{"id":8802,"date":"2020-09-02T09:53:37","date_gmt":"2020-09-02T08:53:37","guid":{"rendered":"https:\/\/www.bartola.co.uk\/valves\/?page_id=8802"},"modified":"2020-09-02T09:53:37","modified_gmt":"2020-09-02T08:53:37","slug":"d3a-pentode","status":"publish","type":"page","link":"https:\/\/www.bartola.co.uk\/valves\/valve-curves\/d3a-pentode\/","title":{"rendered":"D3a Pentode"},"content":{"rendered":"

Traced curves of a Siemens sample measuring 103%:<\/p>\n

\"\"<\/a>
D3a Triode Curves<\/figcaption><\/figure>\n

Pentode curves:<\/p>\n

\"D3a <\/a> <\/div> <\/div>
\"D3a <\/a> <\/div> <\/div>
\"D3a <\/a> <\/div> <\/div> <\/div> <\/div>\n

Spice Model<\/p>\n

Here’s the model fit using Derk’s tool:<\/p>\n

\"\"<\/a>
D3a pentode model fit<\/figcaption><\/figure>\n
\"\"<\/a>
D3a triode model fit<\/figcaption><\/figure>\n

And the triode and pentode models. They can be downloaded here: D3a-Triode<\/a>\u00a0, D3a-Pentode-100V<\/a><\/p>\n

****************************************************<\/p>\n

.SUBCKT D3a-Pentode-100V 1 2 3 4 ; A G2 G1 C;<\/p>\n

* \u00a0 \u00a0 \u00a0Extract V3.000<\/p>\n

* Model created: 10-Jun-2020<\/p>\n

*<\/p>\n

* Curves traced and model developed by Ale Moglia<\/p>\n

* (c) 2020 Bartola Valves<\/p>\n

* www.bartola.co.uk\/valves email: valves@bartola.co.uk<\/p>\n

*<\/p>\n

*<\/p>\n

X1 1 2 3 4 PenthodeDE \u00a0MU= 77.9 EX=1.433 kG1= \u00a025.7 KP= 587.2 kVB = \u00a02940.0 kG2= \u00a0106.5<\/p>\n

+ Ookg1mOokG2=.29E-01 Aokg1=.13E-04 alkg1palskg2=.29E-01 be= \u00a0.049 als= \u00a02.57 RGI=2000<\/p>\n

+ CCG1=6.8P \u00a0CCG2 = 0.0p CPG1 = 0.04p \u00a0CG1G2 = 9.5p CCP=0.05P \u00a0;<\/p>\n

.ENDS<\/p>\n

****************************************************<\/p>\n

.SUBCKT PenthodeDE 1 2 3 4; A G2 G1 C<\/p>\n

*<\/p>\n

* NOTE: LOG(x) is base e LOG or natural logarithm.<\/p>\n

* For some Spice versions, e.g. MicroCap, this has to be changed to LN(x).<\/p>\n

*<\/p>\n

RE1 \u00a07 0 \u00a01MEG \u00a0 \u00a0; DUMMY SO NODE 7 HAS 2 CONNECTIONS<\/p>\n

E1 7 0 VALUE=<\/p>\n

+{V(2,4)\/KP*LOG(1+EXP(KP*(1\/MU+V(3,4)\/SQRT(KVB+V(2,4)*V(2,4)))))}<\/p>\n

E2 \u00a0 8 0 VALUE = {Ookg1mOokG2 + Aokg1*V(1,4) – alkg1palskg2*Exp(-be*V(1,4)*SQRT(be*V(1,4)))}<\/p>\n

G1 \u00a0 1 4 \u00a0VALUE = {0.5*(PWR(V(7),EX)+PWRS(V(7),EX))*V(8)}<\/p>\n

G2 \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))))}<\/p>\n

RCP \u00a01 4 \u00a01G \u00a0 \u00a0 \u00a0; FOR CONVERGENCE A \u00a0– C<\/p>\n

C1 \u00a0 3 4 \u00a0{CCG1} \u00a0 ; CATHODE-GRID 1 C \u00a0– G1<\/p>\n

C4 \u00a0 2 4 \u00a0{CCG2} \u00a0 ; CATHODE-GRID 2 C \u00a0– G2<\/p>\n

C5 \u00a0 2 3 \u00a0{CG1G2} \u00a0 ; GRID 1 -GRID 2 G1 \u00a0– G2<\/p>\n

C2 \u00a0 1 3 \u00a0{CPG1} \u00a0; GRID 1-PLATE G1 – A<\/p>\n

C3 \u00a0 1 4 \u00a0{CCP} \u00a0 ; CATHODE-PLATE A \u00a0– C<\/p>\n

R1 \u00a0 3 5 \u00a0{RGI} \u00a0 ; FOR GRID CURRENT G1 – 5<\/p>\n

D3 \u00a0 5 4 \u00a0DX \u00a0 \u00a0 \u00a0; FOR GRID CURRENT 5 \u00a0– C<\/p>\n

.MODEL DX D(IS=1N RS=1 CJO=10PF TT=1N)<\/p>\n

.ENDS PenthodeDE<\/p><\/blockquote>\n

And triode:<\/p>\n

****************************************************
\n.SUBCKT D3a-Triode 1 2 3; A G C;
\n* Extract V3.000
\n* Model created: 10-Jun-2020
\n*
\n*
\n* Curves traced and model developed by Ale Moglia
\n* (c) 2020 Bartola Valves
\n* www.bartola.co.uk\/valves email: valves@bartola.co.uk
\n*
\n*
\nX1 1 2 3 TriodeK MU= 77.92 EX=1.515 KG1= 25.7 KP= 587.2 KVB= 2940. RGI=2000
\n+ CCG=6.7P CGP=3.3P CCP=1.0P ;
\n.ENDS<\/p>\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<\/p><\/blockquote>\n

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

Traced curves of a Siemens sample measuring 103%: Pentode curves: Spice Model Here’s the model fit using Derk’s tool: And the triode and pentode models. They can be downloaded here: D3a-Triode\u00a0, D3a-Pentode-100V **************************************************** .SUBCKT D3a-Pentode-100V 1 2 3 4 ; A G2 G1 C; * \u00a0 \u00a0 \u00a0Extract V3.000 * Model created: 10-Jun-2020 * * … Continue reading “D3a Pentode”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":193,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"jetpack_post_was_ever_published":false,"footnotes":""},"class_list":["post-8802","page","type-page","status-publish","hentry"],"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/P2r2tK-2hY","jetpack_likes_enabled":true,"jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/pages\/8802","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/types\/page"}],"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=8802"}],"version-history":[{"count":1,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/pages\/8802\/revisions"}],"predecessor-version":[{"id":8812,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/pages\/8802\/revisions\/8812"}],"up":[{"embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/pages\/193"}],"wp:attachment":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/media?parent=8802"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}