{"id":34,"date":"2016-03-11T13:39:00","date_gmt":"2016-03-11T13:39:00","guid":{"rendered":"https:\/\/rerunelectronicscom.wordpress.com\/2016\/03\/11\/the-rectifa-power-supply-unit-magnetic-sound-preamplifier"},"modified":"2018-11-13T21:09:01","modified_gmt":"2018-11-13T21:09:01","slug":"the-rectifa-power-supply-unit-magnetic-sound-preamplifier","status":"publish","type":"post","link":"http:\/\/rerun-electronics.com\/?p=34","title":{"rendered":"The Rectifa Power Supply Unit &#038; Magnetic Sound Preamplifier"},"content":{"rendered":"\n<ul class=\"wp-block-gallery columns-3 is-cropped wp-block-gallery-1\"><li class=\"blocks-gallery-item\"><figure><a href=\"http:\/\/rerun-electronics.com\/wp-content\/uploads\/2016\/03\/front27-copy\u2022.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"972\" height=\"1313\" src=\"http:\/\/rerun-electronics.com\/wp-content\/uploads\/2016\/03\/front27-copy\u2022.jpg\" alt=\"\" data-id=\"1891\" data-link=\"http:\/\/rerun-electronics.com\/?attachment_id=1891\" class=\"wp-image-1891\" srcset=\"http:\/\/rerun-electronics.com\/wp-content\/uploads\/2016\/03\/front27-copy\u2022.jpg 972w, http:\/\/rerun-electronics.com\/wp-content\/uploads\/2016\/03\/front27-copy\u2022-222x300.jpg 222w, http:\/\/rerun-electronics.com\/wp-content\/uploads\/2016\/03\/front27-copy\u2022-768x1037.jpg 768w, http:\/\/rerun-electronics.com\/wp-content\/uploads\/2016\/03\/front27-copy\u2022-758x1024.jpg 758w\" sizes=\"auto, (max-width: 706px) 89vw, (max-width: 767px) 82vw, 740px\" \/><\/a><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><a href=\"http:\/\/rerun-electronics.com\/wp-content\/uploads\/2018\/11\/side17-e1541194327856.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1080\" height=\"1404\" src=\"http:\/\/rerun-electronics.com\/wp-content\/uploads\/2018\/11\/side17-e1541194327856.jpg\" alt=\"\" data-id=\"1936\" data-link=\"http:\/\/rerun-electronics.com\/?attachment_id=1936\" class=\"wp-image-1936\" srcset=\"http:\/\/rerun-electronics.com\/wp-content\/uploads\/2018\/11\/side17-e1541194327856.jpg 1080w, http:\/\/rerun-electronics.com\/wp-content\/uploads\/2018\/11\/side17-e1541194327856-231x300.jpg 231w, http:\/\/rerun-electronics.com\/wp-content\/uploads\/2018\/11\/side17-e1541194327856-768x998.jpg 768w, http:\/\/rerun-electronics.com\/wp-content\/uploads\/2018\/11\/side17-e1541194327856-788x1024.jpg 788w\" sizes=\"auto, (max-width: 706px) 89vw, (max-width: 767px) 82vw, 740px\" \/><\/a><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><a href=\"http:\/\/rerun-electronics.com\/wp-content\/uploads\/2018\/11\/inside4.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"790\" src=\"http:\/\/rerun-electronics.com\/wp-content\/uploads\/2018\/11\/inside4.jpg\" alt=\"\" data-id=\"2000\" data-link=\"http:\/\/rerun-electronics.com\/?attachment_id=2000\" class=\"wp-image-2000 is-layout-flex wp-block-gallery-is-layout-flex\" srcset=\"http:\/\/rerun-electronics.com\/wp-content\/uploads\/2018\/11\/inside4.jpg 1200w, http:\/\/rerun-electronics.com\/wp-content\/uploads\/2018\/11\/inside4-300x198.jpg 300w, http:\/\/rerun-electronics.com\/wp-content\/uploads\/2018\/11\/inside4-768x506.jpg 768w, http:\/\/rerun-electronics.com\/wp-content\/uploads\/2018\/11\/inside4-1024x674.jpg 1024w\" sizes=\"auto, (max-width: 706px) 89vw, (max-width: 767px) 82vw, 740px\" \/><\/a><\/figure><\/li><\/ul>\n\n\n<div class=\"separator\" style=\"clear: both; text-align: left;\">\n<p><i>Built for Doug Henderson of <a href=\"http:\/\/micro-moose-berlin.blogspot.de\/\" target=\"_blank\" rel=\"noopener\">micro-moose-berlin<\/a><\/i><\/p>\n<\/div>\n<div class=\"separator\" style=\"clear: both; text-align: left;\">This project came out of the fact that Doug had a full set of the General Precision Laboratories preamplifiers as well as the enclosure to go with them. &nbsp;These preamplifiers were designed to amplify the signals from cinema projectors and as such had an enormous amount of gain as well as noise&#8211; simply too much for a typical studio environment.<\/div>\n<div class=\"separator\" style=\"clear: both; text-align: left;\"><i>&nbsp;<\/i><\/div>\n<div class=\"separator\" style=\"clear: both; text-align: left;\">Doug&#8217;s idea was to modify the circuit to allow for line level signals thereby using the wonderful sounding UTC transformers but having much less overall gain. &nbsp;Because it would be a shame to not have some flexibility in the preamps, I used a switch in the level pot to activate another gain stage which means dynamic and ribbon mics can also be used.<\/div>\n<div class=\"separator\" style=\"clear: both; text-align: left;\"><i>&nbsp;<\/i><\/div>\n<div class=\"separator\" style=\"clear: both; text-align: left;\">\n<p>The power supply, besides having the correct looks to match the preamps, also utilizes an EZ81 for the high voltage supply and a series DC supply for the heaters. &nbsp;The two meters on the front indicate the voltage (19 VDC) and current (1A).<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Built for Doug Henderson of micro-moose-berlin This project came out of the fact that Doug had a full set of the General Precision Laboratories preamplifiers as well as the enclosure to go with them. &nbsp;These preamplifiers were designed to amplify the signals from cinema projectors and as such had an enormous amount of gain as &hellip; <\/p>\n<p class=\"link-more\"><a href=\"http:\/\/rerun-electronics.com\/?p=34\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;The Rectifa Power Supply Unit &#038; Magnetic Sound Preamplifier&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":1891,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"image","meta":{"advgb_blocks_editor_width":"","advgb_blocks_columns_visual_guide":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[7],"tags":[],"class_list":["post-34","post","type-post","status-publish","format-image","has-post-thumbnail","hentry","category-microphone-preampflifiers","post_format-post-format-image"],"author_meta":{"display_name":"rerun","author_link":"http:\/\/rerun-electronics.com\/author\/rerun"},"featured_img":"http:\/\/rerun-electronics.com\/wp-content\/uploads\/2016\/03\/front27-copy\u2022-222x300.jpg","jetpack_publicize_connections":[],"jetpack_featured_media_url":"http:\/\/rerun-electronics.com\/wp-content\/uploads\/2016\/03\/front27-copy\u2022.jpg","coauthors":[],"tax_additional":{"categories":{"linked":["<a href=\"http:\/\/rerun-electronics.com\/?cat=7\" class=\"advgb-post-tax-term\">Microphone Preampflifiers<\/a>"],"unlinked":["<span class=\"advgb-post-tax-term\">Microphone Preampflifiers<\/span>"]}},"comment_count":"0","relative_dates":{"created":"Posted 10 years ago","modified":"Updated 8 years ago"},"absolute_dates":{"created":"Posted on 2016-03-11","modified":"Updated on 2018-11-13"},"absolute_dates_time":{"created":"Posted on 2016-03-11 13:39","modified":"Updated on 2018-11-13 21:09"},"featured_img_caption":"","series_order":"","jetpack_sharing_enabled":false,"jetpack_shortlink":"https:\/\/wp.me\/papHjQ-y","_links":{"self":[{"href":"http:\/\/rerun-electronics.com\/index.php?rest_route=\/wp\/v2\/posts\/34","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/rerun-electronics.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/rerun-electronics.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/rerun-electronics.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/rerun-electronics.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=34"}],"version-history":[{"count":4,"href":"http:\/\/rerun-electronics.com\/index.php?rest_route=\/wp\/v2\/posts\/34\/revisions"}],"predecessor-version":[{"id":2458,"href":"http:\/\/rerun-electronics.com\/index.php?rest_route=\/wp\/v2\/posts\/34\/revisions\/2458"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/rerun-electronics.com\/index.php?rest_route=\/wp\/v2\/media\/1891"}],"wp:attachment":[{"href":"http:\/\/rerun-electronics.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=34"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/rerun-electronics.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=34"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/rerun-electronics.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=34"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}