Spice 3f4 model of a low voltage direct heated signal level pentode - diyAudio
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Old 24th April 2006, 12:18 AM   #1
wa2ise is offline wa2ise  United States
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Default Spice 3f4 model of a low voltage direct heated signal level pentode

Maybe you could build a DH phono preamp with the below...

Here's a low voltage filament tube CK538DX (crosses with DF650 and CK6419):

*Vacuum Tube filament pentode (voltages referenced to negative (pin 3) end of filament)
* Calculate contribution to cathode current
*the number at the right end determines sharpness of knee
Bat at 0 V=0.636*ATAN(V(A,K)/1)
*the URAMP(V(S,K)/# mostly determines peak plate current, grid line spacing nearly constant
*the number at the right end determines slope of grid lines (plate resistance)
Bgs gs 0 V=URAMP(V(S,K)/24.8+V(G,K)*0.35+V(A,K)/4000)
*the exponent sets the linearity of grid line spacing, and big impact on peak plate currrent
Bgs2 gs2 0 V=V(gs)^1.84
Bcath cc 0 V=V(gs2)*V(at)
* Calculate anode current, grid line spacing adjust and peak plate current
Ba A K I=3.335E-4*V(cc)
* Calculate screen current
Bscrn sc 0 V=V(gs2)*(1.25-V(at))
Bs S K I=0.04000E-2*V(sc)
* Grid current (approximation - does not model low va/vs)
Bg G K I=(URAMP(V(G,K)+1)^1.5)*50E-6
* Capacitances
Cg1 G K 2.4p
Cak A K 1.75p

Cg1a G A 0.08p


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