{"id":6218,"date":"2017-02-05T17:50:27","date_gmt":"2017-02-05T17:50:27","guid":{"rendered":"http:\/\/www.bartola.co.uk\/valves\/?p=6218"},"modified":"2017-02-05T17:52:27","modified_gmt":"2017-02-05T17:52:27","slug":"4p1l-pse-amp-finished","status":"publish","type":"post","link":"https:\/\/www.bartola.co.uk\/valves\/2017\/02\/05\/4p1l-pse-amp-finished\/","title":{"rendered":"4P1L PSE Amp Finished!"},"content":{"rendered":"

I’ve been travelling a lot lately so haven’t had the chance to update on this project. A couple of weeks ago I finished the 4P1L PSE Amp:<\/p>\n

<\/a>
4P1L PSE Amp<\/figcaption><\/figure>\n

The amp is outstanding, just like previous incarnations and tests I have conducted over the years.  The level of detail and tone is unique. This is what I always loved from the 4P1L. I’m running it very hot (70mA per pair) and the output transformer is Amorphous Core 3K2 (more detail to be shared soon). It’s a simple stage with filament bias, so no cathode capacitor. The filaments are wired in series to reduce the heat dissipation. Despite this adds a bit more on the output impedance, the bass is powerful. I’m very surprised with the bass, but the level of treble is amazing. It goes over 40-50kHz, I will still need to undertake the classic measurements but so far is great!<\/p>\n

It’s absolutely dead quiet. No traces of hum. <\/p>\n

Some more pictures below:<\/p>\n

\"\"<\/a>
Glowing 4P1L and filament resistor stack!<\/figcaption><\/figure>\n

And the full system below:<\/p>\n

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

I’ve been travelling a lot lately so haven’t had the chance to update on this project. A couple of weeks ago I finished the 4P1L PSE Amp: The amp is outstanding, just like previous incarnations and tests I have conducted over the years.  The level of detail and tone is unique. This is what I … Continue reading “4P1L PSE Amp Finished!”<\/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":true,"_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":[835,12],"tags":[782,216,976,287,78],"class_list":["post-6218","post","type-post","status-publish","format-standard","hentry","category-4p1l-pse-amp","category-dht-valves","tag-4p1l","tag-4p1l-pse","tag-4p1l-pse-amplifier","tag-filament-bias","tag-rod-coleman-regulator"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p2r2tK-1Ci","jetpack_likes_enabled":true,"jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/6218","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=6218"}],"version-history":[{"count":3,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/6218\/revisions"}],"predecessor-version":[{"id":6224,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/6218\/revisions\/6224"}],"wp:attachment":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/media?parent=6218"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/categories?post=6218"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/tags?post=6218"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}