Peter, there is usually a hefty bleeder resistor on the output of this type
G2 power supply. The bleeder resistor tends to stabilize the G2 voltage.
The LC filter circuit is inherently more stable than a C only circuit as
long as there is a reasonable current load.
This method of stabilization is ok for cw or digital work but for SSB, not
up to the modern practice of using a GM3SEK tetrode board.
73,
Gerald K5GW
In a message dated 9/4/2009 9:17:49 A.M. Central Daylight Time,
p.m.vandaalen@gmail.com writes:
I, being a rookie in linear amp building, am building the W5TMN TMN HF
4CX1500B linear amp ( grounded screen ).
Neither in TMN's power supply design nor within the amp circuit itself can
I detect any stabilization of Ug2.
( The Ug2 power supply design has a choke input for filtering ( LC input, 6
Hy, 90 Ohm or less, I have 60 Ohm, 800 mA, bit overkill, yes I know ) )..
Why did TMN not design a usual screen stabilization ?
Not necessary because the screen is grounded ?
But if so, what then as to the stabilization of the floating negative
cathode potential ?
Is it safe ( with respect to Ug2 ) to build the amp exactly as designed by
John Ehler ?
I appreciate any help.
I am heavily interested in the Ug2/Ug1 stabilization theory.
Peter, PE1E.
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