Evening star., 1924-11-14


The 3 terminal of transformer 10
should be connected with the Is ter
minal of condenser 16 and with the
A spring of jack :.
The r spring of jack : should be
connected with the p terminal OF
transformer 10. The G spring of jack
: should be connected with the Il
terminal of transformer 19
Next connect the terminal of
condenser II with the q terminal of
transformer 19 and the Il terminal of
of socket IS
If you cannot slip the Is terminal of
condenser II over the positive ter
minal of { battery 90, either because
you cannot get that type of condenser
or that type of G battery, be sure to
connect the B terminal of the con-
denser with the positive terminal of
the & battery.
Next connect the A terminal of
transformer 10 with the negative 40
volt terminal of e battery 20.
Now connect together, in the order
named, the spring of jack 9. the
ID spring of jack and the positive
b battery terminal "a.
Then connect the a spring of jack
8 with the + terminal of socket Is.
The positive terminal of the c bat
terry 20 should be connected with the
wire which runs to the negative A
battery terminal %.
Wiring Completed.
The wiring of the receiver is COM
pleted by connecting the b terminal
of tuning unit 6 with the ground
post >
The best way to do this is TO run
horizontal wire from terminal B
of the tuning unit away from the
panel toward the back of the set for
about a inches and then bend it at
right angles toward the antenna and
ground terminal end of the panel.
then bend it toward the panel and
then down to the ground post along
the panel.
Best results are obtained with the
CN-2UlA or C-301A tubes. The dry
cell tubes may be used, but will not
give as good results. With 6-volt
tubes 6-volt storage battery should
be used. a small one may be en-
ployed. but a large one Of the 100
ampere-hour capacity type will give
greater freedom from trouble and
the nuisance of constantly having to
recharge the battery.
Best results also are obtained by
using a plate voltage as high as 1875
volts, although very good results can
be obtained also with a b battery of
80 volts
If the same parts are used and di-
rections have been followed the set
should work properly as soon as the
aerial, ground and batteries are con-
nected. the tubes inserted and the
phones or loud speakers plugged in.
Experiment With CondenserS.
If YOU have not used the same parts
it may be necessary for you to ex-
pertinent with different values Of
fixed condensers to get the values
that will work properly
If you find that the first stage
works well. but that sQueal comes
in when YOU plug in on the second
stage, try cutting down the flament
current to some extent. If this does
not remedy the trouble. try increas-
ing the capacity of condenser IL If
you find that there is no tendency to
howl on the second stage, but the
volume is not very great, try de-
creasing the capacity of condenser II
or even taking it out altogether. if
the absence of the condenser does
not cause the set to howl.
Tuning of the set is very simple.
Merely turn on the rheostat after
having closed switch 5; experiment
with the setting of the tuning in
strument, moving the condenser
through its range for every lode
gree change in the tuning unit After
signal is heard 1t can be adjusted
to its best point by manipulating
both controls and slightly readjust-
ing the rheostat. If only one tube is
to be used the filament circuit of the
second tube should be opened by