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A409- First year: 1925
- Base: Europe 4-Pin (A,
- Filament: Vf 4 Volts / If 0.
- Identical to: A409 = PM3X = 1-40
- Tube type: Triode, vacuum U
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A4110- First year: 1929
- Base: Europe 5-Pin (O5A,
- Filament: Vf 4 Volts / If
- Identical to: A4110 = REN904 = A
- Tube type: Triode, vacuum U
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A441N- First year: 1926
- Base: Europe 4-Pin (A, 4
- Filament: Vf 4 Volts / If
- Identical to: A441N = AB4
- Tube type: Space Charge Tetro
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AB1- First year: 1934
- Base: Europe 5-Pin (O5A,
- Filament: Vf 4 Volts / If: 0
- Identical to: = A4DD = DD465 =
- Tube type: Double Diode Det
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AB2- First year: 1935
- Base: Europe side contac
- Filament: Vf 4 Volts / If: 0
- Identical to: = 4V2 = 4D1 = 4A21
- Tube type: Double Diode Det
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ABC1- First year: 1935
- Base: Europe side contac
- Filament: Vf 4 Volts / If: 0
- Identical to: = 4V1 = WE37 = A4D
- Tube type: Double Diode-Triod
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ABL1- First year: 1937
- Base: Europe side contac
- Filament: Vf 4 Volts / If: 2
- Identical to: ABL1 = WE41 = TABL
- Tube type: Double Diode-Pento
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AC/HL/DD- Base: British-7-Pin, o
- Filament: Vf 4 Volts / If
- Identical to: AC/HL/DD
- Tube type: Double Diode-Triod
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AC/TH1- Base: British-7-Pin, old
- Filament: Vf 4 Volts / If 1.
- Identical to: ACTH1
- Tube type: Triode-Heptode
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AC/TP- Base: B9 British 9-Pin T
- Filament: Vf 4 Volts / If 1.
- Identical to: AC/TP = VT170_GPO
- Tube type: Triode-Pentode A
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