[Hammarlund] HQ-129 and 717A mod and SP-600

[Todd, KA1KAQ]

Ah, yes...the famous 'Nuvistor Plug' mod. Would love to find one, or
at least see the documentation. Heard wonderous things about this over
the years...

~ Todd,  KA1KAQ

On 11/7/07, Kenneth G. Gordon <kgordon2006 at verizon.net> wrote:
> On 7 Nov 2007 at 14:01, jeremy-ca wrote:
>
> > For that matter why not a pair of 6CW4's or 7586's ? The latter
> > especially are rather available.
>
> I suppose you are familiar with that mod in which two
> 6CW4s in cascode are substituted for the first RF amp tube
> in the SP-600? I think it was either a factory or a military
> mod. It was built on a small bit of board and simply plugged
> into the 1st RF amp socket. It increased the signal-to-noise
> ratio by between 3 and 9 db according to tests.
>
> I have that mod in PDF format up on the Glowbugs site.
>
> Ken Gordon W7EKB
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