[Boatanchors] Large 4.25 Henry Choke

[J. Forster]

No. 1.445 A means roughly 100 W dissipation and a roughly 60 VDC drop
across the choke.

The DC rating of a choke matters for several reasons:
  The heating effect of the I^2R losses
  The saturation flux density.

And, IMO, GE makes well engineered, carefully rated equipment.

-John

===================


> The label is a little hard to read.  At first glance it looked like 445
> amps,
> but I knew that wasn't rght.  I just couldn't spot a DOT -  "."
> anywhere on the faded label.
>
> Now, I think I might see a faint "1" ahead of the 445A which would
> make more sense... That is to say 1.445 Amps... Seem reasonable?
> What a funny rating for them to use and be so specific. But then, it is
> G.E.
> (grin!)
>
> Bry, AF4K
>
>
> On 28 Feb 2011 at 16:00, George Babits wrote:
>
>> At the risk of receiving some scathing comments I have to say that
>> the
>> purpose of a power supply choke is to smooth rectified DC, not
>> generate or
>> dissipate power.  Judging from the size of this choke it is probably
>> .45
>> amps.  The resistance is the DC resistance so you have some idea of
>> what the
>> voltage drop across the choke will be when you design your power
>> supply.
>> 73,
>> George
>> W7HDL
>>
>>
>> ----- Original Message -----
>> From: "Lewis C. Emerson" <lemerson at juno.com>
>> To: <jfor at quik.com>
>> Cc: <boatanchors at puck.nether.net>; <armyradios at yahoogroups.com>
>> Sent: Monday, February 28, 2011 3:51 PM
>> Subject: Re: [Boatanchors] FS: Large 4.25 Henry Choke
>>
>>
>> > John - If its 0.45 A doesn't that mean it's an 8 watt unit?
>> Mighty big
>> > for just 8 watts.   Must be lotsa iron in there. - Doc, W4ITJ
>> >
>> > ---------- Original Message ----------
>> > From: "J. Forster" <jfor at quik.com>
>> > To: bcarling at cfl.rr.com
>> > Cc: boatanchors at puck.nether.net, armyradios at yahoogroups.com
>> > Subject: Re: [Boatanchors] FS:  Large 4.25 Henry Choke
>> > Date: Mon, 28 Feb 2011 12:10:15 -0800 (PST)
>> >
>> > I don't think so.
>> >
>> > Power = I^2 * R
>> >
>> > = 4.45 ^2 * 39 = 800 W
>> >
>> > Maybe, 0.45 A
>> >
>> > -John
>> >
>> > =====================
>> >
>> >
>> >> FOR SALE: General Electric ChokeType 7471984
>> >>
>> >> 4.25 H at 39 ohms resistance. Current rating appears to read
>> >> 4.45A but not sure.  Made in Schenectady, NY
>> >> Dimensions: 5"  X 3-5/8"  X 4-3/8" tall.
>> >> Painted gray, potted, and as ceramic screw terminals with brass
>> >> nuts on the top of one end.
>> >> Mounts via four screw #10 holes in base.
>> >>
>> >> QTY 1 available for $15.00 plus shipping.
>> >>
>> >> 73 de AF4K, Bry Carling
>> >> _______________________________________________
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>> >>
>> >
>> >
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