[ARC5] [Milsurplus] BC-221AK Question

[Mark K3MSB]

Hi Ken

>> The cap is part 9-2, not 0-2 and it is supposed to be 0.001 uF.

Yes, my typos.   Too lazy to roll over to the bench and get my
glasses........     :-)

[image: image.png]

.... and thus the motivation for my question....

[image: image.png]

[image: image.png]

The internal HB Power Supply was a "Widow-Maker" Special......with leaky
caps!!!

I will rebuild the PS tomorrow and power it up (after dressing the
connections associated with the replacement components.....and using the
correct parallel capacitor.

73 Mark K3MSB




On Wed, Aug 27, 2025 at 7:46 PM Kenneth G. Gordon <kgordon2006 at frontier.com>
wrote:

> On 27 Aug 2025 at 18:56, Mark K3MSB wrote:
>
> > I have a BC-221 whose ID plate says  BC-221E.   It is not an E
> > variant.
> > From the tubes, front panel controls, and TM11-300,  I think it's the
> > AK variant.
>
> I have two -AKs here: unfortunately. in storage, not in the shack. :-(
>
> > Looking at the front panel,  what is supposed to be behind the two
> > antenna connectors?
>
> Well, only ONE is an antenna connector: the "other" one is a ground
> connector...or should be.
>
> > I tried discerning it from TM11-300.   I think it's supposed to be a
> > 150 H Choke (Part 24) in parallel
> > with a 0.01 uF cap (Part 0-2).
>
> The cap is part 9-2, not 0-2 and it is supposed to be 0.001 uF.
>
> >    Can anyone confirm?
>
> Well, a 150 H choke would be physically fairly large for a "small" choke.
> I would have to go to my storage building and open one of my -AKs up to
> check, and cannot do that just now.
>
> I hope Wayne can help. If all else fails, I'll make a run to my storage
> and take look as soon as I can.
>
> BTW, the -AK version is one of only two other versons which include AF
> modulation capability. None of the others have that. This makes the -AK a
> fully functioning signal generstor.
>
> Ken W7EKB
>
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