9-Pin Triodes
12AT7 / ECC81
12AT7 – RCA / 12AT7 – GE / ECC81 – Phillips
12AU7 / ECC82
12AU7-A – RCA / 12AU7A, 12AU7, 7AU7 – GE / ECC82, 12AU7 – Mullard
12AX7 / ECC83
12AX7 – GE / 12AX7-A – RCA / ECC83S – 12AX7, 7025 – JJ
Beam Tetrode
6L6GC
6L6-GC – RCA / 6L6GC – Tung-Sol / SV6L6GC – Svetlana
Kinkless
KT66 – G.E.C. / KT66 – Genalex / KT66 – JJ
KT88 – Svetlana / KT88 – Genalex / KT88 – JJ
6550 – Tung-Sol / 6550 – RCA / 6550 – JJ
Pentode
EL34/6CA7
EL34 – Mullard / EL34, E34L – JJ / EL34/6CA7 – Svetlana