Re: [Amps] Henry 2k-4 HV inductor

[donroden@hiwaay.net]

Some good points, but I have used parallel caps on HV input inductors  
with great results.    Collins used a parallel capacitor on their  
power supplies for the Collins KWM2 transceiver.   Select the proper  
capacitor from a handful of close values, and the voltage goes down to  
800 volts with very little ripple.
If the capacitor opens up, the voltage soars to 1050 unloaded then  
drops to 800 under load.... not good regulation.
So I used tuned inductors on HV supplies with similar results.

for lower voltage supplies ... 300 volts or so, I built a FET series  
regulator to knock down the ripple.
Don R



Quoting Ron Youvan <ka4inm@gmail.com>:

> Elliott W6EL L wrote:
>
> > Alright, there were some really interesting comments on this question,
> > thank you all!
> > If I were to ditch the hV choke and keep the plate transformer, can I
> > simply add additional caps in parallel with the existing 20uF cap? Will an
> > extra 20-40uF do the trick? I see a lot on eBay coming out of Russia.
> > Also, should I be worried about the increase of inrush on power-on?
> > I like the idea of ditching the choke, it really does seem unnecessary.
>   The primary advantage of using a L or Pi filter (rather than a brute
> force {just capacitance} filter) is the reduced amount of energy stored
> in capacitance which is undesirable when an arc is experienced.
> The extra storage energy and the lack of inductance (which reduces  
> the amount of extra current from the rectifier/s) add to the amount  
> of energy that shall be dissipated in the tube/s or other fault.
>   It is a safety thing.  (for the tube/s)
>
>   Pi filters are seldom used for low Voltage supplies (100. Volts  
> and under) because little "arcs" at these Voltages.
> --
>   Ron  KA4INM - Youvan's corollary:
>                 Every action results in unwanted side effects.
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