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Page 4
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CH.-\RT :\0.
1
RA!':GE
15
to
10K
CHA.RT :\0. 2 RA!\GE
15K
to
10
Me~.
S'.\
itl'il
Sw1tcil
P(1sitiun
Value
Color Code
PositJUn
Value
Color Code
15
Brown Green Black
1
15 K
Brown Green Orange
~
22
Red Red !3lack
2
22 K
Red Red
Oran~.e
.l
33
Oran~e Oran~e
Black
3
33
K
Orange Orange Orange
l
17
Yellow Vwlct Black
4
47K
Yellow Violet Oran"'e
68
Blue Grr•y 13lack
5
G8
K
Blue Grey Orange
6
100
3rown Black Brown
6
100 K
Brown 13lack Yellow
150
Brown Green Brown
7
150 K
Brown Green Yellow
8
220
Hed Red Brown
8
220
K
Red Red Yellow
9
330
Orange Orange Brown
9
330
K
Orange Orange Yellow
10
470
Yellow Violet Brown
10
470 K
Yellow Violet Yellow
11
680
Blue• Grey Brown
11
680 K
Blue Grey Yellow
12
1000
Brown Black Red
12
1 Meg.
Brown Black Green
1.3
1500
Brown Green Red
13
1
.5 Meg.
Brown Green Green
1~
2200
Red Red Red
14
2
2 Meg.
Red Red Green
15
3300
Oran~e Oran~e
Red
15
3.3
Me~.
Orange Orange Green
16
4700
Yellow Violet Red
16
4.
7
Me~.
Yellow Violet Green
17
6800
Blue Griey Red
17
6.8
Meg.
Blue Grey Green
18
10,000
Browli Black Orange
18
10
Meg.
Brown Black Blue
APPLICATIONS
In radio or television service work, the Heathkit Resistance Substitution Box will prove uf
~rcat
assistance in experimentally determinin[>; the desired value of a charred or unmarked resistor
through temporary sulJstitution.
It
can also lJe substituted for any resistor in a radio circuit so
that the value of the resistor may be changed durin.,; operation in order to determine the desired
resistance value that will provide maximum circuit performance.
No attempt will be made to
detail all of the various applications, and through continued usage many additional applications
of the Resistance Substitution Box will suggest themselves to the service man.
In laboratory or circuit development work, the Resistance SulJstitution Box will prove invalu-
able. The advantages of using several Resistance SulJstitution Boxes are obvious, as any change
in a circuit constant invariably requires a corresponding change in son1e other con1ponent.
By
having Resistance Substitution Boxes connected in the plate, gnd, cathode or screen supply cir-
cuits, the entire experimental setup can be quickly changed.
Because the Heathkit Resistance Substitution Box kit uses standard RTMA values, it is then pos-
sible to select from your workinr>: stock the exact resistor needed for any application.
The re-
sistors used are all rated at 1 watt and this rating should not be exceeded in use.
The con-
tinuous operating voltage rating of
500
volts should be observed to prevent a
flashover with-
in the unit.
~
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