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Beam tetrode, Radiotron 6L6

Beam tetrode 69C A(1)

Beam tetrode, Osram KT74

Hivac AC/Z Harries beam tetrode

Beam tetrode, Sylvania 6V6GT

Beam tetrode, Mullard (Canada) QVO5-25

Beam tetrode, Osram KT66

Beam tetrode, Mullard QVO4-7

Beam tetrode 83 (xx)

Beam tetrode, Sylvania 7C5

Beam tetrode, patent tube No. 1A(1)

Beam tetrode, Osram KT76

Beam Tetrode. 48 (1)

Beam tetrode, P.T. 76A(1), Western Electric 350-B