* 5842/417A Triode PSpice Model * copyright (c) 1998 Mithat Konar -- all rights reserved * Model used: "Improved VT Models for SPICE Simulations," * Norman Koren, Glass Audio 5/96. * Plate parameters determined by computerized optimization, Jan 29, 1998. * Plate data from manufacturer's published data for 5842. * Interelectrode capacitances are vaguely based on data given for Western * Electric 5842/417A; however, the reliability of the HF characteristics for * this model is probably not very high. It is likely that that additional * complexity will be required to better model the HF behavior--including the * inclusion of heater terminals in order to explicitly incorporate grid, * plate, and cathode to heater capacitances. And don't forget to add parasitic * capacitances of ~0.7 pF for adjacent pins and ~0.5 pF for others (see * Koren's article) as well as for the effects of a shield (if used). * No guarantees of any kind are made regarding the accuracy or suitability * of any part of this model. Use at your own risk. * * Connections: Plate * | Grid * | | Cathode * | | | .SUBCKT 5842 1 2 3 + PARAMS: MU=42.4 EX=2.21 KG1=393 KP=629 KVB=446 + RGI=2000 + CCG=9.0P CGP=1.8P CCP=0.48P ; E1 7 0 VALUE= +{V(1,3)/KP*LOG(1+EXP(KP*(1/MU+V(2,3)/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