{"id":6944,"date":"2017-12-02T17:45:28","date_gmt":"2017-12-02T17:45:28","guid":{"rendered":"http:\/\/www.bartola.co.uk\/valves\/?p=6944"},"modified":"2018-09-04T08:11:58","modified_gmt":"2018-09-04T07:11:58","slug":"2p29l-dht-preamp-final-build","status":"publish","type":"post","link":"https:\/\/www.bartola.co.uk\/valves\/2017\/12\/02\/2p29l-dht-preamp-final-build\/","title":{"rendered":"2P29L DHT Preamp – final build"},"content":{"rendered":"

Finally I managed to build a stable version<\/a> of the 2P29L preamp<\/a>. The wooden modular version inspired on DHTRob designs paid off. Here it is:<\/p>\n

\"\"<\/a><\/p>\n

The result is fantastic. The 2P29L is a superb DHT, quiet and it sounds amazing. The circuit is similar to the original one but with a slightly different operating point due to the valves themselves:<\/p>\n

\"\"<\/a>I’m still running them at 20mA. This time the anode voltage has to be increased to 150V to achieve this. Consistent across the 2 valves used.<\/p>\n

C2 was modified to fit a gift I received from my friend Vyacheslav. Instead of the usual 220nF, I fit a bigger 470nF FT-3 version which improves the LF response.<\/p>\n

The frequency response is very good, as I published before. \u00a0For the curious ones, here are some further pictures of the build:\"\"<\/a><\/p>\n

 <\/p>\n

 <\/p>\n


\n\"\"<\/a>I can’t say more than what I said before. This is a fantastic DHT, it provides a great detailed sound and is quiet. No microphonic noise and the dynamics are great. One of my favourite\u00a0clearly.<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

Finally I managed to build a stable version of the 2P29L preamp. The wooden modular version inspired on DHTRob designs paid off. Here it is: The result is fantastic. The 2P29L is a superb DHT, quiet and it sounds amazing. The circuit is similar to the original one but with a slightly different operating point … Continue reading “2P29L DHT Preamp – final build”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"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":[918,1083,1032,864,888],"class_list":["post-6944","post","type-post","status-publish","format-standard","hentry","category-valves","tag-2p29l","tag-2p29l-dht","tag-2p29l-preamp","tag-bartola-gyrator","tag-gyrator-board"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p2r2tK-1O0","jetpack_likes_enabled":true,"jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/6944","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/comments?post=6944"}],"version-history":[{"count":2,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/6944\/revisions"}],"predecessor-version":[{"id":7571,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/6944\/revisions\/7571"}],"wp:attachment":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/media?parent=6944"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/categories?post=6944"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/tags?post=6944"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}