Beam tetrode 69C A(1)
Hivac AC/Z Harries beam tetrode
Beam tetrode, Osram KT74
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)
