[Amps] Filter Capacitors

[Rob Atkinson]

I'm trying to find out more about this but so far have only found
instruction on avoiding ripple frequency resonance with a choke input
filter.  What were the old handbooks you looked at?  I was looking at
the '51 ARRL handbook.  Thanks,

73

Rob
K5UJ

On Fri, Apr 13, 2012 at 9:40 AM, Carl <km1h at jeremy.mv.com> wrote:
> A choke is not a good idea unless great care is taken to eliminate/minimize
> the switching spike which is present with tube and SS rectifiers. A scope is
> mandatory especially if the choke and caps are not well overated for
> voltage.
>
> For decades this spike has been mostly ignored in literature and finally saw
> daylight again when more boatanchor amps were being built and then the audio
> types got involved and developed their own versions of reality.
>
> I first noticed it about 10 years ago when checking ripple in a 2700V PS and
> had to dig into the old handbooks and QST's and saw the "ancients" knew all
> about it. I hadnt built a choke input supply since the late 50's and that
> was simply using WW2 surplus from a BC-610 so obviously the design work was
> already done.
>
> Carl
> KM1H
>