USEFUL I NFORMATION FOR KIT BUI LDERS:\\\i\\\\\\\\\\\\\\\\\\\\\\:i:\:
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Resistors are identified by a color code used in several bands around the resistors. There are two
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ance code'uses three bandJ or colors, while a fourth, usually silver or gold, indicates the tolerance. The
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"" that the first iwo inaiiati tt'e ni9lti".-qg-"'.;.ith;i9"i"1t"..,^*rtil.
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the third indicates the number of digits (zeros or multiplier) wbich follow the first two figures
Onuninsulatedresistors,thebodyisthefirstfigure,theendcolorthesecondfigure,an'dtheffi
th?nrs'neure'
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f**itia:"iJ.'J:*iil;"f;-'tt':ii*:l*::i:lit*'"tm::1#;fit3'"
zu/.
Resistors are rated as to wattage (power dissipation) according.to size.
WATTAGE.
The chart shows approximate sizes which vary with manufacturers. To determine watacr.oss
tage size necessary-inultiply current through,.resistor in ar4peres by voltage dro_p_
.eEistors in volts. Exampie - A plate loading resistor for a tube drawing 10 milliamperes (.01 Amperes) has a voltage on one side of 300 volts and- on the other side
I Watt.
200 volts,'giving i drob of 100 volts: Therefore 100 volts X .01A.
A higher wattage resistor can always be substituted for smaller size.
Uninsulated
Insulated
Oolor
.
\--n'1
Black
Brown
- - -___;B -,+- : __--Orange
Yellow
Green
Blue
\/iolet
Grey
White
Body Color
First Ring
End Color
Second Ring
F irat Flgure
Second Figure
_
Number
s
SIZES
/N'ULATED TYPE
Band
forth
fur Toletance
t
of Digita
-o
=-*
+
s
e
t
sg
+
s
o
i
s
E
None
r
i
-f:-=
WATTAC
Dot Color
Third Ring
0
0
w.
:xrlju
o'gqq
q0,qqq
qqq,ggg
g , g g g , g q q BROWN RED ORANGE
qq,gqg,qgs
L
z
o
o
o
000.000,000
tsR()\^/N R E D O R A N q E
z
ooo
l
S o m e P o p u l a rS i z e so f R e s i s t o r s
IN OHMS
50
250
1500
30 , 0 00
220,000
1 Meg:ohrn
IIESISTANCE
OR
FIRSII
Green
Red
Rrown
Oran ge
Red
Bro wn
BODY
.
END
BANI)
OIt
Str)C:OND
Black
Green
Green
Black
Red
Black
DOT
BAND
OR
THIRD
Black
IJrown
Red
Orang:e
YelIow
Green
BAND
The fourth lins or other end mav be "tty?nit9.o",.l3i3I?,r1"%;",giJg"i,Xz:
tolerance;
or iT may
be omitted
entirely
C o n d e n s e rC o d e
Condensers use the same code as resistors and are read in micromicrofarads.
direction as
If there is one row of dots, they are read in direction of arrow or if manufacturer's name -aqp_earsin the same
War Stand-ard).
AWS'(American
RMA
or
the
The
codes:
of
different
be
two
eiiiter
of
dfti^"ppiirlli.i"
rows
,ru-..-it-t--o
jr. ttt. fi.st thre. figures (carried to three figures), the bottom row are left to right the voltage
In the RMA, the top r;;-;ae;i;
multiplier'
decimal
and
rating, tolerance,
left to right, characteristic,
In the AWS code, the top row of dots are the first three figures while the bottom row are,
multiplier.
decimal
tolerance, and
Exarnples
'f-- ,ft
r{" tA/ 'S
A
t u & '
r'1
RED
z
GR
EN
s
tsROWN
o
z ' 5 0 M M F = . O O O2 5 M F
BROWN RED
GREEN
BROWN
L
Z
5
0
lzSO MMF =.OOlzgMF
7,i DOr
ALWA\6
SLACK
BLACK
BROWN
5
0
5OOMMF:
o
oooS
.
GREEN
S o m e C o m m o n l yU s e d S i z e s o ( C o n d e n s e r s
MMF,
10
50
100
250
500
1000
3000
10,000
MF.
.00001
.00005
.0001
.00025
.0005
.00r
.003
.01
FIRST DOT
Brown
Green
Brown
Red
Green
Brown
Orange
Brown
SECOND DOT
Black
Black
Black
Green
Black
Black
Black
Black
-2%,
green- 57o, etc.
The tolerance rating corresPonds t o t h e c o l o r c o d e , i . e . , r e d
Orange dot The voltage rating corresPonds to the code multiplied by I00. Example:
Blue - 600 volt rating.
THIRD DOT
Black
Black
Brown
Brown
Brown
Red
Red
Orange
300 volt rating;
I
.F'
/., -'
R M A C o l o rC o d eon Transformers
POWER TRANSFORMERS PRIMARY _ BLACK
I.F. TRANSFORMERS
If
Plate Lead
Slls + Lead
Ited-B
Green - Grid
or AVC
Black-Ground
tappeat other gritl is green and
center
AUDIO
Hlrth
striped'
black
TRANSFORMERS
Blue - Plate Leaal
+ Lead
Iteal-B
on Push PulI
Plate
Brown - Other
Grid Lead
creen
L
e
a
d
Ground
BlackYeltow - Other Grid on PuBh Pull
Plste - Re'l
l'oltage
Center taP Red antl Yellow
Striped
- Ycllow
Iirllament
Rectlfler
and
Center TaP Yellow
Blue
No. 1-Green
l'llament
TaP Green
Center
Yellow
an't
No.2-Brown
Fllament
Center TaP - Brown
slate
No' 3Fltament
Center TaP-Slate
and
and
Yellow
Yellow
Soldering
joint and allow the solder to fow into it' The solder should melt
The most important thing in ,good soldering is to.heat the
tt ""tdt t" t
th.'it"".
Ueyefsg'p""ttt
from contact with the lli"t'i.if,.i-tfi;;;ith
joint.
make a firm connection with the wire
a
use only rosin core solder. Never depend on the solder to.hJldiitit"iii-ri'ttt9 -Always
file the surface lightlv while the
U"-i-tcopper)
before applying solder. To tin a.soldering r;;tii"-""Tai'i11;::*":*.
is still biight' wipe ofi excess
su'rfaie
nt.d
i,Jitit.-itt"
"iiaJt
iron is hot and then quickly apply a generous amount of rosin "or.
solder with a cloth.
Tin all four sides of the tip in this manner'
'minals that are-bard to solder to (nickel -n$!ed f it)-t1-$
tinned,
The-to terminals must be clean
ace,rr'emerth{roirglaerffi
t"H;;i'6ii.ridpip"i;tnisu*f
ucrer c rrrsrauc
pre-trn
tne surracc
alEilraElc
tiueratii. wipe off or shake ofi excesssolder'
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R e c o m m e n d e dT o o l s
File. Round and flat tYPes.
many years'
Purchase quality tools and you will enjoy and use them
pliers are
Williams
and
American Beauty soldering irons, Plomb'
recommended.
A gootl electric soldering iron (100 watt with small tip)
Long or needle nose Pliers 6".
Diagonal or side cutting pliers (5" or 6")'
An assortment of screw drivers flat and Phillips type'
S y m b o l sU s e d i n R a d i o C i r c u i t s
I
+
CHASSIS
OR GROUND
AIR CORE
COIL
--?
g
AIR CORE
TRANSFORMER
OR COIL
q
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R.F. cHoKE
4?lTf,fL
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-T
o
AT
TMAA
f
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[-
"5Ji!""3"
VARIABLE
RESISTOR OR
POTENTIOMETER
rrxeo
coNDENSER
CONNECTION
OF TWO WIRES
NO
CONNECTION
\
o
o \
o
ROTARY
SWITCH
o
tuuj<
.-./
I
l( :
PILOT
LIGHT
Jvl :
PLA'r'I'
suPPr<\isu2G\
g?#-\^v\'\A A
\\ scREEN
GRIDff ffi-
--bsry
.
l-lJt
METER
nlX?*t
|
CATHODE\I
-,,-f
FUSE
..-+.a.:*-:}?-..:.'-"-'pro'ffE*SPEAKER
',i'lR$"3Ril'"*
TMAMAT
I
SWITCH
-rrrTTTmL- cHoKE...
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ouARTz
ELECTROLYTIC
CONDENSER
SHOWING POLARITY
FILTER OR
IRON CORE
:
I
VARIABLE
CONDENSER
ANTENNA
oR AERIAL
V
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-'rt
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1'ooo'ooo
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oHM.
ArrE N'r
MICROFARAD
:
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En
PLUG
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T I { EH E A T HC O M P A N Y . B E N T O NH A R B O R .M, I C H '
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