[AMRadio] RF Chokes

[Brett Gazdzinski]

What kind of choke, the plate choke?
$8.00 to $10.00 is a low price.

B+W made some, just close wound wire on a ceramic insulator, then there
are the pi wound coils, etc.
Something good for the current will be big, and needs to be mounted on 
a big insulator.

I have a couple, they are 3/4 inch by 6 inches long, wound with about #18
wire, close wound, 4.5 inches long.

This would work, you can make your own choke.

B+W is still in business, and I bet they want over $50.00 for one...

Hammond makes the low power chokes, 2.5Mh 5Mh, etc.
They are very nice chokes, I used a few in the receiver I just built,
very nicely made indeed.

Maybe the guy you gave the choke to never used it?


Brett
N2DTS


> 
> 
> A while back, some ham came over, and we got to talking about 
> homebrewing.
> He was building something, and needed an RF choke.  I had a 
> brand new, never
> used, National RF choke, still in the original box.  At the 
> time I never had 
> any plans of building anything.  I have my push-pull, 
> link-coupled 250TH 
> final, and even though it was built in the 50's, it will 
> probably outlive me.
> 
> But, recently I got the urge to build.  I think the 
> conversation here about
> all the homebrewing that's been going on had a heavy hand to 
> spark that
> interest.  I thank y'all for that.
> 
> The plan is to build up a final, using a single tube in the 
> final.  Either a 
> 450TL, or a 304TL.  I'm leaning towards the 450TL, because I've got
> three of them, and a single tube, modulated by a pair interests me.
> 
> I've got the main tuning capacitor (B&W Butterfly 
> w/neutralization caps
> on the back) an HDVL jack-bar, all the plug in coils for 80 
> thru 10, an
> aluminum chassis to mount it on, and most of the necessary associated 
> hardware... except for the RF choke.
> 
> I found a couple on E-bay... but $8.oo to $10.oo?  Are they 
> really that
> expensive, even still today?
> 
> Does anyone have a spare they wouldn't mind parting with?
> 
> 73 = Best Regards,
> -Geoff/W5OMR
> 
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