[Amps] KK5DR's ferrite loaded

[MIKE DURKIN]

So this Rod loaded Plate choke is sold on the bay. Is this thing meant for under 2kV are you saying??

I dont see any feedback about it melting down ..

 

http://tinyurl.com/ydb77bc


Mike

KC7NOA
 
> Date: Wed, 20 Jan 2010 18:27:06 +0100
> snip
> To: manfred at ludens.cl
> CC: amps at contesting.com
> Subject: Re: [Amps] KK5DR's ferrite loaded
> 
> Manfred Mornhinweg wrote :
> >
> > That's right. And in the situation originally described, a plate choke
> > wound on a ferrite rod, the permeability of the material isn't very
> > relevant at all, because the total equivalent permeability of teh entire
> > path is dominated by the air, through which the flux lines have to
> > return. This allows obtaining almost the same inductance with a material
> > having pemeability 10, than with one having 1000! So it's a good case
> > for using a low permeability material, even as low as what's provided by
> > powdered iron. The 43 material with its 850 permeability is certainly
> > out of place here.
> >
> > 
> Hi, Manfred,
> You explained why a plate choke wound on a ferrite rod won't be better 
> than one wound on the usual ceramic rod.
> 
> But on the other hand, a choke wound on a ferrite rod is used as the 
> filament choke in the cathode circuit of almost every triode power amp 
> design. So it must work very well.
> 
> How is this? Is it because the cathode circuit is a low impedance 
> circuit and the plate circuit a high-impedance circuit?
> 
> Also, the type of ferrite used for the bifilar filament chokes that I 
> have seen in most published designs does not seem to be very critical. 
> Is it for the same reason?
> 
> Would a toroid be better than a rod for the filament choke?
> 
> 73
> 
> Angel Vilaseca HB9SLV
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