Sect. IV Page 23
SCHEMATIC DIAGRAM NOTES
1. Heavy solid line shows main signal path; heavy dashed Line shows control, secondary signal, or feed-
back path.
2. Heavy box indicates front-panel engraving; light box indicates chassis na rking.
3. Arrows on Potentiometers indicate clockwise rotation as viewed from the round shaft end, counter-
clockwise from the rectangular shaft end.
4. Resistance values in ohms, inductance in microhenries, and capacitance in micromicrofarads unless
otherwise specified.
5. Qotary switch schematics are electrical representations.
6. Relays shown in condition prevailing during normal instrument operation.
+
+ indicates a selected part. See parts list.
\: * Value adjusted at factory. Part may be omitted.
VOLTAGE AND RESISTANCE DIAGRAM NOTES
1. Each tube socket terminal is numberedand lettered to indicate the tube element and pin number, as
follows:
* = no tube element P= plate
H' = heater T= target (plate)
K 3 cathode R= reflector or repeller
G = control grid A= anode (plate)
sc = screen grid s= spade
Sp = suppressor grid Sh = shield
Hm = heater mid-tap NC = no external connection to socket
+*
Is = internal shield A= indefinite reading due to circuit (See 2.)
.-
I.
The numerical subscript to tube-element designators indicatesthe section of a multiple-section tube;
the letter subscript to tube-element designatars indicates the functional difference between like ele-
ments in the same tube section, such as t for triode and p for pentode. .,.
.,
7- -A ..
: '.
A socket termfial wiih an asterlkkmay 6cused as a6&p&d'atid ,.. m'boave . ~ . awoltage and resistance
shown . ;*>' 2
. .-- ..* .
d.
*Y
*-
2. Voltages values shown are for guidance; values may v&ry.frod those shbwh &le to tube aging or nor-
ces betw'6eti' ingtXl&entso$ I?5ht&nce .vduesi-inay varyc considerably .from those shown
'
e&- contains+.potentiometers", -crystal &odd$, OF Mectrolvic capacitors.
3. Voltage measured at the terminal is shown above the line, resistance below the line; measurements
made with an electronic multimeter, from terminal to chassis ground unless 2therwise noted.
4. A solid Line between socket terminals indicates a connection external to the tube between the termin-
als; a dotted line between terminals indicates a connection inside the tube. Voltage and resistance
are given at only one of the two joined terminals.
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