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PURPOSE OF TUBES
I N THE
C O M P U T I N G S E C T I O N
Al. Not used.
A2.
Not
used.
A3. Neon indicating bulb for manual pulser.
A4. Dial switch.
AT. Jack-plug for manual pulsing contact.
A6. Test Socket position for
MP
counter input
triggers in C chassis.
A7 (VR-I TO). Voltage regulator tube for multi-
vibrator to mainrain +I50 volts at anodes of
MV to insure frequency stability.
A8 (12SN7). Manual pulse trigger to provide
true square wave output from manually con-
trolled pulser.
A9 (12SN7). 5 cycle multivibrator used for vis-
ual observation of computarion when dial
switch is set to 5 cycles.
A1 0 (1 2SN7). 3 5,000 cycle multivibrator used
as master timer for all computations; gener-
ates essentially square waves of 3 5,000 cycles
per second frequency.
A1 I (12SN7). Clipper for multivibraxor output;
provides square wave output at anode of sec-
ond stage.
AI2. Not used.
A1 3. Test socket position for control triggers in
A chassis.
A141 (12SN7). Blocking tube for A22 trigger to
prevenx A22 from turning
ON
as long as A201
is non-conductive, and thus allows A22 to
turn
ON
only in 6th column shift cycle.
A1 42 (1 2SN7). Follower tube which conducts
when A15 trigger is
ON;
~rovided t o block
the A22 trigger from turning
ON
again at 0
of 2nd through 10th primary cycles during
6th column shift cycle.
A1
T
(1 2SN7). Trigger controlling single entry
of half-correction pulses through A142 fol-
lower tube; allows five half-entry ~ulses to
enter product counter only once. Turned
ON
at 5 during the 1st primary cycle of the 6th
column shift cycle from a negative pulse from
A22 trigger; turned
OFF
by cancelling.
A1 6 (25L6). Power tube conrrolled by clipper
output; produces square wave A pulses for
operation of computing section.
A1 71 (1 2SN7). Follower for right-hand tube of
5 cycle MV; provides 5 cycle pulses to clip-
pers and is necessary because direct coupling
is required for such slow operation.
A172 (12SN7). Inverter from second stage of
clipper to provide pulses of proper phase ro
A16 power tube.
A1 8 (2TL6). Power tube controlled by clipper
output; produces square wave B pulses for
operation of computing section. B pulses are
180" out of phase with A pulses.
A19. Not used.
A201 (1 2SN7). Normally non-conducting triode
which controls A141 blocking tube; prevents
A22 trigger turning
ON
until 6th column
shift cycle when A201 is conductive.
A202 (1 2SN7). Follower tube for A261, rhe
OFF
tube of the first stage of the primary timer.
Used to avoid loading of trigger; conducts
when A26 trigger is
OFF.
A21 (6SK7). Switch tube providing negative
pulses ar T , 7, 13, and 15; turns trigger A22
OFF
at
T
after A22 has been turned
ON.
Neg-
ative pulses at 7, 13, and IT are not used.
A22 (1 2SN7). Trigger controlling five pulses for
half-correction;
ON
from O through
T
of 1st
primary cycle during 6th column shift and
conditions A23 switch ro accept 5 B ~ulses
for half -correction.
A23 (6SK7). Switch controlling ~ulses for half-
entry; suppressor receives continuous stream
of B pulses but grid conditions switch only
when A22 trigger is
ON.
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