{"id":3528,"date":"2018-12-19T01:57:00","date_gmt":"2018-12-18T14:57:00","guid":{"rendered":"https:\/\/www.homebrewradio.us\/blog\/2018\/12\/19\/all-i-want-for-christmas-is-an-ht-37-l25-choke-9-henries-at-135-ma\/"},"modified":"2025-07-21T15:38:27","modified_gmt":"2025-07-21T05:38:27","slug":"all-i-want-for-christmas-is-an-ht-37-l25-choke-9-henries-at-135-ma","status":"publish","type":"post","link":"https:\/\/www.homebrewradio.us\/blog\/2018\/12\/19\/all-i-want-for-christmas-is-an-ht-37-l25-choke-9-henries-at-135-ma\/","title":{"rendered":"All I want for Christmas is… an HT-37 L25 Choke– 9 Henries at 135 ma"},"content":{"rendered":"
<\/a><\/div>\n


<\/b> Following my own advice to prepare for Straight Key Night, I tried to fire up my venerable Hallicrafters HT-37 transmitter. It didn’t work. I quickly determined that none of the oscillators were working, so my troubleshooting focused on the power supply. Sure enough, the choke in the low voltage power supply is open. That’s bad. <\/b>

<\/b> I briefly considered giving up on this old rig. I don’t really like working with tubes anymore. And this thing is very heavy — a real beast. DX-100-like in its heaviness. It can be hazardous to your health just moving this thing around. Opening up the case is not easy. And there are nasty voltages in there…. <\/b>

<\/b> But I have had this transmitter since 1973 or 1974. I have fixed it many times, in several countries. I got it from a member of the Crystal Radio Club when I was a kid. There are parts given to me by Pericles, HI8P in the Dominican Republic. I used it to transmit through Russian satellites. That transmitter is like an old friend. I just can’t give up on it. <\/b>

<\/b> So I need to replace or repair the choke. Is there anyone out there who has a junker out in the garage or some other source of L25? Or does anyone know of a business that could rewind the choke. Please let me know. I have decided to leave the rig on the bench until I get this thing fixed (it is too heavy to move multiple times!) <\/b>

<\/b> It it Hallicrafters Part Number 056-300259. L25 — 9 Henries at 135 ma. Help! <\/b><\/p>\n","protected":false},"excerpt":{"rendered":"

Following my own advice to prepare for Straight Key Night, I tried to fire up my venerable Hallicrafters HT-37 transmitter. It didn’t work. I quickly determined that none of the oscillators were working, so my troubleshooting focused on the power supply. Sure enough, the choke in the low voltage power supply is open. That’s bad. … Continue reading “All I want for Christmas is… an HT-37 L25 Choke– 9 Henries at 135 ma”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":3529,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[59,100,38,25],"tags":[],"class_list":["post-3528","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hallicrafters","category-old-radio","category-parts-suppliers","category-troubleshooting"],"_links":{"self":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/3528","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/comments?post=3528"}],"version-history":[{"count":1,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/3528\/revisions"}],"predecessor-version":[{"id":3530,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/3528\/revisions\/3530"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media\/3529"}],"wp:attachment":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media?parent=3528"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/categories?post=3528"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/tags?post=3528"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}