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- Dec 23, 2008
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This is a brand new 543nm HENE tube i just bought for 100usd. No power supply.
notice the center tube is opaque. on my red it is crystal clear. is this normal? not on the spec sheet that light exits from the cathode end too.
notice the center tube is opaque. on my red it is crystal clear. is this normal? not on the spec sheet that light exits from the cathode end too.