[Amps] Initial RF testing of 4CX1000A amplifier

[TexasRF at aol.com]

Makes for an excellent method so switching to standby. Also, if a fault in  
the anode circuit happens and the anode voltage is removed, the screen 
voltage  needs to be switched off asap to prevent tube damage.
 
The same switching circuit can do both jobs.
 
73,
Gerald K5GW
 
 
 
 
In a message dated 11/6/2013 9:36:14 A.M. Pacific Standard Time,  
dj7ww at t-online.de writes:


What  is the reason to have the screen unconnected from its voltage  or
switched?

73
Peter

-----Original Message-----
From:  Amps [mailto:amps-bounces at contesting.com] On Behalf Of Ian White

The  bleed resistor is not part of the power supply. It is installed
close to  the tube itself, connected directly between the screen grid and
ground  (cathode). Its purpose is to prevent the screen grid from
floating  unconnected during the few milliseconds while the screen relay
contacts are  in motion between the RX and TX positions.  

_______________________________________________
Amps mailing  list
Amps at contesting.com
http://lists.contesting.com/mailman/listinfo/amps