[Hallicrafters] Thanks for the vacuum tube info.

[Carl]

Voila Les!

If you decide to sell it Im interested as Id like to run some modern 
tests on it. Ive a fully equiped HP/Tek lab here including HP-8970A NF 
Meter.

Carl

----- Original Message ----- 
From: <lrlayton at cox.net>
To: "Carl" <km1h at jeremy.mv.com>
Cc: <Hallicrafters at mailman.qth.net>
Sent: Wednesday, April 15, 2009 2:31 PM
Subject: Re: [Hallicrafters] Thanks for the vacuum tube info.


> 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
>>
>>
>