[Hallicrafters] Thanks for the vacuum tube info.

[lrlayton at cox.net]

Carl,

Thanks for the link to the Nuvistaplug info. It looks like I have one, but didn't know it.  No markings except for a dab of yellow paint  on the base just above the pins, but looks professionally made and seems identical to the one shown in the SP-600. Has two 6DS4 nuvistors and was installed in the first RF stage (6CB6) of a Hallicrafters SX-88 I have been restoring for the last couple of years.

Les Layton


---- Carl <km1h at jeremy.mv.com> wrote: 
> You need a system NF of 6-8dB to get below the external noise on 10M. 
> The 75A4 I rebuilt in 1965 with a 6GM6 RF and 7360 mixer measured 6.5dB 
> and is darn near overload proof.
> 
> The Nuvista-plug was a commercial item that was copied by many. 
> http://www.mines.uidaho.edu/~glowbugs/receivers.htm
> 
> Forget about the 6J6 in a cascode circuit as it has a common cathode. 
> You could always use 2 with sections in parallel for signal handling 
> experiments.
> 
> Carl
> KM1H
> 
>