[Boatanchors] Large 4.25 Henry Choke

[Bry Carling]

Guys - the bottom line is this thing will certainly handle a ham gallon 
power supply as part of a choke input filter or as a PI network filter 
and I don't believe it will get hot or disipate 800 watts in such an 
application as some here claim, - not unless you short out your 
RF final tubes to ground anyway! It's not going to get very hot in 
amateur AM, SSB or CW service!

The perfectionist dissection has run its course. Time for the empirical 
radio amateurs to have their go at this now.... grin!

I tested the choke and it is good, so whoever wants it can play with 
it happily.

--------------------------------------------------
On 28 Feb 2011 at 18:16, Bry Carling wrote:

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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