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2A6- First year: 1933
- Base: 6-Pin-Base U6A, ol
- Filament: Vf 2.5 Volts / If:
- Identical to: = PH2A6 = UZ2A6 =
- Tube type: Double Diode-Triod
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2A7- First year: 1933
- Base: 7-Pin-Base U7A = s
- Filament: Vf 2.5 Volts / I
- Identical to: 2A7 = PH2A7 = Ut-2
- Tube type: Pentagrid-Converte
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2B7- First year: 1933
- Base: 7-Pin-Base U7A =
- Filament: Vf 2.5 Volts / I
- Identical to: 2B7 = PH2B7 = Ut2B
- Tube type: Double Diode-Pento
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2D41- Base: British-7-Pin, old
- Identical to: 2D41
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30- First year: 1930
- Base: UX-Base (4 Pins (2
- Filament: Vf 2 Volts / If 0.
- Identical to: 30 = VT-27 = 230 =
- Tube type: Triode, vacuum U
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31- First year: 1930
- Base: UX-Base (4 Pins (2
- Filament: Vf 2 Volts / If 0.
- Identical to: 31 = 131 = VT-31 =
- Tube type: Triode, vacuum P
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32- First year: 1927
- Base: UX-Base (4 Pins (2
- Filament: Vf 15 Volts / Half
- Tube type: Triode, vacuum A
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33- First year: 1931
- Base: UY-Base, 5 Pins (U
- Filament: Vf 2 Volts / If 0.
- Identical to: 33 = 133 = UY-33_J
- Tube type: Vacuum Pentode P
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34- First year: 1930
- Base: UX-Base (4 Pins (2
- Filament: Vf 2 Volts / If 0.
- Identical to: 34 = VT-54 = UX-34
- Tube type: Screen-grid Tetr
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35- First year: 1931
- Base: UY-Base, 5 Pins (U
- Filament: Vf 2.5 Volts / If
- Identical to: 35 = 35/51 = 235 =
- Tube type: Screen-grid Tetrod
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