[Milsurplus] BC-1004 Modification Question

[Al Klase]

Folks,

While we're on the subject, you might want to take a look at my Super 
Pro page: 
http://www.skywaves.ar88.net/commrx/Hammarlumd/SP-10/Super-Pro_SP-10.html

Hope you find it enlightening,
Al

Al Klase – N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/

On 8/29/2016 3:31 PM, Todd, KA1KAQ wrote:
> 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 <mailto: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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