Version 4
SHEET 1 880 680
WIRE -416 -32 -576 -32
WIRE -256 0 -256 -32
WIRE -256 0 -336 0
WIRE -176 0 -256 0
WIRE -336 48 -336 0
WIRE -176 48 -176 0
WIRE -416 64 -416 -32
WIRE -576 80 -576 48
WIRE -416 80 -416 64
WIRE -416 160 -416 144
WIRE -336 160 -336 112
WIRE -336 160 -416 160
WIRE -176 160 -176 112
WIRE -176 160 -256 160
WIRE -112 160 -176 160
WIRE -96 160 -112 160
FLAG -256 -32 0
FLAG -576 80 0
FLAG -112 160 Bias
FLAG -416 64 1
FLAG -336 160 2
FLAG -256 80 3
SYMBOL cap -352 48 R0
SYMATTR InstName C1
SYMATTR Value 8µ
SYMATTR SpiceLine V=100
SYMBOL cap -192 48 R0
SYMATTR InstName C2
SYMATTR Value 8µ
SYMATTR SpiceLine V=100
SYMBOL diode -400 144 R180
WINDOW 0 32 47 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName Rectifier
SYMATTR Value 1N4007
SYMBOL res -240 144 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 15k
SYMATTR SpiceLine pwr=.5
SYMBOL res -272 -16 R0
SYMATTR InstName Max.R
SYMATTR Value 27k
SYMBOL res -272 64 R0
SYMATTR InstName Pot
SYMATTR Value 29k
SYMBOL voltage -576 -48 R0
WINDOW 0 -165 -3 Left 2
WINDOW 3 -181 106 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName 45V.AC.RMS.60Hz
SYMATTR Value SINE(0 63.6 60)
TEXT -792 312 Left 2 !.MODEL 1N4007 D(Rs=0.010 Tt=2u Cjo=15p Vj=0.6 BV=1000 Ibv=5u)
TEXT -792 336 Left 2 !.tran 0 7s 0s .1s startup
TEXT -448 256 Center 2 ;45V AC RMS In, no grid current, 50K bias pot set to 29K
TEXT -736 -104 Left 4 ;Basic Tube Amp Fixed Bias Circuit
TEXT -840 120 Left 2 ;45V AC RMS = 63.6V Peak
TEXT -32 352 Right 1 ;By Rob Robinette
TEXT -112 176 Center 1 ;To power tube\ngrid leak resistors