-----Original Message-----
From: Carl
Sent: Thursday, August 02, 2012 5:51 AM
To: Rob Atkinson ; Jim Thomson
Cc: amps@contesting.com
Subject: Re: [Amps] The dilemma of Tx tube
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
### Forget AB-1. I never did see a 4-1000 in AB-1.
What did you measure for IMD on a 4-1000 in GG.
My tuned inputs were dead on back then. They consisted
of Millen 69046 tuneable slugs + silver mica's. One per band,
and bandswitched. The tuned inputs for 80-15m were next to the socket.
Every SA plot I saw depicted lousy IMD. Any 3-500Z amp was better than a
GG 4-1000.
## back then, nobody ran that tube at 1200w out and 3 kv.
Jim VE7RF
----- 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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