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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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5Z3- First year: 1933
- Base: UX-Base (4 Pins (2
- Filament: Vf 5 Volts / If 3
- Identical to: 5Z3 = KX5Z3 = 5Z3G
- Tube type: Full-Wave Vacuum R
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6A6- First year: 1934
- Base: 7-Pin-Base U7B
- Filament: Vf 6.3 Volts / I
- Identical to: 6A6 = 6A6X
- Tube type: Double Triode Po
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6A7- First year: 1933
- Base: 7-Pin-Base U7A = s
- Filament: Vf 6.3 Volts / If:
- Identical to: = Ut6A7 = Ut-6A7 =
- Tube type: Pentagrid-Converte
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6A8- First year: 1935
- Base: Octal (Int.Octal,
- Filament: Vf 6.3 Volts / If:
- Identical to: = 6Q8 = 6a8
- Tube type: Pentagrid-Converte
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6AC7- First year: 1939
- Base: Octal (Int.Octal,
- Filament: Vf 6.3 Volts / If:
- Identical to: = OSW2190 = 6j4 =
- Tube type: Vacuum Pentode R
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6B6- First year: 1935
- Base: Octal (Int.Octal,
- Filament: Vf 6.3 Volts / If:
- Tube type: Double Diode-Triod
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6B7- First year: 1933
- Base: 7-Pin-Base U7A = s
- Filament: Vf 6.3 Volts / If:
- Identical to: = Ut6B7 = Ut-6B7
- Tube type: Double Diode-Pento
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6C6- First year: 1933
- Base: 6-Pin-Base U6A, ol
- Filament: Vf 6.3 Volts / If:
- Identical to: = UZ6C6 = UZ-6C6 =
- Tube type: Vacuum Pentode U
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6D6- First year: 1933
- Base: 6-Pin-Base U6A, ol
- Filament: Vf 6.3 Volts / If:
- Identical to: = UZ-6D6 = UZ6D6 =
- Tube type: Vacuum Pentode R
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