Radio Broadcast (May 1929-Apr 1930)
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~2L
RADIO BROADCAST.
Table 1 — Tabulation of Parts Made and Purchased by Manufacturers Covered by Survey
Manufacturer » >
1
2
3
4
5
6
7
8
9
10
11
12
13
14
K
CD
a
0
G
V
Part
J
Purch as
Make
Purchas
Make
Purch at
Make
Purchat
Make
a JS
u
s
Make
a
ja
e
3
Make
Purchas
Make
Purchae
Make
Purcha*
Make
Purcha;
Make
Purchat
Make
Purchaf
Make
Purchas
Make
Purchat
Make
Filter Condensers
X
X
X
X
X
—
X
X
X
X
X
X
X
X
X
X
Variable C Condensers
X
X
X
X
X
X
—
X
X
X
X
X
X
X
X
By— pass Condensers
X
X
X
X
X
—
X
X
X
X
X
X
X
X
X
V
A. F. Transformers
X
X
X
X
—
X
X
X
X
X
X
X
X
X
X
Power Transformers
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Filter Choke Coils
X
X
X
X
X
X
X
X
X
X
X
X
X
X
R. F. Choke Coils
X
X
X
X
X
X
X
X
X
X
X
X
X
X
It. F. Tuning Coils
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Fixed Resistances
X
X
X
X
X
X
x
X
X
X
X
X
X
X
X
X
X
Variable Resistances
X
X
X
X
x
—
X
X
X
X
X
X
X
X
X
Tube Sockets
X
X
X
X
—
X
—
X
X
X
X
X
X
X
X
X
X
Metal Chassis
X
X
X
X
—
X
—
X
X
X
X
X
X
X
X
X
Dials and Assemblies
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Shields
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Loud Speakers
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Tubes
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Cabinets
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Total
8
10
16
1
4
11
7
12
6
14
5
13
8
12
6
12
8
9
9
8
5
12
2
16
5
14
6
12
purchase from outside companies the large high-wattage resistors such as the output voltage divider in the platesupply unit. Many manufacturers evidently make their own metal cabinets but purchase the wooden cabinets.
The totals at the bottom of Table I show the number of parts the various companies purchase and make. In Table II these totals have been converted into percentages. Table II, therefore, shows the percentage of parts purchased and the percentage of parts made in the case of each manufacturer. From these figures we arrive at the average percentages given at the bottom of Table II.
Table III gives the per
Table II
Percentage of Parts
Manufacturer
Bought
Made
1
45
55
2
94
6
3
22
78
4
37
63
5
30
70
6
28
72
7
40
60
8
33
67
9
47
53
10
53
47
11
29
71
12
11
89
13
26
74
14
33
67
Average
38
62
100 90
O70 £ 60
y 50
£40|
a 30 20 10 0
iii'Iliil iBi ■■■ I I I I I
1
ililiiii
■ ■ ■ ■
AVERAGE MADE
AVERAGE BOUGHT
5 6 7 8 9 10 MANUFACTURERS
11 12 13 14
The data of Table II in graph form. Black bars indicate percentage of parts bought.
centage of manufacturers who either purchase or buy the various parts, indicating thereby which parts are most generally made and which are generally purchased. For example, filter condensers are purchased by 36 per cent., made by 57 per cent., and partially made and partially purchased by 7 per cent. Dials are made by 86 per cent, of the manufacturers, only 7 per cent, purchased all their requirements of this item from the outside, and 7 per cent, make some dials and purchase the remainder of their requirements. To indicate in numerical order those parts most generally made by manufacturers we (Continued on page 238)
Table III
Percentage of Manufactures who
Table IV
Part
Purchase
Make
Both pure he
the part
the part
make the
Filter Condensers
36
57
7
Variable Condensers
36
50
14
By-pass Condensers
50
43
7
A. F. Transformers
14
86
0
Power Transformers
29
71
0
Filter Choke Coils
29
71
0
R. F. Choke Coils
7
93
0
R. F. Tuning Coils
0
100
0
Fixed Resistances
57
14
29
Variable Resistances
64
36
0
Tube Sockets
29
64
7
Metal Chassis
14
86
0
Dials and Assemblies
7
86
7
Shields
21
71
7
Loud Speakers
29
64
7
Tubes
86
14
0
Cabinets
57
14
29
R. F. Tuning Coils R. F. Choke Coils Metal Chassis Dials and Assemblies A. F. Transformers Power Transformers Filter Chokes Shields Tube Sockets Loud Speakers Filter Condensers Variable Condensers By-pass Condensers Variable Resistors Fixed Resistors Tubes Cabinets
Percentage of Mfrs. who make them 100 93 86 86 86 71 71 71 64 64 57 50 43 36 14 14 14
AUGUST 1929
205