[Amps] Looking for a design for a single 4cx250b tube on 50 Mhz-six meters.

[craxd]

Bill,

That amp, which really said was an amateur amp, was mostly sold to the 
11 meter folks. The larger the numbers, the more they sold it for. I've 
seen it's schematic listed now on several amateur sites, less the text 
portions. Some were built however, with a band switch. Actually, that 
was supposed to be 600 PEP, which is way over what it should be. The 
ones I've actually had my hands on did about 450-500, but that was wide 
open. I wouldn't run it that way very long. Cut back to where it should 
be, it will run ok. I just dont like the screen and bias circuit in it 
that well. This can be changed though in a homebrew amp anyhow.

Bill Fuqua wrote:

>     The manual claims that a single 4CX250B will produce 600 watts 
> peak output. It has unregulated bias supplies as well.
> I wonder if that is figuring peak voltage squared divided by 
> resistance rather than PEP value.
>
> 73
> Bill wa4lav
>
> At 12:12 PM 10/12/2004 -0400, craxd wrote:
>
>> Ken,
>>
>> If six meters is all your wanting, no higher, I'd take a look at the 
>> way the old Pride amplifier was made. The schematic for it is all 
>> over the net. The input and output tank will need to be changed for 
>> six meters but the circuit is almost the same. Pride made two models 
>> of this (both the same), I think one was called KW-One and the other 
>> a 300 if I recall. It dont have the best regulation for the screen 
>> and G1 bias, but it did work up to 10 meters using one 4CX250B.
>>
>> http://cbtricks.com/Amp/pride/index.htm
>>
>> Will Matney
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