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1
shown in Table I. The data for the
replacement rates given in this
table are obtained from the curves
shown in Fig. 1. The percentage of
change on life is computed on
basis of absolute values of change
from zero -hour value for each tube.
Many equipments are designed so
that circuits require minimum
values of certain tube characteristics
for proper performance. For
example, a circuit using 6101/
7'.
loo
90
BO
/ LIFE (HOURS)
100
90
BO
70
60
so
40
30
20
10
a
o
LIFE (HOURS) 1000
NG OF TUBES 376
LIFE (HOURS)
840F TUBES
SOU
380
I
/
/ LIFE
W/1111.1
4
7 9 10
PLATE MILLIAMPERES
-NO OF TUBES.°38 0
(HOURS)
NO OF TUBES
500
380
_
TYPE 6101 /6J6-WA
(TRIODE UNIT NO.n
CONDIT ONS
TEST LIFE
HEATER VOLTS 6 3 6.3
PLATE VOLTS 100 100
GRI VOLTS 0 O
CATHODE RESISTOR
(OHMS) 50 50
GRID RESISTOR
SI 0.5
HEATER -CATHODE VOLTS ISO
BULB TEMPERATURE
(MIN,C) (65
LIFE (HOURS)
NO. N0.
0
380
LIFE MOURS1000
NO 01 TUBES 376
II 12
Fig. 9: Reliability of 6101 /6J6 -WA
Fig. 10: Number of tubes vs. Gm change
(,.t.,
LN
H OURES 07
OF
LIFE HOURS) 1000
NO. OF TUBES 509
TYPE 6186/6ÁG5 WA
CONDITIONS
TEST LIFE -
HEATER VOLTS
63 6.3
PLATE VOLTS
250 250
GRID NO) VOLTS
O -
5O 5p
CATHODE RESISTOR
(OHMS) 20p 0 200
GRID 1.0
100
165 -
NO. I RESISTOR (MEGOHMS)
HEATER CATHODE VOLTS
BULB TEMPERATURE (MIN.,C)
UFE ((HOURS) 500
NO. OF TUBES 517
LIFE (HOURS) 1000
NO. OF TUBES 509
I
10 20 30 40 50 60 70
6J6WA tubes may require minimum
values of plate current as
shown in Table II. The data for the
replacement rates given in this
table are obtained from the curves
shown in Fig. 2.
(Continued on page 348)
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