放送協会認定受信機写真
Approved Radio by NHK

放11164号　東芝ZS-1021型　国民型1号　東京芝浦電気(株)　(1947.5.30認定)

Approved No. 11164 Toshiba Model ZS-1021 Type Kokumin-gata No.1 Tokyo SHibaura Electric Co., Ltd.. Approved at 30/05/1947

　　

　　
　ダイヤルの色が異なるバリエーション　　

TUBES: 12YV1-12YR1-12ZP1-24ZK2-B37, Transformer-less, TRF, Magnetic Speaker (Paper Framed)

戦後、ラジオセットの生産に本格的に参入した東芝の初期の製品。局型123号をベースとする国民型1号だが、局型より小型化されている。コイルは局型と異なり、ハイインピーダンス型のコアつきのものが使われ、小型のためシャーシ下に取り付けられている。真空管のコストが高く、戦後特に悪化していた電力事情の下では電圧低下に弱い国民型1号受信機は発売された機種が13機種と少なかった。ダイヤルの色が黄色と青色のバリエーションが確認されている。

Toshiba came back to production of radio set after the war.
A few Toshiba radio in early 1940’s was OEM supplied products.
After the war, they produced radio set at own factory.
Model ZS-1021 was one of the Toshiba’s early products.
Circuit equaled Housoukyoku-gata No.123 transformer-less TRF set.
Housoukyoku-gata type No.123 receiver changed into “Kokumin-gata” No.1 receiver in 1946.
This set used small sized high impedance type RF coil with core.(This example had anoriginal coil)

However, the quality of power line was very poor. Voltage was not stabilized.
Transformer-less receiver was lack of sensitivity by low voltage.
And failure often caused by high voltage. Reliability was lower than conventional radio sets with power transformer.
The price of tubes for transformer-less receiver was expensive and production was limited.
13 models of Kokumin-gata No.1 receiver were produced. However these radios did not prevailed.

(Collection No.11610/11857)

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