English: This is a picture taken by myself of two different kinds of phototubes, one RCA 918 on the left and a Cetron 1P40 on the right. This is entirely my own work.
2011-06-09 02:34 Grinevitski 4320×3240× (5552613 bytes) This is a picture taken by myself of two different kinds of phototubes, one RCA 918 on the left and a Cetron 1P40 on the right. This is entirely my own work.
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