[Amps] Ug2 stabilization in TMN linear amp

[Peter, PE1E]

Gotcha !, thanks.

Peter, PE1E

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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 at 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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