Making Spice Models for tubes
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 Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

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 6th December 2012, 04:02 PM #11 Osvaldo de Banfield   diyAudio Member     Join Date: Dec 2011 Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina I recently found this topic using Google and it is pretty interesting. Do anybody if it can work also with pentodes? Many thanks in advance. __________________ Osvaldo F. Zappacosta. Electronic Engineer UTN FRA from 2001. Argentine Ham Radio LW1DSE since 1987.
 29th January 2013, 03:10 PM #12 Surveytiger   diyAudio Member   Join Date: May 2010 Location: Vejen Other question/problem I have with regards to the tube models is that the ones I have come across do not have a equivalent Noise resistance at the input for simulating S/N ration in the circuits I work on (RIAA). Does anyone know how I can add a Equivalent Noise Resistance of 350 ohm (Worst Case) to the spice model of the 6N23P below? Many thanks in advance .SUBCKT 6N23P 1 2 3 ; P G K ; P G C (Triode) 26-Oct-2001 + PARAMS: MU=33.04 EX=1.220 KG1=212.4 KP=183.83 + KVB=300.0 VCT=0.00 RGI=2000 + CCG=3.6P CGP=1.5P CCP=2P E1 7 0 VALUE= +{V(1,3)/KP*LOG(1+EXP(KP*(1/MU+(V(2,3)+VCT)/SQRT(KVB+V(1,3)*V(1,3)))))} RE1 7 0 1G G1 1 3 VALUE={(PWR(V(7),EX)+PWRS(V(7),EX))/KG1} RCP 1 3 1G ; TO AVOID FLOATING NODES IN MU-FOLLOWER C1 2 3 {CCG} ; CATHODE-GRID; C2 2 1 {CGP} ; GRID-PLATE; C3 1 3 {CCP} ; CATHODE-PLATE; D3 5 3 DX ; FOR GRID CURRENT R1 2 5 {RGI} ; FOR GRID CURRENT .MODEL DX D(IS=1N RS=1 CJO=10PF TT=1N) .ENDS
 8th March 2013, 03:29 AM #13 jazbo8 diyAudio Moderator Emeritus     Join Date: Jan 2011 Location: In Transient If you already know the ENR, then you can calculate the noise figure based on the stage's configuration, it does not need to be "inside" the tube model, the methodology is outlined in Burkhard Vogel's "The Sound of Silence". Jaz
 8th March 2013, 07:53 PM #14 Surveytiger   diyAudio Member   Join Date: May 2010 Location: Vejen Thanks Jaz Yes you are right found the chapter in the book you refered to... thanks for the hint!!! Cheers Tonny
 26th March 2020, 08:28 PM #15 JohnnyE   diyAudio Member   Join Date: Feb 2020 If anyone is interested, we have launched a free graph digitizer. You can use it to extract 1000's of points on a spectral curve in seconds. Give it a try and let me know what you think. Graph Digitizer John

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