Yannan Zhang's Personal Page
I enjoy collecting all kinds of electronic things, especially chips, transistors, diodes, vacuum tubes and instruments. Some of my collections have witnessed the development of our country’s electronic industry, even a small diode emits the scent of history.
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3AX61
3AX61 is a germanium PNP mid-power transistor. It is made in 1975, Suzhou, China.

3DG130
3DG130 is a silicon NPN mid-power transistor. It is made in 1989. In the past, this model of bipolar transistor were often used in radio and audio amplifier.

3AG53B
3AG53B is a germanium PNP small-power transistor. It is made in Taiyuan, China.

3AD14D
3AD14D is a germanium PNP large-power transistor. It is made in 1983, Taizhou, China.

3DG142C
3DG142C is a silicon NPN low-power transistor. It is made in 1987, Shandong, China


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