[Amps] tetrode reverse screen grid current

[Hsu]

Hi Carel,
   Your schematic diagram very clever， thanks share with me.
    Hsu

-----原始邮件----- 
From: Carel, pc5m
Sent: Monday, January 30, 2012 5:20 AM
To: amps at contesting.com
Subject: Re: [Amps] tetrode reverse screen grid current

Hi, I am using some sort of shunt/linear circuit for grid supply (negative)
in my tetrode amplifier.

For the sake of this discussion I  just adapted the schematic (reversed
diodes and replaced pnp for npn's...) and I think it would give a starting
point of designing something for screen regulation.

I will source current via T1 and it can sink current through D1, T2 and T3

http://www.pc5m.net/images/160mts-th289_pa/pos%20screen%20supply.pdf

Of course you need to change circuit values for higher voltages/currents,
but the idea should be valid.

Gl, Carel, pc5m

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of John Lyles
Sent: zondag 29 januari 2012 21:44
To: Hsu
Cc: amps at contesting.com
Subject: Re: [Amps] tetrode reverse screen grid current

I'm think you could work out an automatic circuit that sensed when to
load the supply, when current is coming back into it. That is
essentially a shunt regulator of sorts. Just more complexity than a
fixed Resistor. Living with reverse current at certain power levels is
like living with a mother-in-law.....
73
John
K5PRO

On 1/28/12 11:41 PM, Hsu wrote:
> I have a thought about shunt bleeder resistance ,If we use a HV MOSFET
> seial a resistor to replace it, when the negative screen current happened,
> control the total resistance so the screen voltage still constant, Is it
> a good idea?
> 73!Hsu
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