Version 4
SHEET 1 1080 736
WIRE 1008 -384 256 -384
WIRE 256 -320 256 -384
WIRE 256 -160 256 -240
WIRE 208 -112 16 -112
WIRE 224 -16 224 -64
WIRE 256 -16 224 -16
WIRE 784 -16 256 -16
WIRE 16 32 16 -112
WIRE 256 32 256 -16
WIRE 784 64 784 -16
WIRE 1008 64 1008 -384
WIRE 16 144 16 112
WIRE 256 144 256 112
WIRE 256 144 16 144
WIRE 784 176 784 128
WIRE 784 272 784 240
WIRE 784 560 784 352
WIRE 784 560 224 560
WIRE 1008 560 1008 144
WIRE 1008 560 784 560
WIRE 224 608 224 560
FLAG 224 608 0
SYMBOL Misc\\triode 256 -112 R0
SYMATTR InstName U2
SYMATTR Value 6DJ8
SYMBOL Misc\\EuropeanResistor 240 16 R0
SYMATTR InstName R3
SYMATTR Value 220R
SYMBOL Misc\\EuropeanResistor 0 16 R0
SYMATTR InstName R4
SYMATTR Value 220K
SYMBOL Misc\\EuropeanResistor 240 -336 R0
SYMATTR InstName R5
SYMATTR Value 1180
SYMBOL voltage 1008 48 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 300
SYMBOL res 768 256 R0
SYMATTR InstName R6
SYMATTR Value 1
SYMBOL zener 768 176 R0
SYMATTR InstName D1
SYMATTR Value BZX84C15L
SYMBOL zener 800 128 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D2
SYMATTR Value BZX84C15L
TEXT 16 664 Left 2 !.INC Koren_Tubes.cir
TEXT 16 720 Left 2 !.tran 0 15m 5m 50µ