This is one of the other great DHTs I received from Vegard Winge for tracing.
Here are the curves and the SPICE model: 864 DHT Composite
The SPICE composite model based on Dmitry’s:
**** 864 VT-24 DHT Composite ****************************************** * Created on 03/16/2013 19:30 using paint_kit.jar * www.bartola.co.uk/valves * Curves image file: 864 SMALL.jpg * Data source link: 864 SMALL.jpg * Created by Ale Moglia [email protected] *---------------------------------------------------------------------------------- .SUBCKT TRIODE_864-Composite 1 2 3 4 ; Plate Grid K1 K2 + PARAMS: CCG=2.3P CGP=5.3P CCP=1.3P + MU=7.14 KG1=13560 KP=98 + KVB=1.88 VCT=-0.07 EX=1.41 RGI=2000 * Vp_MAX=200 Ip_MAX=0.008 * Vg_step=2 Vg_start=0 Vg_count=11 * END PARAMS ----------------------------------------------------------------------- * cathode resistor is 4.4 ohm, the pins K1 and K2 are 1.1 ohms from the ends of it RFIL_LEFT 3 31 1.1 RFIL_RIGHT 4 41 1.1 RFIL_MIDDLE 31 41 2.2 E11 32 0 VALUE={V(1,31)/KP*LOG(1+EXP(KP*(1/MU+V(2,31)/SQRT(KVB+V(1,31)*V(1,31)))))} E12 42 0 VALUE={V(1,41)/KP*LOG(1+EXP(KP*(1/MU+V(2,41)/SQRT(KVB+V(1,41)*V(1,41)))))} RE11 32 0 1G RE12 42 0 1G G11 1 31 VALUE={(PWR(V(32),EX)+PWRS(V(32),EX))/(2*KG1)} G12 1 41 VALUE={(PWR(V(42),EX)+PWRS(V(42),EX))/(2*KG1)} RCP1 1 3 1G RCP2 1 4 1G 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 D4 6 4 DX ; FOR GRID CURRENT RG1 2 5 {RGI} ; FOR GRID CURRENT RG2 2 6 {RGI} ; FOR GRID CURRENT .MODEL DX D(IS=1N RS=1 CJO=10PF TT=1N) .ENDS *$
Hope this is useful…
Ale