[Milsurplus] BC-1004 Modification Question

[Kenneth G. Gordon]

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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