"Kokumin-gata" Radio Approved by NHK
1945-48


CONTENTS

The announcement of Kokumin-gata receiver
Amennent of te standard of Kokumin-gata receiver
Post war approved system by NHK
The list of Approval Radio (Post War) (UPDATED)
DOCUMENTS

NOTICE:
Gothic is latest updates.
When not mentioned specially, all prices are original retail price.
Japanese terms or company names that is untranslatable are shown in Italics.

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The announcement of Kokumin-gata Receiver

 In 09/1945, Radio industry, METI, The Ministry of Posts and Telecommunications, NHK, were gathered and discussed about post war radio.
In 12/1945, The specifications of standard receiver (preliminary version) was appeared on the radio magazine.
It named “Kokumin-gata“ radio. “Kokumin” means “national”.

On the first standard, old-fashioned regenerative set (0-V-2) was deleted.
Heater voltage changed from 2.5V into 6.3V. Circuit was 4 tubes TRF (1-V-1) only.
However, the supply of new tubes was limited.
The standard ended up with including old-fashioned circuit and tubes.
In 1946, First editions of the standard of Kokumin-gata receiver was announced from Communication Equipment Manufacturer’s Association (CEMA)

Type TUBES Output Speaker Note Price
(12/1946)
Price
(02/1947)
No.1 12Y-V1 12Y-R1 - 12Z-P1 24Z-K2 300mW> magnetic Transformer-less JPY 600 2,016
No2-A 6D6 6C6 6Z-P1 12F 300mW> magnetic JPY 600 1,991
No.2-B 12Y-V1 12Y-R1 - 12Z-P1 12F 300mW> magnetic JPY 600 unknown
No.2-C 6D6 6C6 42 12F 300mW> magnetic ----- 2,016
No.3 12Y-V1 12Y-R1 - 12Z-P1 24Z-K2 300mW> dynamic Transformer-less JPY 1,025 unknown
No.4 6D6 6C6 42 12F 1W> dynamic Early Plan ----- 2,728
No.4-A 6D6 6C6 42 80 1W> dynamic JPY 1,025 unknown
No.4-B 6D6 6C6 6Z-P1 12F 300mW> dynamic JPY 1,025 unknown
No.5 57A 56A 12A 12F 170mW> magnetic JPY 402 1,436
No.6-A 58A 57A 47B 12F 300mW> magnetic JPY 582 2,004
No.6-B 58A 57A 3Y-P1 12F 300mW> magnetic ----- 2,034

Price is official price (28/2/1947)

No.1 was Transformer less set equal to Housoukyoku-gata type No.123 receiver.
No.3 was Transformer less set with dynamic speaker.
No.5 was old-fashioned Nami-Yon radio used 2.5V tubes.
No.6 was TRF set used 2.5V tubes.
Most popular set was No.2-A that was TRF used 6.3V tube and magnetic speaker.
No.4 was high grade TRF with dynamic speaker.

Some model used auto-transformer to reduce the size of transformer.
This type called “single” type.
The primary winding of transformer connected to chassis, the caution for electrical shock needed.

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Amendment of the standard of Kokumin-gata receiver

 In 1947 CEMA reexamined the standard. New standard was established as CES-12 “Regular class Kokumin-gata Receiver”.
At 06/1947, Regenerative No.5 receiver was prohibited by GHQ to avoid interference.
Old fashioned No.6 receiver was discontinued.
Irregular No.2-B and No.2-C were discontinued.

 Kokumin-gata Receiver was arranged 5 types.
Alternate usage of tubes allowed (i.e. 6C6 instead of 6D6, Se rectifier instead of 12F).
The standard for regular class was issued first.
At 16/09/1947, CEMA authorized the standard of “Super Class” Kokumin-gata Receiver as upper class of TRF Kokumin-gata Receiver.
This standard established technical standard of Japanese super heterodyne radio.

Type TUBES Output Speaker Note
No.1 12Y-V1 12Y-R1 - 12Z-P1 24Z-K2 300mW> magnetic Transformer-less
No.2 6D6 6C6 6Z-P1 12F 300mW> magnetic
No.3 12Y-V1 12Y-R1 - 12Z-P1 24Z-K2 300mW> dynamic Transformer-less
No.4-A 6D6 6C6 42 80 1W> dynamic
No.4-B 6D6 6C6 6Z-P1 12F 300mW> dynamic

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Post war approved system by NHK

 Approval system for radio and parts by NHK continued after the end of WWII.
The scope of approval was mainly Kokumin-gata receiver.
Kokumin-gata receiver was authorized as standard receiver by The Ministry of Posts and Telecommunications.
Exemption of commodity tax for approved Kokumin-gata receiver was recognized.
METI gave high priority of assignment of materials to approved radio.
The approval needed to participate in the shipment test by CEMA .
Then many approved Kokumin-gata receiver put on the market .

 Such privilege needed to approved by NHK was criticized.
After the dissolution of CEMA , Japanese Ministry, GHQ and radio industry discussed.
The result was that the type examination for radio set by The Ministry of Telecommunications started from 1948.
The approval for radio set was stopped after 1948.
The approval for parts continued until 1950.

Approval was only accepted in Tokyo until 1946.
By the deterioration of traffic and communication, approval was held in Osaka.
The approval number issued in Osaka started from 11611.

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The list of Approved Kokumin-gata Radio (Post War)

Model number links to full detailed failes (Bold character is newest updated)

No. Photo Brand Type Model Manufacturer Note Price(JPY) Date Type Tubes
TOKYO
11134 Sun Light No.4 TTB-42 Hitachi Ltd. First Approval at post War Contrlled Price 22/07/46 TRF 6D6-6C6-42-80
11135
11136 OKI No.4-B 46-N-1 Oki Electric Co., Ltd. Contrlled Price 14/08/46 TRF 6D6-6C6-42-12F
11137
11138 Tom No.2 11 Tokyo Musen Denki K.K. Contrlled Price 14/08/46 TRF 6D6-6C6-42/6ZP1-12F
11139
11140 TELEVIAN No.6 13 Yamanaka Electric Co., Ltd. Contrlled Price 11/09/46 TRF 58A-57A-47B-12F
11141 Alpha No.2 A100 Anritsu Electric Co., Ltd. Contrlled Price 01/10/46 TRF 6D6-6C6-6ZP1-12F
11142
11143 Clarion No.1 Ohda 2
type123
Teikoku Dempa Co., Ltd.. Contrlled Price 04/10/46 TRF 12YV1-12YR1-12ZP1-24ZK2-B37
11144
11145 TELEVIAN No.1 Kokumin-gata Yamanaka Electric Co., Ltd. Contrlled Price 04/10/46 TRF 12YV1-12YR1-12ZP1-24ZK2-B37
11146 Totsu No.2-A TR-32 Toyo Communication Equipment Co., Ltd. Contrlled Price 11/09/46 TRF 6D6-6C6-6ZP1-12F
11147 Clarion No.2-A Kokumin-gata Teikoku Dempa Co., Ltd. Contrlled Price 27/11/46 TRF 6D6-6C6-6ZP1-12F
11148
11149
11150
11151 ELMAN No.2-A Kokumin-gata Taiyo Radio Manufacturing Co., Ltd. Contrlled Price 28/01/47 TRF 6D6-6C6-6ZP1-12F
11152
11153 ARIA No.2-A Kokumin-gata Mitaka Denki K.K. Contrlled Price 19/03/47 TRF 6D6-6C6-6ZP1-12F
11154 TELEVIAN No.5 R-10 Yamanaka Electric Co., Ltd. Contrlled Price 19/03/47 0-V-2 57-56-12A-12F
11155
11156 Nanaola No.1 Kokumin-gata Nanao Radio Co., Ltd. Contrlled Price 14/04/47 TRF 12YV1-12YR1-12ZP1-24ZK2-B37
11157
11158
11159
11160 General No.2-A Kokumin-gata Yaou Radio Manufacturing Co., Contrlled Price 16/05/47 TRF 6D6-6C6-6ZP1-12F
11161
11162 Nanaola No.2-A Kokumin-gata Nanao Radio Co., Ltd. Contrlled Price
JPY 2496.00
16/05/47 TRF 6D6-6C6-6ZP1-12F
11163 TOYOTA No.2-A K-2-C Toyota Motor Co., Kariya South Factory Contrlled Price 16/05/47 TRF 6D6-6C6-6ZP1-12F
11164 Toshiba No.1 ZS-1021 Tokyo Shibaura
Electric Co., Ltd.
Contrlled Price 16/05/47 TRF 12YV1-12YR1-12ZP1-24ZK2-B37
11165
11166
11167
11168
11169 Cherry No.4-B RA2 Fuji Keiki Co., Contrlled Price 17/06/47 TRF 6D6-6C6-6ZP1-12F
11170
11171 TELEVIAN No.2-A Kokumin-gata Yamanaka Electric Co., Ltd. Contrlled Price 17/06/47 TRF 6C6-6C6-6ZP1-12F
11172
11173
11174 Victor No.2
Single
4R-30 Victor Company of Japan Ltd. Contrlled Price 17/07/47 TRF 6D6-6C6-6ZP1-12F
11175
11176
11177 Melodina No.2-A H2-1 Ohmori Seisakusho Contrlled Price 17/07/47 TRF 6D6-6C6-6ZP1-12F
11178 Nanaola No.6 Kokumin-gata Nanao Radio Co., Ltd. Contrlled Price 17/07/47 TRF 58-57-47B-12F
11188
11189 ELMAN No.2-A
Single
Kokumin-gata Taiyo Radio Manufacturing Co., Ltd. Last in Tokyo Contrlled Price 28/12/47 TRF 6C6-6C6-6ZP1-12F
Osaka
11611 Sharp No.1 Kokumin-gata Hayakawa Electric Industry Co., Ltd. 1st in Osaka Contrlled Price 11/06/46 TRF 12YV1-12YR1-12ZP1-24ZK2-B37
11612 National No.6 4M-102
4M-108
Matsushita Electric Ind.
Co.,Ltd
. Wireless MFG. Dept.

Changed
Contrlled Price 12/06/46
26/06/47
TRF 58-57-47B-12F
11613 TEN No.4-B DR-4
DR-4A
Kawanishi Kikai Seisakusho Ltd. Contrlled Price 23/07/46
09/47?
TRF 6D6-6C6-42-12F
11614
11615 Sharp No.6 Kokumin-gata
(Renewed Model)
Hayakawa Electric Industry Co., Ltd. Contrlled Price 14/08/46
47
TRF 58-57-47B-12F
11616 DIATONE No.4-A Model 46C Mitsubishi Electric Co., Ltd. Contrlled Price 11/09/46 TRF 6D6-6C6-42-80
11617 Hermes No.2 3K The Osaka Musen Co., Ltd. Contrlled Price 11/09/46 TRF 6D6-6C6-6ZP1-12F
11618 Concertone No.2-A Kokumin-gata Tone Musen K.K. Contrlled Price 11/09/46 TRF 6D6-6C6-6ZP1-12F
11619 Futaba No.5 Kokumin-gata Futaba Electric MFG. Co., Ltd. Contrlled Price 13/12/46 0-V-2 57-56-12A-12F
11620
11621
11622
11623 Sharp No.2-B Kokumin-gata Hayakawa Electric Industry Co., Ltd. Contrlled Price 13/12/46 TRF 12YV1-12YR1-12ZP1-12F
11624 National No.6 4M-103 Matsushita Electric Ind.
Co.,Ltd.
Wireless MFG. Dept.
Contrlled Price 17/02/47 TRF 58-57-47B-12F
11625
11626
11627
11628
11629 National No.2-A 4M-106
4M-111
4M-114
Matsushita Electric Ind.
Co.,Ltd.
Wireless MFG. Dept.

Changed
Changed
Contrlled Price 16/05/47
19/02/48
28/08/48
TRF 6D6-6C6-6ZP1-12F
11630
11631
11632
11633 Concertone No.6 Kokumin-gata Tone Musen K.K. Contrlled Price 25/09/47 TRF 58-57-47B-12F
11634 Futaba No.2-A
Single
Kokumin-gata Futaba Electric MFG. Co., Ltd. Contrlled Price 18/12/47 TRF 6D6-6C6-6ZP1-12F
11635 Futaba No.4-B
Single
Kokumin-gata Futaba Electric MFG. Co., Ltd. Contrlled Price 18/12/47 TRF 6D6-6C6-6ZP1-12F
11636 Futaba No.6-B
Single
Kokumin-gata Futaba Electric MFG. Co., Ltd. Last in Osaka Contrlled Price 18/12/47 TRF 58-57-3YP1-12F

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DOCUMENTS

Denpa Kagaku (Radio Technic & Science) 02/1947 published by Nippon Housou Shuppan Kyokai
Denpa Kagaku (Radio Technic & Science) 07/1947 published by Nippon Housou Shuppan Kyokai
Musen to Jikken (Radio Experimenter's Magazine) 07/1948, 08/1948 published by Seibundo Shinkosha Ltd. 

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