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Shuguang Hifi Series 5U4G(523P)
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Shuguang Hifi Series 5U4G(523P)

China Shuguang 5U4G.
5U4G is glass- shell eight- feet directly heated full-wave rectifier tube，5U4G is very similar with 274B and 5Z3P, which can be replaced by each other.