It was determined that the pair tube was made of RFT from the 6CA7 compatible sphere structure. Measured value 44/42 (rejected value 30) with original box, all printing on one side has disappeared, and the other side also has a lot of printing loss, so it's cheap. A sticker with the model number printed on it is attached to the base ※The pair is determined based on the gM value measured by the testing machine TV-7 (Kojima Yosuke)