12AB5
12AL5 SYLDuo diode (similar to 6AL5 except for heater)
12AT7ECC81High-mu twin triode
12AU6
12AU7ECC82jjMedium-mu twin triode
12AV6 GETwin diode/High-mu triode (see also: 6AV6)
12AV7Dual Triode
12AV75965Dual Triode
12AX7ECC83High-mu twin triode
12AX7 WA7025High-mu twin triode
12B4A
12BA6HF93Remote cutoff pentode (See also: 6BA6)
12BA7
12BE6HK90Pentagrid converter (See also: 6BE6)
12BH7Dual Triode
12BY7 AVideo Amplifier Pentode
12BZ7 CBS
12S7UAF42
12SA7Pentagrid converter (Octal version of 12BE6)
12SG7
12SJ7
12SL7
12SN7
12SQ7 GLDual diode, triode (Octal version of 12AV6)