![\"\"](\"https:\/\/i0.wp.com\/www.bartola.co.uk\/valves\/wp-content\/uploads\/2018\/01\/EML20AM-valve-1-2.png\")
<\/a>The next step was to produce a nice set of curves to make it easier the process of developing the Spice model:<\/p>\n
The model adjusts very well. Unfortunately there’s no capacitance data on the EML data sheet. I have to say that this is an area where they fall short. These days you would expect a detailed data sheet. That is not the case so far, I hope they improve on this in the future.<\/p>\n The Spice Model works really well. You can download it here: EML20AM spice model<\/a><\/p>\n Still need to undertake the usual THD measurements for various operating points. It looks like it’s best to run it around 300V. My current DHT preamp HT supply will not fit the optimal operating point, but playing in LTSpice, I can implement this one easily with filament bias.<\/p>\n Hope this helps<\/p>\n Ale<\/p>\n <\/p>\n","protected":false},"excerpt":{"rendered":" There is one DHT which attracted me from Emission Labs which is the EML20. If you’re looking for a mid-mu DHT valve these days, this one is the way to go. In order to meet with the two key requirements of linearity and low microphonic noise, EML made a great effort in producing this valve. … Continue reading “EML 20-AM DHT curves and model”<\/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":[6,540,373,1092,1096,1093,1094,1095,1097,1098],"class_list":["post-7083","post","type-post","status-publish","format-standard","hentry","category-valves","tag-dht","tag-dht-driver","tag-dht-spice-model","tag-emission-labs","tag-eml-spice-model","tag-eml20","tag-eml20am","tag-mesh","tag-spice-model","tag-spud-preamp"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p2r2tK-1Qf","jetpack_likes_enabled":true,"jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/7083","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=7083"}],"version-history":[{"count":1,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/7083\/revisions"}],"predecessor-version":[{"id":7087,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/7083\/revisions\/7087"}],"wp:attachment":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/media?parent=7083"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/categories?post=7083"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/tags?post=7083"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}<\/a><\/p>\n**** EML20AM TRIODE Composite DHT *****************************************\n* Created on 01\/21\/2018 12:10 using paint_kit.jar 3.0 \n* www.dmitrynizh.com\/tubeparams_image.htm\n* Plate Curves image file: EML20AM triode.png\n* Data source link: www.bartola.co.uk\/valves\n*\n* Model and curve traced by Ale Moglia\n* (c) Bartola Ltd. UK, London, UK\n* valves@bartola.co.uk\n*\n* Curved traced with eTracer\n*\n* Notes: missing capacitance data, not available in datasheet\n*\n*----------------------------------------------------------------------------------\n.SUBCKT DHT_EML20AM 1 2 3 4 ; P G K1 K2\n+ PARAMS: CCG=1P CGP=1P CCP=1P RFIL=3.33\n+ MU=20.7 KG1=1230 KP=300 KVB=60 VCT=-3.68 EX=1.4 RGI=2000\n* Vp_MAX=600 Ip_MAX=60 Vg_step=2 Vg_start=0 Vg_count=14\n* Rp=4000 Vg_ac=55 P_max=9 Vg_qui=-48 Vp_qui=300\n* X_MIN=75 Y_MIN=51 X_SIZE=509 Y_SIZE=556 FSZ_X=1178 FSZ_Y=705 XYGrid=false\n* showLoadLine=n showIp=y isDHT=y isPP=n isAsymPP=n showDissipLimit=y \n* showIg1=n gridLevel2=n isInputSnapped=n \n* XYProjections=n harmonicPlot=n harmonics=y\n*----------------------------------------------------------------------------------\nRFIL_LEFT 3 31 {RFIL\/4}\nRFIL_RIGHT 4 41 {RFIL\/4}\nRFIL_MIDDLE1 31 34 {RFIL\/4}\nRFIL_MIDDLE2 34 41 {RFIL\/4}\nE11 32 0 VALUE={V(1,31)\/KP*LOG(1+EXP(KP*(1\/MU+V(2,31)\/SQRT(KVB+V(1,31)*V(1,31)))))} \nE12 42 0 VALUE={V(1,41)\/KP*LOG(1+EXP(KP*(1\/MU+V(2,41)\/SQRT(KVB+V(1,41)*V(1,41)))))} \nRE11 32 0 1G \nRE12 42 0 1G \nG11 1 31 VALUE={(PWR(V(32),EX)+PWRS(V(32),EX))\/(2*KG1)} \nG12 1 41 VALUE={(PWR(V(42),EX)+PWRS(V(42),EX))\/(2*KG1)} \nRCP1 1 34 1G \nC1 2 34 {CCG} ; CATHODE-GRID \nC2 2 1 {CGP} ; GRID=PLATE \nC3 1 34 {CCP} ; CATHODE-PLATE \nD3 5 3 DX ; FOR GRID CURRENT \nD4 6 4 DX ; FOR GRID CURRENT \nRG1 2 5 {2*RGI} ; FOR GRID CURRENT \nRG2 2 6 {2*RGI} ; FOR GRID CURRENT \n.MODEL DX D(IS=1N RS=1 CJO=10PF TT=1N) \n.ENDS \n*$<\/pre>\n