[ARC5] 10 meter BC-454 - more info

[D C _Mac_ Macdonald]

If you have a defunct octal tube base or equivalent 
"plug" around, put an equivalent resistor across the 
filament terminal pins (2 & 7 ?) and then you could 
remove either the RF amp or mixer and maybe further 
localize your problem.
 
* * * * * * * * * * * 
* 73 - Mac, K2GKK/5 * 
* (Since 30 Nov 53) * 
* k2gkk at hotmail.com * 
* Oklahoma City, OK * 
* USAF & FAA (Ret.) * 
* * * * * * * * * * * 
 
 
 

 

> From: kgordon2006 at frontier.com
> To: arc5 at mailman.qth.net
> Date: Tue, 12 Feb 2013 00:38:43 -0800
> Subject: [ARC5] 10 meter BC-454 - more info
> 
> The microphonics are not centered in the BFO.
> 
> I turned it off, and still have them.
> 
> I also unplugged the RF amp tube, which also turns off the mixer, and no 
> longer have any microphonics.
> 
> It looks, so far, as though the problems are centered around the mixer/HFO 
> tube.
> 
> Kenneth G. Gordon W7EKB
> 
> "Courage is being scared to death but saddling up anyway."--- John Wayne