{"id":8518,"date":"2020-06-10T18:39:57","date_gmt":"2020-06-10T17:39:57","guid":{"rendered":"http:\/\/www.bartola.co.uk\/valves\/?p=8518"},"modified":"2020-06-11T11:37:23","modified_gmt":"2020-06-11T10:37:23","slug":"d3a-spice-model-pentode-triode","status":"publish","type":"post","link":"https:\/\/www.bartola.co.uk\/valves\/2020\/06\/10\/d3a-spice-model-pentode-triode\/","title":{"rendered":"D3a Spice Model (Pentode & Triode)"},"content":{"rendered":"

My latest 300B amplifier brought me again closer to the D3a. I have to say it’s an exceptional driver for this amp as well as it can perform in a phono stage at same excellent level.<\/p>\n

I took the opportunity to trace again one Siemens D3a<\/a> NOS boxed as “POS 1.176 Q 31-X 601”. This one was handpicked as it measured at 102% (31mA) in triode mode with a Gm of 39mS.<\/p>\n

I wanted to develop a pentode model for phono experiments so put this lovely valve back in the eTracer<\/a> and used the Extract Model tool from Derk Reefman<\/a> to develop the model below.<\/p>\n

<\/p>\n

\"\"<\/a>
D3a in triode mode<\/figcaption><\/figure>\n

You can see current saturation effects clearly on the pentode traces when approaching to 0V, that is to say below 0.5V:<\/p>\n

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

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

 <\/p>\n

Here is the result after a few tweaks:<\/p>\n

\"D3a <\/a>
D3a Pentode @ Vs=100V <\/div> <\/div> <\/div>
\"D3a <\/a>
D3a Pentode @ Vs=150V <\/div> <\/div> <\/div> <\/div>
\"D3a <\/a>
D3a Triode <\/div> <\/div> <\/div> <\/div> <\/div>\n

You can see the slight divergence of the model due to the current saturation experienced at very low grid voltages<\/p>\n

Here are the 2 models and would be great to have your feedback after using them. You can download the files from here:\u00a0D3a-Pentode-100V<\/a> and here:D3a-Triode<\/a>.<\/p>\n

Pentode Model:<\/p>\n

****************************************************\n\n.SUBCKT D3a-Pentode-100V 1 2 3 4 ; A G2 G1 C;\n\n* \u00a0 \u00a0 \u00a0Extract V3.000\n\n* Model created: 10-Jun-2020\n\n*\n\n* Curves traced and model developed by Ale Moglia\n\n* (c) 2020 Bartola Valves\n\n* www.bartola.co.uk\/valves email: valves@bartola.co.uk\n\n*\n\n*\n\nX1 1 2 3 4 PenthodeDE \u00a0MU= 77.9 EX=1.433 kG1= \u00a025.7 KP= 587.2 kVB = \u00a02940.0 kG2= \u00a0106.5\n\n+ Ookg1mOokG2=.29E-01 Aokg1=.13E-04 alkg1palskg2=.29E-01 be= \u00a0.049 als= \u00a02.57 RGI=2000\n\n+ CCG1=6.8P \u00a0CCG2 = 0.0p CPG1 = 0.04p \u00a0CG1G2 = 9.5p CCP=0.05P \u00a0;\n\n.ENDS\n\n\n\n\n****************************************************\n\n.SUBCKT PenthodeDE 1 2 3 4; A G2 G1 C\n\n*\n\n* NOTE: LOG(x) is base e LOG or natural logarithm.\n\n* For some Spice versions, e.g. MicroCap, this has to be changed to LN(x).\n\n*\n\nRE1 \u00a07 0 \u00a01MEG \u00a0 \u00a0; DUMMY SO NODE 7 HAS 2 CONNECTIONS\n\nE1 7 0 VALUE=\n\n+{V(2,4)\/KP*LOG(1+EXP(KP*(1\/MU+V(3,4)\/SQRT(KVB+V(2,4)*V(2,4)))))}\n\nE2 \u00a0 8 0 VALUE = {Ookg1mOokG2 + Aokg1*V(1,4) - alkg1palskg2*Exp(-be*V(1,4)*SQRT(be*V(1,4)))}\n\nG1 \u00a0 1 4 \u00a0VALUE = {0.5*(PWR(V(7),EX)+PWRS(V(7),EX))*V(8)}\n\nG2 \u00a0 2 4 VALUE = {0.5*(PWR(V(7),EX)+PWRS(V(7),EX))\/KG2 *(1+als*Exp(-be*V(1,4) * SQRT(be*V(1,4))))}\n\nRCP \u00a01 4 \u00a01G \u00a0 \u00a0 \u00a0; FOR CONVERGENCE A \u00a0- C\n\nC1 \u00a0 3 4 \u00a0{CCG1} \u00a0 ; CATHODE-GRID 1 C \u00a0- G1\n\nC4 \u00a0 2 4 \u00a0{CCG2} \u00a0 ; CATHODE-GRID 2 C \u00a0- G2\n\nC5 \u00a0 2 3 \u00a0{CG1G2} \u00a0 ; GRID 1 -GRID 2 G1 \u00a0- G2\n\nC2 \u00a0 1 3 \u00a0{CPG1} \u00a0; GRID 1-PLATE G1 - A\n\nC3 \u00a0 1 4 \u00a0{CCP} \u00a0 ; CATHODE-PLATE A \u00a0- C\n\nR1 \u00a0 3 5 \u00a0{RGI} \u00a0 ; FOR GRID CURRENT G1 - 5\n\nD3 \u00a0 5 4 \u00a0DX \u00a0 \u00a0 \u00a0; FOR GRID CURRENT 5 \u00a0- C\n\n.MODEL DX D(IS=1N RS=1 CJO=10PF TT=1N)\n\n.ENDS PenthodeDE<\/pre>\n
Triode Model:<\/div>\n
<\/div>\n
\n
****************************************************\n\n.SUBCKT D3a-Triode 1 2 3; A G C;\n\n* Extract V3.000\n\n* Model created: 10-Jun-2020\n\n*\n\n*\n\n* Curves traced and model developed by Ale Moglia\n\n* (c) 2020 Bartola Valves\n\n* www.bartola.co.uk\/valves email: valves@bartola.co.uk\n\n*\n\n*\n\nX1 1 2 3 TriodeK MU= 77.92 EX=1.515 KG1= 25.7 KP= 587.2 KVB= 2940. RGI=2000\n\n+ CCG=6.7P CGP=3.3P CCP=1.0P ;\n\n.ENDS\n\n****************************************************\n.SUBCKT TriodeK 1 2 3; A G C\n*\n* NOTE: LOG(x) is base e LOG or natural logarithm.\n* For some Spice versions, e.g. MicroCap, this has to be changed to LN(x).\n*\nE1 7 0 VALUE=\n+{V(1,3)\/KP*LOG(1+EXP(KP*(1\/MU+V(2,3)\/SQRT(KVB+V(1,3)*V(1,3)))))}\nRE1 7 0 1G\nG1 1 3 VALUE={0.5*(PWR(V(7),EX)+PWRS(V(7),EX))\/KG1}\nRCP 1 3 1G ; TO AVOID FLOATING NODES IN MU-FOLLOWER\nC1 2 3 {CCG} ; CATHODE-GRID\nC2 2 1 {CGP} ; GRID-PLATE\nC3 1 3 {CCP} ; CATHODE-PLATE\nD3 5 3 DX ; FOR GRID CURRENT\nR1 2 5 {RGI} ; FOR GRID CURRENT\n.MODEL DX D(IS=1N RS=1 CJO=10PF TT=1N)\n.ENDS TriodeK<\/pre>\n<\/div>\n
 <\/p>\n
 <\/p>\n","protected":false},"excerpt":{"rendered":"
My latest 300B amplifier brought me again closer to the D3a. I have to say it’s an exceptional driver for this amp as well as it can perform in a phono stage at same excellent level. I took the opportunity to trace again one Siemens D3a NOS boxed as “POS 1.176 Q 31-X 601”. This … Continue reading “D3a Spice Model (Pentode & Triode)”<\/span><\/a><\/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":[530,153,5],"tags":[294,1353,1350,297,1349,1352,1351],"class_list":["post-8518","post","type-post","status-publish","format-standard","hentry","category-components","category-driver","category-valves","tag-d3a","tag-d3a-curves","tag-d3a-pentode-spice-model","tag-d3a-spice-model","tag-d3a-triode-spice-model","tag-d3a-tube","tag-d3a-valve"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p2r2tK-2do","jetpack_likes_enabled":true,"jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/8518","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=8518"}],"version-history":[{"count":5,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/8518\/revisions"}],"predecessor-version":[{"id":8535,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/8518\/revisions\/8535"}],"wp:attachment":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/media?parent=8518"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/categories?post=8518"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/tags?post=8518"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}