Yes, I have several ferrite core 2.5 mH chokes here, including the
Hammond one you mention. There's a significant difference in high
frequency performance of the pi wound on ceramic form versus the smaller
pi-wound over ferrite and that's one of the things I'm hoping to
illustrate in the article. Hence, I needed a genuine 2.5 mH "National
Radio" style choke.
Jack
K7TV wrote:
Try Antique Electronic Supply (www.tubesandmore.com).
Their 2.5 mH is good for 160 mA, made by Hammond,
core material is ferrite, 3 pi-windings, diameter 0.469", price
$3.95.
Erik K7TV
Another used-to-be-common part is a 2.5 mH RF choke, pi wound on a
ceramic form. After a lengthy search, I found Hammond still makes these,
only to learn that they were discontinued earlier this year. I managed
to get one (at a price of $14) and it's good that I only needed one to
use as a comparison reference for a QEX article I'm working on.
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