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By type
  • 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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  • 59

  • First year: 1932
  • Base: 7-Pin-Base U7B = m
  • Filament: Vf 2.5 Volts / If
  • Identical to: 59 = CV2538 = PH59
  • Tube type: Vacuum Pentode P
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