[ARC5] Potentiometer value needed

[Jim Falls]

Sounds good, Ken! Thanks. Prior owner yanked out the IF Cores, so I'm pretty well stuck there. I've used it for beacon hunting, but the "volume control" would make my ears ring if I sneezed on it. 

I hope to build a magnetic loop in the future to knock down some of the local QRM. 

Cheers!
Jim K6FWT
CBLA #37

> On Aug 9, 2014, at 14:47, "Kenneth G. Gordon" <kgordon2006 at frontier.com> wrote:
> 
>> On 9 Aug 2014 at 14:21, Jim Falls wrote:
>> 
>> I have a lightly hacked (12 filament mod) silver BC-453-B with an on/off switch,
>> volume control and phone jacks in the front cubby hole. Current pot is far to
>> touchy and probably linear taper. What's a good value audio taper to use for
>> hi-Z phones/speakers? I'd like to try it with my TCS and others.
> 
> Hi, Jim:
> 
> That "gain control" is a combination RF/IF gain pot acting on the cathodes. I 
> have found that a 50K log (audio) taper pot works well there.
> 
> Since you are, apparently, going to use that BC-453 as a "Q-5er" for your 
> TCS receiver, I suggest that you add an AF gain control to it.
> 
> Use a 2 megohm (or a 1 meg) log-taper pot to replace R-20, the 12A6 grid 
> resistor, then connect the wire that attaches to the 12A6 grid connection 
> which comes from the flat .006 mfd capacitor to the pot wiper.
> 
> Ken W7EKB