Indeed I do. I read it a long time ago so I must have forgotten. Thank you
for mentioning it. I've managed to modify my custom transformer order as it
hasn't been made yet.
I changed it to 2x140V (280V) under full load so a minimum of ~393V DC
after a rectifier. I say minimum because my supply AC varies between 230V
up to 245V (depending on how much local solar generation is happening, if
I'm running on my inverters or tied to the grid). Also it will run a bit
under half it's rated load.
So the DC on the regulator input will be from 393V DC up to as high as 420V
DC. such high voltage is not ideal, but acceptable.
I'm currently running at similar voltage.
73,
Luk - SP4IT
On Mon, 2 Dec 2024, 22:54 Michael Tope, <W4EF@dellroy.com> wrote:
> If you are talking about the circuits described in the article by G3SEK
> (QEX October 1997).., then you better take another look. In the article he
> advises that the input voltage should be at least 40V higher than the
> desired regulator set point. This make sense. A shunt regulator needs a
> series ballast to work against.
>
> There is a copy of the G3SEK article here:
> https://www.tmchistory.org/tmc_restoration/PAL-500/power and protection
> for modern tetrodes.pdf
>
> 73, Mike W4EF........................................................
>
>
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