[Hammarlund] Old Hammarlunds

[Kenneth G. Gordon]

On 12 Apr 2011 at 16:44, rbethman wrote:

> The SP-600 J, not JX came out in 1951 with no crystals.

I have a -JX1, which I have never fired up as it still has all its Black Beauties. 
I can hardly wait to get to it.

> They have one heck of selectivity!  One part non-crystal, then the
> remaining is a variable crystal type.

The Hammarlund crystal filter is, IMHO, the very best of the bunch....when it 
and the receiver have been properly aligned.

MUCH better than National's.

Ken W7EKB