[ARC5] BC-455 not working

[Tom Lee]

Standard "Troubleshooting 101" says to check voltages first. Caps 
(especially Black Beauties -- just replace any of those you encounter) 
leak, carbon comp resistors drift upward, etc.

Silver mica caps can develop a problem from electromigration of silver, 
causing anything from high noise to near shorts. Ones hidden away inside 
cans can sometimes be missed.

If all that checks out ok, then you start looking for things along the 
signal path. Is the LO oscillating? On frequency? And on it goes. But 
start at the beginning. Keep peeling the layers of the onion. As the old 
saying goes, after you've shed enough tears, you'll be done.

--Tom

-- 
Prof. Thomas H. Lee
Allen Bldg., CIS-205
420 Via Palou Mall
Stanford University
Stanford, CA 94305-4070
http://www-smirc.stanford.edu
650-725-3383 (public fax; no confidential information, please)

On 1/13/2018 1:43 PM, kg4kgl at gmail.com wrote:
> I need help. This modified receiver was converted to 12v filament operation. The BFO van had a screw missing, so I assume someone was in there. I removed it it, but it looks stock.
>
> I am getting pretty much nothing on the headphones. I can adjust the trimmers on the IF cans and get a higher background noise.
>
> Where should I be looking next?
>
> Tnx,
>
> Robert
> KG4KGL
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