighbor's lawn mower. It won't rattle 
the windows like the 5 KW amplifier in the teenager's car - you know the 
one - sounds like artillery at ten paces.

73,

Bill  KU8H

On 04/11/2014 03:39 PM, Kenneth G. Gordon wrote:
>> On 4/11/2014 12:00 PM, Bruce Long wrote:
>>> I am building a combined ARC5 receiver power supply and audio amplifier.
>>>
>>> with low to moderate volume if a matching transformer is used.  I think this
>>> means the audio power output is something like 50 mW or lower.
> Excuse me, but, no! :-(
>
> It is 400 mW, and when the impedances are properly matched, that is
> enough audio output at full volume to blow the windows out of my shack, and
> my windows aren't made out of SaranWrap either.
>
> Sheesh...
>
> I have NEVER understood why all the old conversion manuals insisted on
> adding an audio preamp and a following, (supposedly) much more powerful,
> amplifier. It is just plain completely un-necessary.
>
> All that is REALLY necessary is to 1) replace the 12A6's 2 meg grid resistor,
> R-20, with a properly wired 2 meg audio-taper pot, and 2) to match the
> impedances properly.
>
> Kenneth G. Gordon W7EKB
>
> "Courage is being scared to death but saddling up anyway."--- John   Wayne
>
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