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"GX5" test. The green lead is connected to the transistor only when a tetrode is being tested,
and then only after completing all other tests. Resistors RB are selected by positions of the
"B" switch.
,..----+-06
4.7 VAC
22JL
8
TRANSISTOR
,.
FIGURE 17
RESISTOR IN CIRCUIT
FOR GX5 TEST,OUT
OF CIRCUIT FOR GXi
TEST
4,75VAC
j
SILICON
RECTIFIER
+
V..
:C
I 1SY
O-SOOA
22JL
IVAC 560.n..
.320.n..
R
a
""""'---.--.-,
250JL
GREEN
.----E--.
C
BlK
FI GURE 18
YEl
100
MFO
CRYSTAL
DIODE
+
Cathode
BlK
,320.11.
RB
FIGURE 19
"Of" (Diode Forward) Test Circuit (Figure 19)
The circuit for testing forward current of crystal diodes is shown in Figure 19. Setting
of the "A" switch determines the AC voltage applied to the circuit and depends upon the diode
being tested. The diode itself serves as a rectifier for the meter circuit. The meter shunt will
be .320 ohms, plus the value selected by the "B" switch position.
Page 28
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