Radio Sets Approved by Nippon Hoso Kyokai (Pre War)
1934-43


CONTENTS

Recommendatory System of Wireless Apparatus
System and Registration Number
approval and recommendation System at War Time

The List of Approved Radio (Pre War) (UPDATED)

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Recommendatory System of Wireless Apparatus

 Broadcasting station needed prevailing low cost and high quality radio.
However, low cost radio sets manufactured by small factory did not have enough quality.
To prevail the high quality set and parts, approval and recommendation system for radio and radio parts started from 1928 by Nippon Hoso Kyokai (The Broadcasting Corporation of Japan).

 According to the rule of the system, radio set or component parts manufactured by general manufacturers were to obtain the approval and recommendation of the broadcasting authorities before put on the market. Before giving approval and recommendation, the broadcasting authorities were to test the qualities, construction and other specifications of radio set and component parts in conformity with rules.
Manufacturers were also required to be able to produce goods of the same quality at proper prices and their productive power was, too, taken into consideration before obtaining the approval from the broadcasting authorities.

Technical standard was suitable for crystal and battery set.
In 1934, recommendatory system of wireless apparatus was revised for new AC set.
The system of approval and recommendation applies to only low cost set and parts (tube, transformer, speaker, capacitor etc).

 Since 1934, Approved radio and parts increased well. However, This approved system was not mandatory.
The greater part of Japanese radios was not approved.
To certify this system, high specifications and quality was demand. The cost of approved radio was increased.
To avoid high cost, many “using approved parts” radios put on the market.
These radios used one or two important approved parts such as power transformer or speaker.

 Approved radio did not prevailed. Most of reason was high price.
The price of approved radio was twice as high as cheapest set.
The poor quality radio sold for popular conmsumption.
The qualities of cheap radios were very poor. Such radios sometimes failed and caused interference.

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 System and Registration Number

 The system of approval and recommendation was certification for submitted sample. Test sample kept by Nippon Hoso Kyokai. If the sample passed test, approved number was given to manufacturer. They could indicate approval and recommendatory mark on their products and advertisement.

Approved number consists of 5 digits of numbers.
First 2 digits means types of radio and parts, Last 3 digits means registration number start from 011.

  "recommendatory Mark" of Nippon Hoso Kyokai

Certification Number (except for radio parts)

No. Type of Radio Note
11*** AC Set (with Speaker)
12*** AC Set (without Speaker)
13*** Amplifier with Radio for School from 1946
15*** AC Set (Chassis only)
16*** DC or AC/DC Set

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approval and recommendation System at War Time

   In 1938, Nippon Hoso Kyokai started Hosokyoku-gata Radio”.
This is standardized radio. At the technical standard of “Hosokyoku-gata” radio, Approved parts used mandatory.
Nippon Hoso Kyokai became recommend their Hosokyoku-gata radio first.
Other approved radio became second choice.
From April 1st 1938, The approval and recommendationof radio set that has equivalent specification to Hosokyoku-gata radio was stopped.

 At the war time, the price and supply of radio was controlled.
Hi-end radio such as superheterodyne receiver was official use only.
The official use hi-end radio was limited to approved set.
Expensive hi-end set added to approval and recommendation system.
From 1939, approval and recommendation of radio decreased. Last approved radio was listied in 1943.

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The List of Approved Radio (Pre War)

Without notice, Speaker is magnetic, Frequency range is 550-1500kc AM only.

(Bold character is newest updated)

No. Photo Brand Model Manufacturer Note Price(JPY) Date Type Tubes
11011 Hudson 32 Yukawa Denki Seisakusho Switched from old approval 30.00 10/31 0-V-1 227-112A-112B
11012           Switched from old approval        
11013           Switched from old approval        
11014     Nanaola  70  Nanao Radio Co., Ltd  Switched from old approval 37.00   32 or 33 0-V-1   227-112A-112B
11024 Crown 424 The Nihon Seiki Co., Ltd 35.00 07/35 TRF 24B-24B-47B-12B
11026 Crown 347 The Nihon Seiki Co., Ltd. 26.00 13/09/35 0-V-1 24B-47B-12B
11036 Aria Meirou-go A/B
R-12
Seinen 2 D
Mitaka Denki Seisakusho 27.00

23/12/35

37
0-V-2 227-226-112A-112B

27A-26B-12A-12B
11039 Hermes P4 "Gondra"
P4 "Stage"
Osaka Transformer Co.,Ltd. 53.00
50.00
28/12/35 TRF 24B-24B-47B-12B
11044 Crown 412 A The Nihon Seiki Co., Ltd. 26.00 20/04/36 0-V-2 27A-26B-12A-12B
11045 Televian M48 A
M48 B(EC-28)
Seinen-dan 4 A
Yamanaka Electric Co., Ltd. 39.5.15discontinued
38.5.15change model name
49.50
57.00
20/04/36
24/08/38
TRF 24B-24B-47B-12B
11047 Aria 470 A/B/C
Seinen 4 B
J300
Mitaka Denki K.K.
Addition
Addition
invalitation
50.00

75.00
27/05/36
37?
20/05/38
25/05/39
TRF 24B-24B-47B-12B
11048 Aria
Aria
Okada
Perry
Jyosai
100
R1
JR16
M60
No.1
Mitaka Denki K.K. Mitaka Denki K.K.
Mitaka Denki K.K.
Okada Shoten
Imamura Denki K.K.
Jyosai Radio-sho Kumiai
31.00
34.00
27.50
27.50
27.50
27/05/36 0-V-2 27A-26B-12A-12B
11050 Nanaola 85
Nanao Radio Co., Ltd.
Specification change.
52.80
20/06/36
24/08/38
TRF 24B-24B-47B-12B
11054 Sharp 48
55
Hayakawa Metal Works 48.00
50.00
20/06/36 TRF 24B-24B-47B-12B
11059 Takachiho 303 Houden Company 550-1400kc 26.00 20/06/36 0-V-2 27A-26B-12A-12B
11066 National K-5 Matsushita Radio MFG Co., Ltd. 27.00 30/09/36 0-V-1 24B-47B-12B
11071 Ergo 300 Kimura Denki K.K. 36.12.23Revocation by Violation
28.00
12/11/36 0-V-1 57-47B-12B
 11072    Concertone RM24
type 1/2/3
Tiger Electric Co.   30.00 12/10/36 0-V-1  24B-26B-12A-12B
11080 Televian      Kumaden
M4B5  Toho
Yamanaka Electric Co., Ltd. 25.00 15/02/37 0-V-2 27A-26B-12A-12B
11086 National

Sister
R-48

S-480
Matsushita Radio MFG Co., Ltd.
Specification change.
Price change
Addition

Discontinued
50.00

62.00
48.00
17/06/37
02/11/37
16/08/38
28/01/38

05/06/39
TRF 24B-24B-47B-12B
          12F
11091                   
11092 Hermes 24M
24F
 24F to 24H
 24M to 24R
 24R Price change
 24R to 25R
 25R Price change
Osaka Transformer Co.,Ltd.



price change
32.00

35.00

35.00

43.00
17/07/37

25/11/37
unknown
20/05/38
22/08/38
22/09/38
0-V-2 24B-26B-12A-12B
Changed from 12B into 12F
11099                   
11100 Nanaola 50 A
50 B
Nanao Radio Co., Ltd.
Price change
27.00
33.00
11/12/37
24/02/38
0-V-2 56-26B-12A-12B
Changed from 12B into 12F
(date: unknown)
11101     Sharp 57
58
58B
Hayakawa Metal Works Co.,  
Price change
Price change
Price change
50.00
55.00
60.00
67.00 
11/12/37
07/03/38
27/10/38
01/06/39
 TRF  24B-24B-47B-12B
11102                   
11103 Concertone M5 Tiger Electric Co. Circuit & parts changed
Price change
45.00

62.00
27/12/37

14/09/38
TRF 24B-26B-12A-12B
Changed from 12B into 12F
(date: unknown)
11104                   
11105    Sister
National
S-360
K-360
 Matsushita Radio MFG Co., Ltd.  

Price change
Expired
33.00

45.00 
 33. 2.16

38.8.24
40.3.31
0-V-2   24B-26B-12A-12B
11106 Crown 480 The Nihon Seiki Co., Ltd.
Price change
31.00
39.00
12/03/38
20/07/38
0-V-2 24B-26B-12A-12B
11107                   
11108                   
11109                   
11110                   
11111 Televian M4C5
EC25
Toho 2
Kumaden 38
Yamanaka Electric Co., Ltd.
Price change
30.00
40.00
08/04/38
24/08/38
0-V-2 24B-26B-12A-12F
11112                   
11113 Nanaola 75 A
75 B
Nanao Radio Co., Ltd.
Price change
33.00
37.50
11/05/38
24/08/38
0-V-2 24B-26B-12A-12F
11118 Victor R-101

5R-10
Victor Talking Machine Co., of Japan
Price change
Cabinet & model name changed
Price change
Price change
75.00
80.00
87.00
98.00
108.00
13/06/38
10/38
23/12/38
28/04/39
31/07/41
TRF 58-24B-24B-2A5-80
11123     Televian D14
E4
E11
 Yamanaka Electric Co., Ltd.

D14,E4->E11
Price change
Expired
 66.00
75.00

78.00
 30/06/38
24/08/38
07/02/39
08/05/39
30/09/40
TRF   58-57-47B-12F
11124 Victor R122(JR-122) Victor Talking Machine Co., of Japan
Price change
Price change
97.50
130.00
140.00
10/08/38
16/08/38
12/10/38
Super 58-2A7-58-2A6-2A5-80
11128 Victor 4R-10 Victor Talking Machine Co., of Japan) Dynamic speaker 78.00 09/10/39 TRF 58-57-47B-12F
11129 Victor 6R-70 Victor Talking Machine Co., of Japan 185.00 09/10/39 Super 58-2A7-58-2A6-2A5-80
11130 Victor 5R-70 Victor Talking Machine Co., of Japan 155.00 06/03/1940 Super 58-2A7-57-2A5-80
11131 Victor

6R-75

6R-80
Victor Talking Machine Co., of Japan


Cabinet & model changed
Expiry date extended
207.00

31/03/40
42?
31/03/44
Super 58-2A7-58-2A6-2A5-80
11132 National Kokumin 7 Matsushita Radio MFG Co., Ltd. 171.80 11/12/42 Super 58-2A7-58-2A6-2A5-80
11133 Hermes KS-6 Osaka Musen Co., Ltd. Last Approved until 1945 171.80 31/03/43 Super 58-2A7-58-2A6-2A5-80

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