{"id":42,"date":"2015-02-18T15:13:00","date_gmt":"2015-02-18T13:13:00","guid":{"rendered":"https:\/\/rerunelectronicscom.wordpress.com\/2015\/02\/18\/musical-instrument-tube-preamplifier-buffer-amplifier"},"modified":"2018-11-03T09:59:02","modified_gmt":"2018-11-03T09:59:02","slug":"musical-instrument-tube-preamplifier-buffer-amplifier","status":"publish","type":"post","link":"http:\/\/rerun-electronics.com\/?p=42","title":{"rendered":"Musical Instrument Tube Preamplifier &#038; Buffer Amplifier"},"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\/2015\/02\/front19.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"http:\/\/rerun-electronics.com\/wp-content\/uploads\/2015\/02\/front19.jpg\" alt=\"\" data-id=\"1968\" data-link=\"http:\/\/rerun-electronics.com\/?attachment_id=1968\" class=\"wp-image-1968\" srcset=\"http:\/\/rerun-electronics.com\/wp-content\/uploads\/2015\/02\/front19.jpg 1024w, http:\/\/rerun-electronics.com\/wp-content\/uploads\/2015\/02\/front19-300x200.jpg 300w, http:\/\/rerun-electronics.com\/wp-content\/uploads\/2015\/02\/front19-768x512.jpg 768w\" 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\/2015\/02\/side11.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"http:\/\/rerun-electronics.com\/wp-content\/uploads\/2015\/02\/side11.jpg\" alt=\"\" data-id=\"1970\" data-link=\"http:\/\/rerun-electronics.com\/?attachment_id=1970\" class=\"wp-image-1970\" srcset=\"http:\/\/rerun-electronics.com\/wp-content\/uploads\/2015\/02\/side11.jpg 1024w, http:\/\/rerun-electronics.com\/wp-content\/uploads\/2015\/02\/side11-300x200.jpg 300w, http:\/\/rerun-electronics.com\/wp-content\/uploads\/2015\/02\/side11-768x512.jpg 768w\" 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\/2015\/02\/hinten3.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"http:\/\/rerun-electronics.com\/wp-content\/uploads\/2015\/02\/hinten3.jpg\" alt=\"\" data-id=\"1969\" data-link=\"http:\/\/rerun-electronics.com\/?attachment_id=1969\" class=\"wp-image-1969\" srcset=\"http:\/\/rerun-electronics.com\/wp-content\/uploads\/2015\/02\/hinten3.jpg 1024w, http:\/\/rerun-electronics.com\/wp-content\/uploads\/2015\/02\/hinten3-300x200.jpg 300w, http:\/\/rerun-electronics.com\/wp-content\/uploads\/2015\/02\/hinten3-768x512.jpg 768w\" 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\/2015\/02\/backside.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"http:\/\/rerun-electronics.com\/wp-content\/uploads\/2015\/02\/backside.jpg\" alt=\"\" data-id=\"1967\" data-link=\"http:\/\/rerun-electronics.com\/?attachment_id=1967\" class=\"wp-image-1967 is-layout-flex wp-block-gallery-is-layout-flex\" srcset=\"http:\/\/rerun-electronics.com\/wp-content\/uploads\/2015\/02\/backside.jpg 1024w, http:\/\/rerun-electronics.com\/wp-content\/uploads\/2015\/02\/backside-300x200.jpg 300w, http:\/\/rerun-electronics.com\/wp-content\/uploads\/2015\/02\/backside-768x512.jpg 768w\" 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;\"><i>Built for Simon Goff<\/i><\/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;\">This is one of those deceptively simple devices that make a lot of sense and are eminently practical. &nbsp;Simon initially contacted me to build something to interface the piezo pickup from his violin with the outside world. &nbsp;Ideally, a buffer would be built as close to the pickup as possible to reduce any losses from the very high impedance output. &nbsp;However violins are obviously fragile and it just wouldn&#8217;t suit to have anything that imposing or worse, something that touches the wood of the instrument. &nbsp;Therefore, we decided on having a self-enclosed external device. &nbsp;<\/div>\n<div class=\"separator\" style=\"clear: both; text-align: left;\">&nbsp;<\/div>\n<div class=\"separator\" style=\"clear: both; text-align: left;\">The preamp itself is a high impedance simple ECC82 gain stage followed first by a tilt tone control and volume then a cathode follower for a low impedance output. &nbsp;There are two outputs: one for the main, one for a tuner. &nbsp;The footswitch mutes the main output while the tuner is always &#8220;on&#8221;. &nbsp;The simplicity of the circuit lends itself to pretty much any instrument and would particularly suit a bass guitar. &nbsp;Put it before a big power amp and it makes a clean and inexpensive bass rig. &nbsp;<\/div>\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>Built for Simon Goff &nbsp; This is one of those deceptively simple devices that make a lot of sense and are eminently practical. &nbsp;Simon initially contacted me to build something to interface the piezo pickup from his violin with the outside world. &nbsp;Ideally, a buffer would be built as close to the pickup as possible &hellip; <\/p>\n<p class=\"link-more\"><a href=\"http:\/\/rerun-electronics.com\/?p=42\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Musical Instrument Tube Preamplifier &#038; Buffer Amplifier&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":2025,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"image","meta":{"advgb_blocks_editor_width":"","advgb_blocks_columns_visual_guide":"","jetpack_post_was_ever_published":false,"_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":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[5],"tags":[],"class_list":["post-42","post","type-post","status-publish","format-image","has-post-thumbnail","hentry","category-instrument-amplifiers","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\/2018\/11\/front19\u2022-300x201.jpg","jetpack_publicize_connections":[],"jetpack_featured_media_url":"http:\/\/rerun-electronics.com\/wp-content\/uploads\/2018\/11\/front19\u2022.jpg","coauthors":[],"tax_additional":{"categories":{"linked":["<a href=\"http:\/\/rerun-electronics.com\/?cat=5\" class=\"advgb-post-tax-term\">Instrument Amplifiers<\/a>"],"unlinked":["<span class=\"advgb-post-tax-term\">Instrument Amplifiers<\/span>"]}},"comment_count":"0","relative_dates":{"created":"Posted 11 years ago","modified":"Updated 7 years ago"},"absolute_dates":{"created":"Posted on 2015-02-18","modified":"Updated on 2018-11-03"},"absolute_dates_time":{"created":"Posted on 2015-02-18 15:13","modified":"Updated on 2018-11-03 09:59"},"featured_img_caption":"","series_order":"","jetpack_sharing_enabled":false,"jetpack_shortlink":"https:\/\/wp.me\/papHjQ-G","_links":{"self":[{"href":"http:\/\/rerun-electronics.com\/index.php?rest_route=\/wp\/v2\/posts\/42","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=42"}],"version-history":[{"count":3,"href":"http:\/\/rerun-electronics.com\/index.php?rest_route=\/wp\/v2\/posts\/42\/revisions"}],"predecessor-version":[{"id":1986,"href":"http:\/\/rerun-electronics.com\/index.php?rest_route=\/wp\/v2\/posts\/42\/revisions\/1986"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/rerun-electronics.com\/index.php?rest_route=\/wp\/v2\/media\/2025"}],"wp:attachment":[{"href":"http:\/\/rerun-electronics.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=42"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/rerun-electronics.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=42"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/rerun-electronics.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=42"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}