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PURPOSE O F TUBES
I N THE
C O M P U T I N G
S E C T I O N
159
duction during 6th column shift cycle. M23
also turns A3 1
OFF
at end of 6th column shift
cycle to srop computations.
M24 ( 2 i L 6 ) . Stops conducting when MI71 con-
ducts during 5th column shift cycle to con-
dition multiply input switch C6 and column
shift control switch M3 1.
M 2 j ( 2 i L 6 ) . Stops conducting when MI81 con-
ducts during 4th column shift cycle to con-
dition multiply input switch C9 and column
shift conrrol switch M32.
M26 ( 2 j L 6 ) . Stops conducting when MI91 con-
ducts during 3rd column shift cycle to con-
dition multiply input switch C12 and column
shift control switch M3 3.
M27 ( 2 j L 6 ) . Stops conducting when M201 con-
ducts during 2nd column shift cycle to con-
dition multiply input switch C I 5 and column
shift control switch M34.
1M28 (2jL6). Stops conducting when M211 con-
ducts during the 1st column shift cycle to
condition multiply input switch C18 and col-
umn shift control switch M3 5.
M29. Not used; spare 12SN7 mounted in this
position.
M30 (6SK7). Switch controlling stream of 10
pulses to column shift switches for adding
into product counter on 6th column shift
cycle; suppressor is conditioned to conduct by
M23 and grid receives ten B pulses.
M3 1
through
M3
j
(6SK7). Same as M30 for 5 th
through 1st column shift cycles.
M36. Not used; spare 12SN7 tube mounted in
this position.
M37 ( 2 j L 6 ) . Power tube supplying ten B pulses
to column shift switches in
0
chassis during
the 6th column shift cycle under control of
switch M30.
M3 8
throz~gh
M42 ( 2 j L 6 ) . Same as M37 for 5 th
through 1st column shift cycles.
N I (6SK7). Half-entry input switch for first
position of products counter; 5 pulses from
A24 during first primary cycle of last column
shift cycle are passed to units position of
product counter provided the units position
is wired for half-entry.
N21 (12SN7).
Inverter
controlling
read-out
pulses from B30 to units position of the prod-
uct counter for rolling product counter when
punching; positive pulses from B30 are in-
verted to negative pulses for operating the
triggers in the counter.
hr22, hTj, N8, N l I , N14,
arzd
N17 (12SN7).
'
Same as N21 for 2nd through ITth positions
of the product counter.
N3
1
(1 2SN7). Clipper for re-shaping the output
from column shift switches in
0
chassis ro 1st
position of product counter. Because of rhe
internal capacity of the parallel switches in
the
0
chassis, the waveform leaving the
0
chassis is far from a square wave and the
voltage amplitude of different positions varies;
therefore the output from the
0
chassis must
be re-shaped before entering the products
counter.
N3z (12SN7). Inverter for clipper N31.
Re-
quired because of phase reversal by clipper;
,the
A
pulses leaving the column shift switches
are inverted to B pulses by the clipper, hence
they must be inverted again to A pulses be-
fore entering the products counter.
N4, N7, NIO, N13,
and
N16 (6SK7). Same as
N 1 for 2nd through 6th positions of product
counter.
N6, N9, N12, N l
j,
and
N18. Same as N31 and
N32 for 2nd through 6th positions of ~ r o d u c t
counter.
0 1
through
0 6 (6SK7). Column shift switches
controlling exit from f i r s ~osition of multi-
plicand counter to 1st through 6th positions
of product counter. Grids of these switches
are all conditioned by multiplicand output
trigger and follower L41; suppressors succes-
sively receive stream of ten B pulses in reverse
order 0 6 , 0 5 , etc. from proper column shift
control power tube in M chassis.
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