[Hammarlund] Old Hammarlunds - the Geissler modifications.

[Carl]

----- Original Message ----- 
From: "Richard Knoppow" <1oldlens1 at ix.netcom.com>
To: "Carl" <km1h at jeremy.mv.com>; <kgordon2006 at frontier.com>; 
<Hammarlund at mailman.qth.net>
Sent: Friday, April 15, 2011 6:05 PM
Subject: Re: [Hammarlund] Old Hammarlunds - the Geissler modifications.


>
> ----- Original Message ----- 
> From: "Carl" <km1h at jeremy.mv.com>
> To: <kgordon2006 at frontier.com>; <Hammarlund at mailman.qth.net>
> Sent: Friday, April 15, 2011 1:46 PM
> Subject: Re: [Hammarlund] Old Hammarlunds - the Geissler modifications.
>
>
>> He must have impressed somebody since in later years the USAF adapted and
>> adopted the Nuvistaplug to the SP-600. Supposedly it helped but I can
>> imagine it overloaded bad with a wide open first RF.
>>
>> Carl
>> KM1H
>>
>    Remember that RCA did a really heavyweight promotion of Nuvistors at 
> the time. They were widely used in a range of equipment at the time, 
> partly because they were small and comparitively low power. My Tek 453 
> scope uses them for the input stage and the plug-in mic amplifiers of my 
> ancient (and stolen) Ampex PR-10 recorder used a pair.
>    I've never had a Nuvisaplug for my SP-600-JX but suspect it wouldn't do 
> anything good.
>
>
> --
> Richard Knoppow
> Los Angeles
> WB6KBL
> dickburk at ix.netcom.com


Im very familiar with nuvistors having used them in designs at the time 
while at National.
ER ran an excellent feature story on the development and associated problems 
with them.

My current BA collection has several pieces that use them also and I dont 
consider my 453 a boatanchor.

Carl