[Milsurplus] BC-1004 Modification Question

[Todd, KA1KAQ]

We have it in the Receivers section of AMfone.net if you ever need it fast,
Ken:

http://amfone.net/Amforum/index.php?topic=15703.0

Ralph/W3GL who posted this info actually used these sets back in WWII as I
recall.

There are a few other excellent threads on there discussing the WWII and
earlier Super Pros back to the original SP-10. Incredible receivers for
their time, and still a lot of fun and performance today.


~ Todd/KAQ

On Mon, Aug 29, 2016 at 1:56 PM, Kenneth G. Gordon <kgordon2006 at frontier.com
> wrote:

> On 29 Aug 2016 at 12:06, Joe Connor via Milsurplus wrote:
>
> > I'll also spruce up the engraved lettering on the front panel. I am
> always amazed
> > at what a big difference that makes. Cosmetically, this is one of the
> nicest
> > SP-200s I've seen, so I plan to do it up right.
>
> I have always loved those old Hammalunds. They are kind of "military
> truck-ish" looking for
> one thing. And I liked the way they work too.
>
> Hammarlund published a mod for those receivers which reduced the drift
> very noticably. I
> have the bulletin here somewhere, but what it amounted to was a 3 pfd cap
> with as large a
> negative temp coeffecient (like 1500 ppm) as possible soldered across the
> HFO tuning cap.
> As I remember it, it was placed on top somewhere where it would receive
> heat from nearby
> tubes.
>
> I'll try to dig that out.
>
> Ken W7EKB
>
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