Eico 667 - SCHEMATIC DIAGRAMS; Leakage Test Schematics; Adjustment and Pentode;Triode Merit Schematics

PAG
E
1
0
667
TUBE
TESTER
-70V
-70V -70V
-70
V
R8+R7
R8+R7
R8+R7
R8+R7
>
7)«
y
/<
.TO
FIL.VOL.
TO
FI
L.
VOLT.
TO
FIL.VOLT.
TO
FIL.VOLT.
a) CATHODE
-TO-HEATER
b)
PLATE-TO-ALL c) SCREEN-TO-ALL
LEAKAGE
TEST
LEAKAGE TEST
LEAKAGE
TEST
d)
GRID- TO
-ALL
LEAKAGE
TEST
-70V
R8+R7
A
RI9
+
RI8
RI6
GRID
4
>‘
R9
PLATE
(|)2
d)3
Rs
4)1
+
(9
Ml
R9
PLATE
(J)2
RI6
GRID
TO
FIL.VOLT.
“
TO
FIL.
VOLT.
e) LINE
ADJUST
f) MERIT TEST OF
TYPICAL
PENTODE
g)
MERIT
TEST
OF
TRIODE
1
of a DUO-TRIODE