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47- First year: 1931
- Base: UY-Base, 5 Pins (U
- Filament: Vf 2.5 Volts / If:
- Identical to: = P2 = 247 = PZ =
- Tube type: Vacuum Pentode P
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485- First year: 1930
- Base: UY-Base, 5 Pins (U
- Filament: Vf 3 Volts / If 1.
- Identical to: 485
- Tube type: Triode, vacuum
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506- First year: 1927
- Base: Europe 4-Pin (A, 4
- Filament: Vf 4 Volts / If 1
- Identical to: 506 = RGN1054 =
- Tube type: Full-Wave Vacuum
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53- First year: 1933
- Base: 7-Pin-Base U7B = m
- Filament: Vf 2.5 Volts / If:
- Identical to: = CV2535
- Tube type: Double Triode Po
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55- First year: 1931
- Base: 6-Pin-Base U6A, ol
- Filament: Vf 2.5 Volts / If
- Identical to: 55 = UZ-55 = A25
- Tube type: Double Diode-Triod
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551 BLUE- First year: 1931
- Base: UY-Base, 5 Pins (U
- Filament: Vf 2.5 Volts / If
- Identical to: 551 = 35 = 35/51 =
- Tube type: Screen-grid Tetrod
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56- First year: 1932
- Base: UY-Base, 5 Pins (U
- Filament: Vf 2.5 Volts / If
- Identical to: 56 = C-56 = 256 =
- Tube type: Triode, vacuum U
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56 BLUE- First year: 1932
- Base: UY-Base, 5 Pins (U
- Filament: Vf 2.5 Volts / If
- Identical to: 56 = C-56 = 256
- Tube type: Triode, vacuum U
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57- First year: 1932
- Base: 6-Pin-Base U6A, ol
- Filament: Vf 2.5 Volts / If:
- Identical to: = PH257 = 257 = UZ
- Tube type: Vacuum Pentode R
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58- First year: 1932
- Base: 6-Pin-Base U6A, ol
- Filament: Vf 2.5 Volts / If:
- Identical to: = PH258 = VT-58 =
- Tube type: Vacuum Pentode R
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