{"id":7353,"date":"2018-04-02T14:37:47","date_gmt":"2018-04-02T13:37:47","guid":{"rendered":"http:\/\/www.bartola.co.uk\/valves\/?p=7353"},"modified":"2018-04-02T14:39:33","modified_gmt":"2018-04-02T13:39:33","slug":"6%d1%8d6%d0%bf-%d0%b4%d1%80-6e6p-dr-preamp-driver","status":"publish","type":"post","link":"https:\/\/www.bartola.co.uk\/valves\/2018\/04\/02\/6%d1%8d6%d0%bf-%d0%b4%d1%80-6e6p-dr-preamp-driver\/","title":{"rendered":"6\u042d6\u041f-\u0414\u0420 (6e6p-dr) preamp \/ driver"},"content":{"rendered":"

With a quick mod on one of my active preamps, I managed to implement very quickly the\u00a06\u042d6\u041f-\u0414\u0420 (6e6p-dr) driver in my system. Here is how the circuit looks like:<\/p>\n

\"\"<\/a>
6\u042d6\u041f-\u0414\u0420 (6e6p-dr) preamp \/ driver<\/figcaption><\/figure>\n

The bias point is good enough for driving a 4P1L PSE stage. You could push it up to 200V, but not really needed. I’ve discussed this valve and its performance in my previous post<\/a>.<\/p>\n

Regarding the filament circuit, I have at hand a 15VDC raw filament supply for my DHTs. I put the filaments in series and used my own LDO LV regulator which has a slow start feature and its very low noise. The cathode-heater insulation of the 6e5p proved to be poor so this valve isn’t the best for AC heating. Just as a precaution measure, the regulator would prevent any supply noise to filter into the circuit.<\/p>\n

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

The result is fantastic. I thought the gain could be too much, but is perfectly fine for the 4P1L PSE output stage. I’d implement this driver instead on what I proposed earlier in this post.<\/a><\/p>\n

The harmonic profile is really good, see below:<\/p>\n

\"\"<\/a>
6e6p-dr THD @ 20Vrms<\/figcaption><\/figure>\n

My first impressions are great. I always loved the sound of this IHP. It’s one of my favourite drivers as I said before and blends really well with the 4P1L PSE.<\/p>\n

You will probably don’t want any more gain. This is good enough and will drive the 4P1L PSE at maximum power easily. If you implement a 3-valve version of the PSE design, you’d enjoy the extra power. I would recommend adding a source follower in such a case and implement fixed bias.<\/p>\n

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

With a quick mod on one of my active preamps, I managed to implement very quickly the\u00a06\u042d6\u041f-\u0414\u0420 (6e6p-dr) driver in my system. Here is how the circuit looks like:<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_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},"jetpack_post_was_ever_published":false},"categories":[835,911,156,158],"tags":[782,976,29,606,1149,1150,605,864,875],"class_list":["post-7353","post","type-post","status-publish","format-standard","hentry","category-4p1l-pse-amp","category-gyrator-pcb","category-pre-amplifier-valves","category-se-designs","tag-4p1l","tag-4p1l-pse-amplifier","tag-6e5p","tag-6e6p","tag-6e6p-driver","tag-6e6p-preamplifier","tag-6e6p-dr","tag-bartola-gyrator","tag-gyrator-pcb"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p2r2tK-1UB","jetpack_likes_enabled":true,"jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/7353","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=7353"}],"version-history":[{"count":2,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/7353\/revisions"}],"predecessor-version":[{"id":7359,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/7353\/revisions\/7359"}],"wp:attachment":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/media?parent=7353"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/categories?post=7353"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/tags?post=7353"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}