Several tubes are built and specified for a specific customer or application
and later find use elsewhere.
There is no magic fence that says a particular tube will stop at 30, 40, 54,
108 MHz, etc. Note that those are usually 40-60's designs and later the
upper frequencies were more realistic.
Carl
KM1H
----- Original Message -----
From: "Fuqua, Bill L" <wlfuqu00@uky.edu>
To: "Fuqua, Bill L" <wlfuqu00@uky.edu>; "Kevin Adam" <n9iww@msn.com>;
<jtml@vla.com>; <amps@contesting.com>
Sent: Tuesday, June 07, 2011 9:42 PM
Subject: Re: [Amps] Any designs for 4CX1000A on 2m
> Can anyone explain why there are so many different Max Frequency
> specifications for the
> 4CX5000A?
> bill
> ________________________________________
> From: amps-bounces@contesting.com [amps-bounces@contesting.com] On Behalf
> Of Fuqua, Bill L [wlfuqu00@uky.edu]
> Sent: Tuesday, June 07, 2011 8:49 PM
> To: Kevin Adam; jtml@vla.com; amps@contesting.com
> Subject: Re: [Amps] Any designs for 4CX1000A on 2m
>
> Yes the amplifiers exist, what is interesting that there seems to be a
> number of different data sheets.
> Look at http://tube.be/4cx5000a.html as an example.
> http://www.rell.com/Pages/Product-Details.aspx?productId=9777
>
> bill
>
>
> ________________________________________
> From: Kevin Adam [n9iww@msn.com]
> Sent: Tuesday, June 07, 2011 8:24 PM
> To: Fuqua, Bill L; jtml@vla.com; amps@contesting.com
> Subject: Re: [Amps] Any designs for 4CX1000A on 2m
>
> the last time I checked it won't go there according to Eimac you 4cx1500
> to
> get there
> N9IWW
>
> -----Original Message-----
> From: Fuqua, Bill L
> Sent: Tuesday, June 07, 2011 8:20 PM
> To: jtml@vla.com ; amps@contesting.com
> Subject: Re: [Amps] Any designs for 4CX1000A on 2m
>
> I think the number on them is RS2014.
> 73
> Bill wa4lav
>
> ________________________________________
> From: amps-bounces@contesting.com [amps-bounces@contesting.com] On Behalf
> Of
> John Lyles [jtml@losalamos.com]
> Sent: Tuesday, June 07, 2011 7:12 PM
> To: amps@contesting.com
> Subject: Re: [Amps] Any designs for 4CX1000A on 2m
>
> That's impressive, I wonder how far they are derated the 4CX5000A at 220
> MHz, in that amplifier. I tried using the 4CX5000A in a 5 kW FM broadcast
> amplifier in the early 1980s and found it difficult, switched to 4CX3000A
> and then Eimac introduced the 4CX3500A, which was a natural at 108 MHz.
> I got the first tube for eval. from George Badger, and our product was
> introduced at NAB. Later, tetrode transmitter competitor still using the
> 5000A switched to the 3500A after we proved it could handle the power and
> the cathode was enough.
> It had similar base but lower internal inductance than 5000A, I believe. I
> never touched a 4CX5000A again.
>
> 73
> John
> K5PRO
>
>
>> That reminds me, I have a couple of 4CX5000A
>> 220 MHZ amplifiers in the garage.
>> They are large and the power supplys extremely heavy.
>> 73
>> Bill wa4lav
>
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