[Amps] Filter Capacitors

[Carl]

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


----- Original Message ----- 
From: "Rob Atkinson" <ranchorobbo at gmail.com>
To: "Roger (K8RI)" <k8ri at rogerhalstead.com>
Cc: <amps at contesting.com>
Sent: Thursday, April 12, 2012 11:21 PM
Subject: Re: [Amps] Filter Capacitors


> Like Ron said, choke input filter = good idea.
>
> Rob
> K5UJ
>
> On Thu, Apr 12, 2012 at 10:07 PM, Roger (K8RI) <k8ri at rogerhalstead.com> 
> wrote:
> .
>>
>> Of course you can go whole hog and end up with a 100 or more mikes, BUT
>> at that point you now have a small bomb under the hood.
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