The 3 didgit EIA code on the tube will tell you who actually built it.
Carl
KM1H
----- Original Message -----
From: "Roger (K8RI)" <k8ri@rogerhalstead.com>
To: <amps@contesting.com>
Sent: Friday, January 27, 2012 4:23 PM
Subject: Re: [Amps] 4CX1000A
> On 1/27/2012 3:46 PM, Roger Dixon wrote:
>> Hi Chaps,
>> I recently completed my 50MHz 4CX1000A amplifier. However the Eimac pull
>> I
>> have had for a while suffers from excessive secondary emission.
> Are you familiar with Tetrode tuning? At what level of screen current
> do you start getting secondary emission?
>
>>
>> The question. I have recently obtained a NOS 4CX1000A. However, despite
>> being offered as an "Eimac" NOS, both the valve and the original box are
>> branded General Electric. Does anyone have any views as to the
>> quality/specification of a valve such as this that is non Eimac branded?
> I've not heard of any problems with GE constructed 4CX1000A's. GE has
> built a lot of high powered tubes in the past and particularly for the
> military.
> I'd not be concerned about a GE tube, unless some one comes up with
> information on a problem with those tubes.
>
> 73
>
> Roger (K8RI)
>> TIA
>> Roger - G4BVY
>>
>
>
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