Design of the second version of the amplifier.
The SPICE model is a tube with a slightly different adjustment to the characteristics than for the first version of the amplifier assembled as a prototype.
**** 6S63N_LV ******************************************
* Created on 07/09/2022 10:30 using paint_kit.jar 3.1
* http://www.dmitrynizh.com/tubeparams_image.htm
* Plate Curves image file: 6s63n1a2.bmp
* Data source link:
*----------------------------------------------------------------------------------
.SUBCKT TRIODE_6S63N_LV 1 2 3 ; Plate Grid Cathode
+ PARAMS: CCG=3.5P CGP=2.4P CCP=1.3P RGI=2000
+ MU=17.57 KG1=180.95 KP=47.04 KVB=148.5 VCT=0.1465 EX=1.289
* Vp_MAX=50 Ip_MAX=25 Vg_step=0.5 Vg_start=0 Vg_count=9
* Rp=8200 Vg_ac=0.5 P_max=40 Vg_qui=-1.5 Vp_qui=19
* X_MIN=190 Y_MIN=134 X_SIZE=948 Y_SIZE=662 FSZ_X=1938 FSZ_Y=1038 XYGrid=false
* showLoadLine=n showIp=y isDHT=n isPP=n isAsymPP=n showDissipLimit=y
* showIg1=n gridLevel2=n isInputSnapped=n
* XYProjections=n harmonicPlot=n dissipPlot=n
*----------------------------------------------------------------------------------
E1 7 0 VALUE={V(1,3)/KP*LOG(1+EXP(KP*(1/MU+(VCT+V(2,3))/SQRT(KVB+V(1,3)*V(1,3)))))}
RE1 7 0 1G ; TO AVOID FLOATING NODES
G1 1 3 VALUE={(PWR(V(7),EX)+PWRS(V(7),EX))/KG1}
RCP 1 3 1G ; TO AVOID FLOATING NODES
C1 2 3 {CCG} ; CATHODE-GRID
C2 2 1 {CGP} ; GRID=PLATE
C3 1 3 {CCP} ; CATHODE-PLATE
D3 5 3 DX ; POSITIVE GRID CURRENT
R1 2 5 {RGI} ; POSITIVE GRID CURRENT
.MODEL DX D(IS=1N RS=1 CJO=10PF TT=1N)
.ENDS
*$
Simulations of second version: diagram, oscillogram, frequency response and enlarged diagram of the frequency response to show the limits at a decrease of 0.5dB and the THD coefficient:
Schematic diagram:
PCB project and visualisation:
Bll of materials:
The SPICE model is a tube with a slightly different adjustment to the characteristics than for the first version of the amplifier assembled as a prototype.
**** 6S63N_LV ******************************************
* Created on 07/09/2022 10:30 using paint_kit.jar 3.1
* http://www.dmitrynizh.com/tubeparams_image.htm
* Plate Curves image file: 6s63n1a2.bmp
* Data source link:
*----------------------------------------------------------------------------------
.SUBCKT TRIODE_6S63N_LV 1 2 3 ; Plate Grid Cathode
+ PARAMS: CCG=3.5P CGP=2.4P CCP=1.3P RGI=2000
+ MU=17.57 KG1=180.95 KP=47.04 KVB=148.5 VCT=0.1465 EX=1.289
* Vp_MAX=50 Ip_MAX=25 Vg_step=0.5 Vg_start=0 Vg_count=9
* Rp=8200 Vg_ac=0.5 P_max=40 Vg_qui=-1.5 Vp_qui=19
* X_MIN=190 Y_MIN=134 X_SIZE=948 Y_SIZE=662 FSZ_X=1938 FSZ_Y=1038 XYGrid=false
* showLoadLine=n showIp=y isDHT=n isPP=n isAsymPP=n showDissipLimit=y
* showIg1=n gridLevel2=n isInputSnapped=n
* XYProjections=n harmonicPlot=n dissipPlot=n
*----------------------------------------------------------------------------------
E1 7 0 VALUE={V(1,3)/KP*LOG(1+EXP(KP*(1/MU+(VCT+V(2,3))/SQRT(KVB+V(1,3)*V(1,3)))))}
RE1 7 0 1G ; TO AVOID FLOATING NODES
G1 1 3 VALUE={(PWR(V(7),EX)+PWRS(V(7),EX))/KG1}
RCP 1 3 1G ; TO AVOID FLOATING NODES
C1 2 3 {CCG} ; CATHODE-GRID
C2 2 1 {CGP} ; GRID=PLATE
C3 1 3 {CCP} ; CATHODE-PLATE
D3 5 3 DX ; POSITIVE GRID CURRENT
R1 2 5 {RGI} ; POSITIVE GRID CURRENT
.MODEL DX D(IS=1N RS=1 CJO=10PF TT=1N)
.ENDS
*$
Simulations of second version: diagram, oscillogram, frequency response and enlarged diagram of the frequency response to show the limits at a decrease of 0.5dB and the THD coefficient:
Schematic diagram:
PCB project and visualisation:
Bll of materials:
