Id be tempted to hear Ians view of the 2nd one particularly since it is so dear
to his heart....2M IMD in his back yard.
Carl
----- Original Message -----
From: Mike Tubby
To: Geoff
Cc: rfamplifiers@yahoogroups.com ; amps@contesting.com ;
ham_amplifiers@yahoogroups.com
Sent: Monday, January 02, 2012 1:46 PM
Subject: Re: [Amps] [rfamplifiers] 4CX5000/10000 Screen power supply help
needed
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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