Pair tube direct heat triode made in China Measured value 66/64 (critical value 38) with white box ※ The pair is determined based on the GM value measured by the tester TV-7 (Yosuke Kojima)
Accessories: white box
Pair tube (checked on tester TV-7) with 311A equivalent ball source box. Measured value 48,48/30 (critical value) *The pair is judged based on the GM value measured by the tester TV-7.
1 sold tea base British logo has disappeared, but it seems to be made by GEC from the structure Measurements 66 (rejection value 44) side getter with white box is reduced, it is a bargain because there is a lot of burning ※ Measurements are The gm value measured by the tv-7 test machine is indicated (Yosuke Kojima)
Accessories: white box
All of the 6CA7 compatible ball prints on the pair tube have disappeared, but it seems that they are made of RFT from the structure. Measured value 44/44 (rejection value 30) foreign matter stays in the tube on one side with the original box (made by SIEMENS), and there is slight getter burn, so it's cheap ※The pair is determined based on the GM value measured with the test machine TV-7 (Kojima Yosuke)
Accessories: original box
1 bottle sold direct heat triode rice ball type top mica, WE reprint type print that employs a fishing rod type filament is rubbed and is almost invisible, but it seems to be 300B made by Svetlana from the structure measured value 76 (rejected area 58) with replacement box*The measured value is the gm value measured by the testing machine TV-7 (Yosuke Kojima)
Accessories: Alternative box