RE [R-390] Nuvistaplug?

[Mark Huss]

I'd beleve it about the overload.  Just wondering if theree would be a 
significant improvement in cases where this is not a concern.

Steve Hobensack wrote:

>  I've tried other tubes. I always go back to the 6dc6. It's resistant 
> to overload especially on strong nearby stations. The nuvistor mod 
> would work great for an r-390/sp-600 more or less dedicated to 14 mhz 
> and above. A nuvistor would make a great 10 meter receiver. I use a 
> 6dc6 in my sp-600 also. Just have to touch up the rf slug.
> ....Steve...N8YE
>
> Message: 1
> Date: Thu, 22 Dec 2005 21:21:08 -0500
> From: Mark Huss <mhuss1 at bellatlantic.net>
> Subject: [R-390] Nuvistaplug?
> To: R-390 at mailman.qth.net
> Message-ID: <43AB5F14.4030506 at bellatlantic.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Here is one for all the experts.  A plug-in modification for SP-600's
> was the Nuvistaplug.  This was a replacement for the first RF amplifier
> in SP-600 that substituted a pair of 6DS4's in a cascode circuit.  The
> resulting 6 to 9 dB increase in Signal to Noise level made the SP-600
> sound like a new receiver.  My brother recalls that there was a similar
> modification using a 6CW4 for the R-390A, popular with MARS operators.
> I happened across the schematic today, and it looks like with changing
> one pin in the Nuvistaplug, you could drop in the replacement for the
> 6DC6.  This should increase the signal to noise level of the first RF
> Amp.  So has anybody even heard of this being attempted?
>
>
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