[Amps] VTX-X118 Tetrode mytery tube?

[Shane Youhouse]

Rebranded 4CX1500.


--Shane
KD6VXI



On Mon, 04 Apr 2011 09:08:50 -0700, Damon Stewart <wsmc551 at gmail.com>  
wrote:

> On 4/4/2011 1:38 AM, KL7RA wrote:
>> Originally the new AP8410 used the Eimac 4CX1000A tubes but they made a
>> switch to the VTX-X118. Seem to be a mystery tube, can't find the spec  
>> sheet
>> and never heard of them.
>>
>> Anyone know anything about this tube? My guess is Alpha used the  
>> 4CX1000A
>> but got them with a higher grid rating?  It looks like this tube number  
>> is an Alpha
>> part number to me.
>>
>> 73 Rich KL7RA   Alpha amp owner
>>
>> > From Alpha:
>> The amplifier uses the Alpha Power brand VTX-X118 tubes, a ceramic,  
>> external-anode,
>>   indirectly heated tetrode that, unlike the excellent Eimac 4CX1000A,  
>> is qualified to handle
>> the grid current that might be experienced in the AP8410.
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>
> For what its worth.  The most grid current I have ever seen out of my
> 8410, even when testing its limits, has been less then 1mA.   In the
> serial data string the grid current is read in tenths of a mA.  I
> usually see somewhere in the 0.2mA to 0.5mA range with CW output well
> over LL.
>
>  From many of the reports I have seen and my own testing,  the VTX-X118
> seems to be a slightly improved Chinese version of the Eimac 4cx1000a.
>
> Damon Stewart, KJ7E
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-- 


It's a sad state of affairs when your tubes don't have handles but your  
dummy load does.