'59 Champ Front End / RCA 12ax7 spice model Vsupply 99 0 325 Iin 0 1 sin(0 1e-6 1000hz 0) Rg1 1 2 68k Rg2 2 0 1Meg Rc1 3 0 1.5k Rp1 99 4 100k x1 4 2 3 RCA12ax7 Cs1 4 5 .02u Rvol1 5 6 1 Rvol2 6 0 1Meg Vig2 6 96 0 x2 8 96 7 RCA12ax7 Rp2 99 8 100k Rc2 7 0 1.5k ***************** p g c *************************************************** .subckt RCA12ax7 1 2 3 ************************* eGIogVpc 20 0 value={log(v(1,3))} rGlogVpc 20 0 1 eG0 10 0 poly(1) <2,3> -3.7694e+00 1.9947e+00 5.9432e-02 eG1 11 0 poly(1) <2,3> -3.2024e-02 -4.1443e-02 -4.8236e-03 eG2 12 0 poly(1) <2,3> 1.9127e-02 -1.2189e-02 -1.5526e-03 eG3 13 0 poly(1) <2,3> -1.1354e-02 4.9339e-03 6.1016e-04 rG0 10 0 1 rG1 11 0 1 rG2 12 0 1 rG3 13 0 1 gG 2 3 value={(exp(v(10)+v(20)*(v(11)+v(20)*(v(12)+v(20)*v(13)))))/170} eP0 110 0 poly(1) <2,3> -9.9158e+0 1.9145e+0 -2.8135e+0 1.8661e+0 + 1.5643e+0 4.7240e-1 6.4276e-2 3.3101e-3 eP1 111 0 poly(1) <2,3> 9.5428e-1 3.2558e-2 -8.3349e-1 -4.8578e-2 + 2.6213e-1 1.0492e-1 1.8921e-2 1.3632e-3 eP2 112 0 poly(1) <2,3> 9.5766e-2 2.5192e-2 2.2391e-1 -1.7040e-1 + -2.4952e-1 -1.0960e-1 -2.0981e-2 -1.4882e-3 eP3 113 0 poly(1) <2,3> -6.6107e-2 -3.9657e-2 7.5560e-2 3.1025e-2 + 2.4265e-2 1.7002e-2 4.2512e-3 3.4761e-4 eP4 114 0 poly(1) <2,3> 8.4148e-3 4.7989e-3 -1.3258e-2 -1.9288e-3 + 5.2888e-4 -5.6853e-4 -2.4727e-4 -2.4359e-5 rP0 110 0 1 rP1 111 0 1 rP2 112 0 1 rP3 113 0 1 rP4 114 0 1 gP 1 3 value={(exp(v(110)+v(20)*(v(111)+v(20)*(v(112)+v(20)*(v(113)+v(20)*v(114))))))} Cgc 2 3 1.8p Cgp 2 1 1.7p Cpc 1 3 1.9p .ends .ic v(2)=-0.570591 v(3)=1.4180 v(4)=230.526 v(5)=-0.570591 + v(6)=-0.570591 v(7)=1.4180 v(8)=230.526 .tran 1e-6 1e-3 0 1e-6 .probe .end Vsupply 99 0 325 Iin 0 1 sin(0 1e-6 1000hz 0) Rg1 1 2 68k Rg2 2 0 1Meg Rc1 3 0 1.5k Rp1 99 4 100k x1 4 2 3 RCA12ax7 Cs1 4 5 .02u Rvol1 5 6 100k Rvol2 6 0 900k Vig2 6 96 0 x2 8 96 7 RCA12ax7 Rp2 99 8 100k Rc2 7 0 1.5k ***************** p g c *************************************************** .subckt RCA12ax7 1 2 3 ************************* eGIogVpc 20 0 value={log(v(1,3))} rGlogVpc 20 0 1 eG0 10 0 poly(1) <2,3> -3.7694e+00 1.9947e+00 5.9432e-02 eG1 11 0 poly(1) <2,3> -3.2024e-02 -4.1443e-02 -4.8236e-03 eG2 12 0 poly(1) <2,3> 1.9127e-02 -1.2189e-02 -1.5526e-03 eG3 13 0 poly(1) <2,3> -1.1354e-02 4.9339e-03 6.1016e-04 rG0 10 0 1 rG1 11 0 1 rG2 12 0 1 rG3 13 0 1 gG 2 3 value={(exp(v(10)+v(20)*(v(11)+v(20)*(v(12)+v(20)*v(13)))))/170} eP0 110 0 poly(1) <2,3> -9.9158e+0 1.9145e+0 -2.8135e+0 1.8661e+0 + 1.5643e+0 4.7240e-1 6.4276e-2 3.3101e-3 eP1 111 0 poly(1) <2,3> 9.5428e-1 3.2558e-2 -8.3349e-1 -4.8578e-2 + 2.6213e-1 1.0492e-1 1.8921e-2 1.3632e-3 eP2 112 0 poly(1) <2,3> 9.5766e-2 2.5192e-2 2.2391e-1 -1.7040e-1 + -2.4952e-1 -1.0960e-1 -2.0981e-2 -1.4882e-3 eP3 113 0 poly(1) <2,3> -6.6107e-2 -3.9657e-2 7.5560e-2 3.1025e-2 + 2.4265e-2 1.7002e-2 4.2512e-3 3.4761e-4 eP4 114 0 poly(1) <2,3> 8.4148e-3 4.7989e-3 -1.3258e-2 -1.9288e-3 + 5.2888e-4 -5.6853e-4 -2.4727e-4 -2.4359e-5 rP0 110 0 1 rP1 111 0 1 rP2 112 0 1 rP3 113 0 1 rP4 114 0 1 gP 1 3 value={(exp(v(110)+v(20)*(v(111)+v(20)*(v(112)+v(20)*(v(113)+v(20)*v(114))))))} Cgc 2 3 1.8p Cgp 2 1 1.7p Cpc 1 3 1.9p .ends .ic v(2)=-0.570591 v(3)=1.4180 v(4)=230.526 v(5)=-0.570591 + v(6)=-0.570591 v(7)=1.4180 v(8)=230.526 .tran 1e-6 1e-3 0 1e-6 .probe .end
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