All resistors are marked w1th the standard RMA color code. The colors represent
numbers as follows:
0- black 5- green
1- brown 6- blue
2- red 7- violet
3- orange 8- grey
4- yellow 9- white
The body color of the resistor is the first digit of its resistance value; the end
color is the second digit; and the dot or center band represents the number of
ciphers after the first two digits. If no dot or center band can be seen, then it is
the same as the body color. For instance, the resistance for a red body, green end
and orange dot or center band would be all follows: first digit 2,second digit 5,
followed by three ciphers: thus, 25,000 ohms.
Chokes and audio transformers may be tested by reference to their direct current
resistances given with the circuit diagrams. If a winding is broken, the resistance
will be infinite, and a short circuit will be indicated by greatly reduced
resistance. The power transformer and filament transformer may be checked by
comparing their voltages with those given on the diagrams. It should be remembered
that all given voltages are for 115 volt A.C. line and for any reduction in line
voltages they will be correspondingly affected.
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