[Amps] 4CX15,000A screen PS

[John T. M. Lyles]

Chris
The Continental 816R series FM broadcast rig has a variant with 
4CX15,000A. I assume you didn't mean 4CX1500A. At their website 
http://www.contelec.com/ go to support, then look for manuals and 
download the training manual for this. You might find the screen 
power supply details there. CEC uses the trick of grounding the 
screen and putting negative screen V return and postive grid bias 
return on the filament of the tube, with an isolated filament 
transformer. It is conventional grid driven tetrode operation, but 
better stability via the excellent screen grid grounding for RF.

Otherwise, the screen power supply for such tetrodes (and the 
4CX10,000 and 4CX20,000 series) is quite conventional, most use a LC 
filter, single phase power supply (or three phase) and FWbridge 
rectifier. Most are not regulated in the broadcast FM rigs (class C) 
and just have a stiff bleeder resistance across the output of the PS.

73
John
K5PRO

>
>Message: 2
>Date: Thu, 8 Sep 2005 12:27:20 -0700
>From: "Chris" <rfcrazy at cox.net>
>Subject: [Amps] Screen Supply
>To: <amps at contesting.com>
>Message-ID: <000001c5b4ab$55245960$0301a8c0 at chriszfw9zp3ay>
>Content-Type: text/plain;	charset="us-ascii"
>
>Hello,
>
>
>
>Can anyone help me with a schematic for a screen supply for a 4cx15000a? Or
>point me in a direction in which I may locate one? I need a model reference.
>
>
>
>Thank you :-)
>
>
>
>Chris