Hsu,
You can make a good shunt screen stabiliser using an op-amp and a
tetrode, this was done many times for 4CX250B, 4CX1000A etc. before the
Tetrode Boards from Ian G3SEK...
See here (second half of article):
http://www.agder.net/la8ak/d23.htm
and here:
http://www.qsl.net/g3uvr/4cx250/G4AJW-psu.pdf
for the 4CX10000D you would need a bigger tube ;-) The BBC
long-wave transmitter (198KHz) used to use a 4CX1500A as the shunt
screen stabilizer for the 250KW tubes made by Thompson ESF.
I'm just not sure which tube you should select for the job... perhaps
someone on the list can make recommendations...?
Mike G8TIC
On 02/01/2012 16:29, Geoff wrote:
> A low mu glass triode as a series pass tube for low cost home brew.
>
> Carl
>
>
>
> ----- Original Message -----
> From: Hsu
> To: amps@contesting.com
> Cc: ham_amplifiers@yahoogroups.com
> Sent: Sunday, January 01, 2012 10:43 PM
> Subject: [rfamplifiers] 4CX5000/10000 Screen power supply help needed
>
>
>
> Happy newyear to everybody!
> I have no experience on building over 2kW amplifier.I'll try this project
> this year.
> I just get a brand new socket and will oredr some parts after new year.
> I think the regulated screen supply to mess with too.
> I study DC9DZ 4CX10000D amplifier project,
> DC9DZ use expensive high power and rare zener diode in serial as screen
> shunt regulator power supply ,
> but I think it is expensive and poor dynamic spec and bad IM3.
> I think the screen power supply based on G3SEK's design is the best, but as
> 4CX10000D and 4CX5000's sceeen
> PS is difficult , too much power and too high voltage , even parallel and
> serial over 10 MOSFETs. Any suggestion?
>
> 73!Hsu
>
>
>
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