Pinched Tip
KT66
TT21
B339, ECC83, I61
CV2901
U52
ECC82, B329
CV1075
TT22
B65
Common alternate designations for ECC83. Always confirm heater, plate dissipation, and pinout against a datasheet before substituting.
12AX7
ECC83, 12AX7A
12AX7A, ECC83, 7025
ECC83, 12AX7, MC0
ECC83
ECC83, 12AX7, I63
ECC83, MC6
ECC83, MCA
ECC83, MC1