Pair tube, 6CA7 compatible ball, made in Russia, measured value 46/44 (rejected value 30) with white box ※Pairs are determined based on gM values measured with the test machine TV-7 (Kojima Yosuke)
Accessories: white box
Pair tube double triode tube VT-231 equivalent tube made in Russia measurement value 106/104 (rejection value 50) There is printing distortion and disappearance of the one-sided tube with the original box ※Pairs are judged based on gM values measured with the testing machine TV-7 (Kojima Yosuke)
Accessories: original box
Pair tube, double triode tube, VT-231 equivalent tube, made in Russia, measured value 114/106 (rejected value 50) *Pairs are determined based on gM values measured with the test machine TV-7 (Kojima Yosuke)
Accessories: none
Pair tube Russian metal base measurement value 56/54 (rejected value 44) lot: 1110/1110 ※Pairs are determined based on GM values measured by the testing machine TV-7 (Kojima Yosuke)
Accessories: original box