[ARC5] ARC5 receiver audio output questions

[Geoff]

Yeah, for CW and space shuttle audio AM you dont need much fidelity, just 
run the 12A6 wide open.

OTOH if you want to listen to high quality ham or BC AM then feed the 
detector load into a nice preamp/PP amp of 10W or more. You benefit from 
much lower distortion to begin with using PP and then run the gain control 
down to a comfortable level for even lower distortion and into a quality 
speaker.

Carl


----- Original Message ----- 
From: "Bill Cromwell" <wrcromwell at gmail.com>
To: <arc5 at mailman.qth.net>
Sent: Friday, April 11, 2014 3:54 PM
Subject: Re: [ARC5] ARC5 receiver audio output questions


> 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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