On Jul 1, 2006, at 10:20 PM, wc6w@juno.com wrote:
> Wynand & Rich,
>
> In an impractical application, a Kahn envelope elimination and
> restoration amplifier, the 4-250A is capable of a smidge over 2KW PEP
> just as in plate modulated AM operation. The max plate voltage in
> this instance would be 6KV but, only intermittently.
was the plate/anode white hot?
>
> 73 & Good afternoon,
> Marv WC6W
>
> -- R L Measures <r@somis.org> wrote:
> W. F. --- With its max peak emission of 1.3a and a 4500v anode
> supply
> using g-g config., my guess is that a 4-250A has enough stuff to do
> 1000w-out PEP in SSB service provided that it is tuned up with a
> tuning pulser - or 50wpm dits, and the operator does not speak too
> loudly into the mic.
>
> On Jul 1, 2006, at 6:15 AM, W.F van Wyk wrote:
>
>> I have been hearing claims at the local flea markets here in South
>> Africa
>> that a single 4-250A valve is capable of between 800 - 900 watts
> in
>> ham band
>> amplifier application.
>>
>>
>>
>> Now I have used these myself in a number of homebrew amplifiers,
>> and never
>> have I even come close to that type of output from a single 4-250A.
>>
>>
>>
>> Have I missed something in my amplifier education or is this High
>> Grade
>> Fertilizer which I currently believe it is.
>>
>>
>>
>> The local experts claiming this indicate voltages on the plate in
>> the region
>> of 5,000 Volts and get a blank look when I enquire about IMD and
>> splatter.
>>
>>
>>
>> Now I am aware on the specification sheets for this valve RF power
>> above 800
>> watts are indicated under certain conditions but I still have to
>> see that
>> put into practice in a Ham amplifier say for normal HF band usage.
>>
>>
>>
>> Please steer me in the right direction here.
>>
>>
>>
>> Thank You
>>
>>
>>
>> Wynand van Wyk (ZS6ARF)
>>
>> _______________________________________________
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>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>
> R L MEASURES, AG6K. 805-386-3734
> r@somis.org
>
>
>
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R L MEASURES, AG6K. 805-386-3734
r@somis.org
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