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Old 14th January 2011, 08:37 PM   #1
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Default For that hard to find 5HY 2 amp choke...

Here's one page of many from the HARBACH ELECTRONICS/PETER W. DAHL AMATEUR RADIO TRANSFORMER DATABASE / catalog.

I chose the "C" pdf because chokes show up quickly. When browsing the pages, just look for how much each weighs, if it's 15lbs or less, it may be of interest.
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Old 14th January 2011, 11:05 PM   #2
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recipe :

.....for my ancient chokes (presumably 9mH, certainly 0E2 Rdc) :


EI72 package
height of package ~30mm
entire window filled with 1,25 enameled wire

air gap ~ 0,5 mm
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Old 15th January 2011, 09:14 AM   #3
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Nice thing about this type of chokes is they can take a huge ripple voltage, so you can use them to build choke-input supplies.

Some of those are "swinging chokes" which purposely go into partial saturation (lowering their inductance) if the current gets high, resulting in a crude form of voltage regulation (especially in class AB or B amps where the current draw swings significantly). As they operate partially in saturation these types can be noisy so for audio I'd recommend to operate them well below their rated current (i.e., not using them in their "swinging" mode).
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