SM6T22A 超小型管 SM6T22A-E3/52 SM6T22A-E3/5B SM6T22AHE3/52 SM6T22AHE3/5B SM6T22AHE3_A/H SM6T22AHE3_A/I SM6T22AHE3_B/H SM6T22AHE3_B/I SM6T22AHM3/H