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

[Bill Fuqua]

Wide open, does that mean class C SSB?
73
Bill wa4lav


At 03:10 PM 10/12/2004 -0400, craxd wrote:
>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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>>
>>
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>
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