File talk:6P1P trio.JPG
Appearance
the right one is a "Shuguang" brand 6P1 from Shuguang Vacuum Tube factory in Hunan province, which is not a "Beijing" brand from Beijing Vacuum Tube factory.
the right one is a "Shuguang" brand 6P1 from Shuguang Vacuum Tube factory in Hunan province, which is not a "Beijing" brand from Beijing Vacuum Tube factory.