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P U R P O S E O F
T U B E S
I N
T H E
C O M P U T I N G
S E C T I O N
155
S Y :
( 1 2 S N 7 ) . Follower for trigger
B3
OFF
side.
Anode potential is high from 10 through 1 4
to condition B15 switch and BIO switch; also
provides a negative pulse at 1 4 to advance the
secondary timer.
BIO ( 6 S K 7 ) . Switch controlling
B16
trigger; turns
B16
OFF
at 10.5.
Grid of B10 is conditioned
to 'conduct from 10 through 14 by B92 and
suppressor receives B pulses, thus providing 4
negative pulses at 10.5, 11.5, 12.5, and 13.5
to turn B16
OFF.
Only the 10.5 pulse is used.
B l
l l
( 1 2 S N 7 ) . Works in conjunction with
B l l ?
to condition the grid of B Y switch; allows B j
to accept
A
pulses only in the primary cycles
following a carry-over in the multiplier
counter. B l l l is cut off and its anode is at
high potential when trigger B17 is
ON.
B11: ( 1 2 S N 7 ) . Works in conjunction with
B111
to condition the grid of B5 switch; allows ten
A
pulses to be ~ a s s e d by B Y provided B5 is
not blocked by B1 l l . B1
I 2
is cut off and its
anode is at high potential when trigger B16
is
ON.
B12 ( 2 5 L 6 ) . Power tube providing ten
B
pulses
to the column shift control tubes.
The
A
pulses from B6 are inverted to B pulses for the
column shift control tubes.
B13. Not used.
B14 ( 2 5 L 6 ) . Cuts off from 10.5 through 1 4 under
control of BIT switch to provide positive pulse
for carry control; carry switches are condi-
tioned to conduct by B14.
Bl 5 ( 6 S K 7 ) . Switch provided to control the carry
control power tube B14; controlled by B92
and B16.
B9:!
permits conduction from 10
through 1 4 by suppressor control, and B16
permits conduction from 1O.j through 0.5 by
grid control, thus B15 can conduct only from
10. 5 through 14. The
B16
control provides
a half-cycle delay to insure that carry can-
not occur until adding is complete.
B1
G
( 1
2 S N 7 ) . Trigger providing
10
pulse control;
ON
from 0.5 through 10.5 of every adding
cycle under control of B4 and B10 switches.
B17
(
1 2 S N 7 ) . Multiplicand read-out control trig-
ger provided to control the cycle during
which the multiplicand starts receiving rol-
ling pulses. B17 is turned
ON
by carry pulses
from the multiplier counter at 12 and turned
OFF
by the secondary timer at the end of a
column shift cycle.
B18. Test socket for secondary timer.
B19. N o t used.
B20 ( 1 2 S N 7 ) . First stage trigger of secondary
timer which triggers at 1 4 of each primary
cycle, going
ON
and
OFF
alternately.
B21
(
1 2 S N 7 ) . Second stage .trigger of secondary
timer which triggers when B20 goes
OFF,
therefore going
ON
at the second and sixth
primary cycles. B27 blocks B21 on the tenth
cycle.
B22 ( 1 2 S A T 7 ) . Third stage of secondary timer;
triggers when B21 goes
OFF,
therefore going
ON
at the fourth primary cycle and remaining
ON
through the eighth.
B23 ( 1 2 S N 7 ) . Fourth stage of secondary timer;
ON
during the 8th and 9th primary cycles
under control of B20 and B22.
When B23
goes
OFF,
a negative pulse is provided to turn
B17
trigger
OFF
and .to advance the tertiary
timer.
B24
(
1 2 S N 7 ) . Follower for
ON
side of B23 trig-
ger in the secondary timer. Provides advanc-
ing pulses for the tertiary timer (column shift
control) at the end of the 10th primary cycle.
B25. This position is used for the voltage adjust-
ing potentiometer in the
+
65
volt power sup-
ply.
8 2 6 ( 6 S 1 7 ) . Voltage control pentode for voltage
regulating circuit providing
+
65
volt supply.
B27 ( 1 2 S N 7 ) . Blocking tube to prevent
B21
trig-
ger from turning
ON
for the 10th primary
cycle; used to make a scale of ten counter
from a straight binary counter.
8 2 8 ( 2 5 L 6 ) . Normally non-conducting power
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