Clarified Schematics Introduction Schematic

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Manufacturer:Clarified Schematics

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Page 1:


The diagrams on the yellow sheets in this section indicate the
breakdown of the individual bands cf the multi-wave band receivers speci-
fied in the corner cards and shown in the respective manufacturers' seo-
tions in the main part of this Manual. Those schematics for which break-
dovms have been made bear a designation ( ) in the upper'margin.

The purpose of these breakdowns is to show how the components, that is the

coils, condensers and switch contacts, are used when the receiver is set

to different bands. VIn the majority of cases the circuits shown are the
r-f and oscillator systems; however, in a few instances, a-f breakdowns \
are given. I
The switch contacts which are associated with the various circuits,
are represented as small circles, bearing either numerical or alphabeticalv
designations corresponding to those designations shown upon the complete ;
diagram contained in the respective manufacturers' sections in the main part 1
of the Manual. The connections between the switch points are shown by dot-
ted lines.
Each of the main diagrams, that is complete schematics, shows
the wave-band switch in a certain position; usually this is the broadcast- '
band position. This same position is shown as the first position in the
breakdown diagram unless the contrary is specified. ReSerence in the break-
down diagrams to the fact that the switch is shown as having been moved from
one position, indicates the first position inmmdiately following eithe; the `
`broadcast band, if that is the first shown, or whatever the band :my be which 3
is the first shown. Expressed differently this is, if the designation is `
"switch moved one position", this means that the wave-band switch has been

turned one position from the reference point designated as "switch as shown". !%

CDJOhn F. Rider, Publisher

Page 2:

When all switches associated with the movement turn in the same direction,
this is specified as "clockwise" or "counter-clockwise" as the case may be.

You will note that corner cards on some of the "Clarified Schematic"
breakdowns indicate several receivers. This means that the r-f and cscilletor
sections, as shown in the breakdown, apply to those receivers. However, this
should not be construed as signifying that ell these receivers are the some
throughout. It simply means that the wave-bend positions and associated
circuits ere the same for each model or chassis listed under the same

In some cases sections of the wave-band switch are used to short-
circuit coils which are not in operation on the particular band shown in the\
schematic. In cases where inclusion of these shorted coils unnecessarily
complicates the breakdown, they have been omitted, since they are not essen-
tial to the operation of the signal-carrying circuits.

l In the case of audio-frequency circuit breakdowns, the designations
shown upon the breakdown schematics correspond with the designations shown
upon the complete schematics.

For your convenience the pin terminals for each tube represented
in the breakdown diegrams have been numbered according to the RMA system.

You will note that in some cases the bands are identified in accord-
ance With the frequency range covered. Then again in some instances these
frequency ranges are omitted. The reason for the omission is that we were
unable to identify the specific ranges covered by the various bands and it
was felt that, since all receivers do not employ switch arrangements Which
:increase the frequency range in exact sequence as the range switch is advanced,
it was deemed advisable to speak simply in terms of the switch positions,

rather than the frequency ranges. Of course, where the frequency range was

? known it has been identified.

(C)J?hn r. Rider, Publisher

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