Amperex, Mullard, Philips, and Valvo Tube Codes.

安普雷斯，大盾，飞利浦公司和富豪管码。

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Prior to 1955, Mullard used a purely numerical code for encoding the tube type, but then adopted the code change as listed here after that.

到1955年之前，大盾用于编码管式纯数字代码，但随后通过代码改变之后，列在这里。

youdao

Prior to 1955, Mullard used a purely numerical code for encoding the tube type, but then adopted the code change as listed here after that.

到1955年之前，大盾用于编码管式纯数字代码，但随后通过代码改变之后，列在这里。

youdao