{"id":9854,"date":"2016-11-01T08:30:47","date_gmt":"2016-11-01T15:30:47","guid":{"rendered":"http:\/\/crimeandtheforcesofevil.com\/blog\/?p=9854"},"modified":"2016-10-31T22:09:08","modified_gmt":"2016-11-01T05:09:08","slug":"mod-report-oktava-mk-012mc-012-microphone","status":"publish","type":"post","link":"https:\/\/crimeandtheforcesofevil.com\/blog\/2016\/11\/01\/mod-report-oktava-mk-012mc-012-microphone\/","title":{"rendered":"mod report: oktava mk-012\/mc-012 microphone"},"content":{"rendered":"<p>Oktava has some great microphone designs. But the quality of the components can be pretty random, particularly in the used market, since a nontrival number of those were made in the early post-Soviet era. My two 012s sounded pretty different &#8211; one in particular rather unpleasantly harsh &#8211; so I implemented <a target=\"_blank\" href=\"http:\/\/www.recordingmag.com\/resources\/resourceDetail\/315.html\">Recording Magazine&#8217;s recommended component upgrade<\/a><small><sup>*<\/sup><\/small> on the harsh one, which we&#8217;ll call Nr. 1.<\/p>\n<p>Nr. 1 may have been modded a bit before. It&#8217;s certainly been <em>opened<\/em> before; one of the three screws was stripped and useless, the other was jammed badly. I had to drill both out, so I&#8217;m hoping I can order replacements. The third was fine.<\/p>\n<p>As soon as I had the microphone open, I saw what <i>Recording<\/i> meant by random components. The key transistor was a make so old that it had a metal shield ground cap, and separate lead to that cap, something I haven&#8217;t seen in gear made after about, I don&#8217;t even know, 1978? I also saw what they meant by &#8220;fragile circuit board,&#8221; because wow, you could lift these circuit board traces with an overly-aggressive hair dryer. Take care!<\/p>\n<p><center><img decoding=\"async\" src=\"http:\/\/solarbird.net\/Livejournal\/2016-11\/transistor-3bf7.jpg\"><br \/><i>Comrade!<\/i><\/center><\/p>\n<p>Still, it was mostly a matter of being methodical and not rushing things, and in good time, I had the key components upgraded, with no surprises other than the transistor&#8217;s extra lead.<\/p>\n<p>These are three unmodified before\/after snippets in one recording &#8211; recorded under identical conditions other than the internal microphone electronics &#8211; of Oktava mk-012\/mc-012 nr. 1 in my studio. Even on laptop speakers, I can hear the harshness, particularly in the first sample. In all cases, it&#8217;s pre-modification first, then post-modification after:<\/p>\n<p><iframe loading=\"lazy\" width=\"100%\" height=\"450\" scrolling=\"no\" frameborder=\"no\" src=\"https:\/\/w.soundcloud.com\/player\/?url=https%3A\/\/api.soundcloud.com\/tracks\/290758011&amp;auto_play=false&amp;hide_related=false&amp;show_comments=true&amp;show_user=true&amp;show_reposts=false&amp;visual=true\"><\/iframe><\/p>\n<p>Oktava MC-012 nr. 2 sounded very different to nr. 1, before; opening it, I could see that the components used were of a significantly more modern variety. It may well have been made later, which would be part of that. Now, the two microphones sound much more like each other, indicating that nr. 1 really was meaningfully different in component quality.<\/p>\n<p>Here is a recorded comparison of nr. 2 (still factory) and nr. 1 (upgraded). These recordings were made simultaneously, with the two microphones right next to each other. The differences are much subtler, but I think the upgraded nr. 1 has a bit more presence &#8211; or maybe sense of stage &#8211; than the factory nr. 2. Despite being mono recordings, it&#8217;s almost like there&#8217;s a slightly better stereo image in the modified nr. 1&#8230; but give a listen and hear for yourself, see what you think.<\/p>\n<p>You&#8217;ll <em>definitely<\/em> need headphones to have any chance of hearing anything interesting here. Factory nr. 2 comes first in all cases:<\/p>\n<p><iframe loading=\"lazy\" width=\"100%\" height=\"450\" scrolling=\"no\" frameborder=\"no\" src=\"https:\/\/w.soundcloud.com\/player\/?url=https%3A\/\/api.soundcloud.com\/tracks\/290758295&amp;auto_play=false&amp;hide_related=false&amp;show_comments=true&amp;show_user=true&amp;show_reposts=false&amp;visual=true\"><\/iframe><\/p>\n<p>So, all in all, <Em>very<\/em> glad I did this to nr. 1; pretty sure I&#8217;m going to go ahead and do it with nr. 2 as well, though I expect a much less dramatic change.<\/p>\n<p>The only thing I&#8217;m thinking about now is &#8211; there&#8217;s a bank of capacitors in back. They&#8217;re good ones &#8211; Philips, not generic, which have a good durability and spec-compliance record. (I don&#8217;t know whether they&#8217;re original; some Oktava 012s shipped with quality caps already in place, and their track record has improved with time.) So I shouldn&#8217;t need to upgrade them &#8211; and the article at Recording Magazine says not to bother if you already have &#8220;improved&#8221; capacitors.<\/p>\n<p>But I don&#8217;t know how old these are, and electrolytics have a lifespan. That&#8217;s measured both in calendar time (years), and in use &#8211; tho&#8217; the latter is in tens of thousands of hours, and these mics are certainly nowhere near that.<\/p>\n<p>The small downside is time spent, the large downside is the possibility of circuit board damage, which wow I don&#8217;t want. The <em>upsides<\/em> would be 1. possible sound improvement if they <Em>are<\/eM> aging already, and 2. Never having to think about it again, in practical terms.<\/p>\n<p>So I dunno. Get it out of the way, or leave sleeping caps lie? Hm.<br \/>\n&nbsp;<br \/>\n&nbsp;<\/p>\n<hr>\n<p>*: errata for the linked article: Capacitor &#8220;C6&#8221; in the parts list is actually capacitor C1; there is no &#8220;C6&#8221; in the build description or circuit diagramme; I assume this is a typo. <\/p>\n<p>Also, some of the items in their parts list are no longer made, but they have exact replacements. R1\/R2 exact replacement part number as per my October 2016 Digi-Key invoice: MOX200J-1000ME-ND. Capacitor C1 (listed as &#8220;C6&#8221; in parts list, see previous paragraph) current part number: 445-4737-ND. Capacitor C2 current part number: 399-1418-ND. Capacitors C3 and C4: 4073PHCT-ND. Capacitor C5: 4047PHCT-ND. Mostly, the substitutions are lead-free versions replacing earlier versions with lead.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Oktava has some great microphone designs. But the quality of the components can be pretty random, particularly in the used market, since a nontrival number of those were made in the early post-Soviet era. My two 012s sounded pretty different &#8211; one in particular rather unpleasantly harsh &#8211; so I implemented Recording Magazine&#8217;s recommended component [&#038;hellip<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,11],"tags":[],"class_list":["post-9854","post","type-post","status-publish","format-standard","hentry","category-diy","category-recording-gear"],"_links":{"self":[{"href":"https:\/\/crimeandtheforcesofevil.com\/blog\/wp-json\/wp\/v2\/posts\/9854","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/crimeandtheforcesofevil.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/crimeandtheforcesofevil.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/crimeandtheforcesofevil.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/crimeandtheforcesofevil.com\/blog\/wp-json\/wp\/v2\/comments?post=9854"}],"version-history":[{"count":11,"href":"https:\/\/crimeandtheforcesofevil.com\/blog\/wp-json\/wp\/v2\/posts\/9854\/revisions"}],"predecessor-version":[{"id":9869,"href":"https:\/\/crimeandtheforcesofevil.com\/blog\/wp-json\/wp\/v2\/posts\/9854\/revisions\/9869"}],"wp:attachment":[{"href":"https:\/\/crimeandtheforcesofevil.com\/blog\/wp-json\/wp\/v2\/media?parent=9854"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/crimeandtheforcesofevil.com\/blog\/wp-json\/wp\/v2\/categories?post=9854"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/crimeandtheforcesofevil.com\/blog\/wp-json\/wp\/v2\/tags?post=9854"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}