Spice 3f4 model of a low voltage direct heated signal level pentode
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 24th April 2006, 01:18 AM #1 wa2ise   diyAudio Member     Join Date: Apr 2005 Location: NJ 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) .SUBCKT XCK538DX A S G K * * 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 .ENDS XCK538DX ************************************************** ******************************** More spice models: http://home.netcom.com/~wb2jia/tubes/spice.txt http://home.netcom.com/~wb2jia/tubes/spice2.txt http://home.netcom.com/~wb2jia/tubes/spice3.txt http://home.netcom.com/~wb2jia/tubes/spice4.txt

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