上海万里无线电厂GB-9B电子管毫伏表，每台100元不含邮
内部变压器是上海无线电二十七厂的DB-21-169，输入220V 输出255V-0V-255V 20MA 6.3V 0.6A 6.3V 0.7A6.3V 0.4A ，内部电子管为4只6J1，一只6Z4，1只6H2，管子成色都很新，可以正常通电使用，但是不确定准不准。https://img.alicdn.com/imgextra/i4/167042845/TB2eZOScq9I.eBjy0FeXXXqwFXa_!!167042845.jpg
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