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Re: [Amps] The dilemma of Tx tube

To: "Rob Atkinson" <ranchorobbo@gmail.com>, "Jim Thomson" <jim.thom@telus.net>
Subject: Re: [Amps] The dilemma of Tx tube
From: "Carl" <km1h@jeremy.mv.com>
Date: Thu, 2 Aug 2012 08:51:40 -0400
List-post: <amps@contesting.com">mailto:amps@contesting.com>
And Jims "assumptions" that a 4-1000A always has poor IMD is just plain 
wrong. In AB1 grid driven start off with a set of Ians tetrode boards or 
similar before assuming anything.
In GG it will be about 5-6dB better if you get the input network working 
properly.

Carl
KM1H


----- Original Message ----- 
From: "Rob Atkinson" <ranchorobbo@gmail.com>

Eimac issued engineering newsletter FCJ-59D2 superseding 59B5 which
set forth an exception for the 4-1000A as a high mu triode provided Ep
is at least 3 KV.  It listed typical operating conditions.

73

Rob
K5UJ



On Thu, Aug 2, 2012 at 3:15 AM, Jim Thomson <jim.thom@telus.net> wrote:
> Date: Wed, 1 Aug 2012 19:37:39 -0500
> From: Rob Atkinson <ranchorobbo@gmail.com>
> Subject: Re: [Amps] The dilemma of Tx tube
>
> The eimac triode connected g.g. cathode driven data sheet for the 4x1
> has specifications for 3, 4 and 5 KV.
>
> Rob
> K5UJ
>
> On Wed, Aug 1, 2012 at 4:07 PM, <Gudguyham@aol.com> wrote:
>>
>> If I am not mistaken, the 4X1 "typical" GG service is rated at 3KV. Pump
>> it up with the proverbial "pole pig" power supply at 6KV and something 
>> has
>> to go out of spec. Most likely IMD?
>
>
> ##  If you looked at any Eimac catalog  from the  1960-1995,  you WON’T
> see  any GG  specs for a 4-1000.  I mean with screen + grid  bonded to 
> chassis, and
> run as a high MU triode.    Einac did list some GG  specs for hams
> in the odd rag  like CQ  once in a while... like for 3-4-5 kv.   That was 
> just a courtesy
> thing.  No ham was gonna buy a brand new Eimac 4—1000 anytime soon.  For 
> less  money,
> you could buy a NEW 3-1000Z.... which IS   rated for GG, and also rated up 
> to 6 kv in GG.
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