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134
T Y P E
6 0 3
E L E C T R O N I C
M U L T I P L I E R
Triodes M211 through M161 in t u r n control six
25L6 power tubes, M28 through M23 (Section
53). Obviously, the operation of the power tubes
will be in reverse to that of the triodes, that is,
M28 is non-conducting when M2 11 is conducting.
The grid of M28 is at the midpoint of a voltage
divider between -1 00 volts and the anode of M2 11
so that when M211 is conducting, the grid of M28
is at -25 volts, M28 is cut off, and the potential
at its anode rises to +IT 0 volts.
The power tubes M2 8 through M2 3 control the
multiplying control switch tubes in the C chassis
(C3, C6, C9, C12, C l 5 , C18) as well as the switch
tubes M35 through M30 (Section 54) which pro-
vide the 10 pulses to the corresponding row of
column shift switches.
T w o voltage dividers are
connected to the anode of M28, one to control the
grid of C18 switch and one t o control the sup-
pressor of M3 5 switch.
The ones 'controlling the
multiplying control switches1 are shown in the C
chassis. During the 1st column shift cycle M28 is
cut off and the potential at its anode is
+
15 0 volts.
This permits the suppressors of both C18 and M3 5
to rise above cu.toff and to accept whatever pulses
are applied to their grids.
C18 accepts the
+
pulses at 12 of each primary cycle to advance the
6th multiplier counter position, while M35 accepts
the 10 B pulses fed to its grid through the .02 mfd
coupling capacitor at post M12. The 10 B pulses
are produced by tube B12 in the B chassis. These
IO B pulses produce IO
A
pulses of 100 volts ampli-
tude at the anode of switch tube M35 and are fed
to the grid of power tube M42 through a 250
mmfd coupling capacitor. M42 is normally con-
ductive since its grid is tied to the midpoint of a
voltage divider between +1 50 and -100 volts.
Each of the negative shifts a-t the anode of M35
cuts off M42 and produces a positive shift in volt-
age at the anode of M42.
Thus the 10
A
pulses
at the grid of M42 are reproduced as 10 B pulses
at the anode. These 10 B pulses at 100 volrs am-
plitude from M42 are passed on to the suppressors
of all the column shift switch tubes ( 0 chassis)
which are associated with the 1st column shift.
In -the same manner described above, M41 power
tube produces 10
B
pulses to pass on to column
shift switches during the second column shift
cycle; M40 does the same during the third column
shift, etc.
Also, in
a
manner already described,
power tubes M27 through M23 successively condi-
tion rhe multiply control switches, C I I , C12, C9,
C6, and C3 to permit successive positions of the
multiplier counter to become active.
As will be
explained later, the M23 power tube also controls
the half-entry circuits and provides the compute
stop impulse.
Figure 123 is a block diagram of all the column
shift controls showing a timing chart of the opera-
tions.
A
careful study of this diagram will assist
in understanding the column shift operations.
NOTE:
The voltage divider for establishing, the
normal grid bias for tubes M3 5 through M30 is
shown connected directly to the grid of M35.
This divider should be connected on the com-
mon bus on the other side of the .0047 megohm
grid resistor.
Some machines were erroneously
wired as shown on the wiring diagram and
should be corrected in the field.
Carry Control and Carry Circuits
Since the multiplicand factor must be added
over and over in the product counter, it is neces-
sary to provide a means for carrying from one po-
sition to the next higher order.
T o keep the
counter chassis standard and thus permit the same
chassis to be used in all counter positions, the carry
circuits are not incorporated in the same chassis as
the counter.
The
W
and
X
chassis contain the
carry triggers and carry switches. Only the firs-t
two rows of tubes in these chassis are used.
The
rest of the positions contain indicator sockets,
blanks, or spare tubes. The tubes in rhe first verti-
cal row of the
Tir
and
X
chassis are the carry trig-
gers, while the second row contains the carry
switches.
The indicator socket in W13 indicates
the status of the carry triggers 1 through 6, while
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