GRID DIP METER
WITH 12AT7
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COMPONENTS
C1=variable ceramics 100 pF/250VL
C2=ceramics 4700pF/250VL
C3,C4,C5=ceramics 1000pF/250VL
C6,C7=32+32microFarad/250VL or 40+40microFarad
C8=poly 3000pF/250VL
R1=47K
R2=470
R3=200K
R4=47k/1W
R5=22K/2W
DG1=Germanium diode
MA=100microA F.S.
T1=transformer for double triode tube
secondary 120-190V
secondary 6,3V / 1A
Tube=I2AT7/ECC81, I2AU7,ECC82, 6SN7