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12AX7/12AX7B/7025/ECC83/B339
12AU7/ECC82/CV491/B329
12AT7/ECC81/CV455/B309
6SL7GT/6N9P/ECC33
6SN7GT/6N8P
6P14/EL84/6BQ5
KT88/KT88-98/CV5220
KT94
KT100/KT100A
EL34/EL34B/6CA7
EL156
6550/6550A-98
6L6GC/6L6GCR/6P3P/5881/6L6WGB
350B/350C
6V6GT/6P6P
300B/300B98/300BA/300BC/300BS
2A3
211/VT4C
845/845B/845C
5AR4/GZ34
5U4G/5Z3P/5Z3PA
572B
5Z4P/GZ32/5Z4
6Z5P/6X5
6Z4
6N13P/6N5P/6AS7G/6080
FU811/811A
FU812/812A
FU813/813A
FU5/805
FU7/807
Fu-46/6146B
50CA,6LF6 ,6N1,6K4,6J1,6J4,6A2,6E2,6P1,6N7P,6J8P,6P17P,6J4P
6A7P 
 

12AX7B-7025
Main parameter1
300B-98 : Basic type,Price cheapness
300BA: Grid of gold, voice quantity good
300BC: All graphites hold the pole, the power is big
300BS-B : The eggplant shape, mesh plate， the graphite of the black holds plate, the spring coil slice mourns the hook, the quality is high．
300BS-C: The eggplant shape, mesh plate， the Metals tai plate, the spring coil slice mourns the hook, the quality is high.
12AX7： Basic type
12AX7B: Choose specially of, low noise tubes
EL34: 　Basic type
EL34B: 　 The model number of the improvement, stability, dependable sex exaltation