[ARC5] BC-221 and LM on eBay

[Richard Knoppow]

    Well, I spoke too soon. After running a couple of hours the 
modulator stopped. There is not much to this circuit. Maybe an 
intermittent mica capacitor. I tried resoldering the joints 
between the cap and the choke. No luck. Eventually, I will find a 
replacement cap and try it. Not the easiest place to get it to 
solder but I would really like to get it working.

On 3/31/2022 3:27 PM, Richard Knoppow wrote:
>     This thread on the BC-221 caused me to take mine off the 
> shelf and fire it up. Mine is a BC-221 AN. I've had it for 
> decades and don't any more remember buying it. It has an AC power 
> supply (would have to look at the type number. In the past I've 
> cleaned it but don't remember having had to do any repairs to it. 
> It seems to work fine but the modulator didn't work. I looked at 
> the schematic and decided it might have a bad capacitor. I took 
> out the chassis and poked at the wiring. Decided the capacitor  I 
> was suspicious of was too hard to access, at least until I was 
> sure I had a replacement. However, I did poke and move it a 
> little. Put the think back in its case and found the modulator 
> now works fine.
>

-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL