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AC/VP1- Base: British-7-Pin, o
- Filament: Vf 4 Volts / If 0.
- Identical to: AC/VP1
- Tube type: Vacuum Pentode R
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AC2- First year: 1935
- Base: Europe side cont
- Filament: Vf 4 Volts / If 0.
- Identical to: AC2 = 4A20 = TAC2
- Tube type: Triode, vacuum U
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ACH1- First year: 1934
- Base: Europe 7-Pin (C7A,
- Filament: Vf 4 Volts / If: 1
- Identical to: = TH401 = 4M2 = WE
- Tube type: Triode-Hexode Fr
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AD100- First year: 1939
- Base: EU-Telephone 7-p
- Filament: Vf 4 Volts / If 1.
- Identical to: AD100
- Tube type: Triode, vacuum P
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AF2- First year: 1933
- Base: Europe 5-Pin (O5A,
- Filament: Vf 4 Volts / If 1.
- Identical to: AF2 = TF2 = WE25 =
- Tube type: Vacuum Pentode R
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AF3- First year: 1935
- Base: Europe side contac
- Filament: Vf 4 Volts / If: 0
- Identical to: = WE33 = A4AMS3 =
- Tube type: Vacuum Pentode R
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AF7- First year: 1935
- Base: Europe side contac
- Filament: Vf 4 Volts / If: 0
- Identical to: = 4H1 = A4AM7 = TA
- Tube type: Vacuum Pentode U
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AH1- First year: 1935
- Base: Europe side contac
- Filament: Vf 4 Volts / If: 0
- Identical to: AH1 = TAH1 = VX4S
- Tube type: HEXODE Universal
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AK1- First year: 1934
- Base: Europe 7-Pin (C7A,
- Filament: Vf 4 Volts / If: 0
- Identical to: = TK1 = MO465 = WE
- Tube type: OCTODE Frequency
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AK2- First year: 1935
- Base: Europe side contac
- Filament: Vf 4 Volts / If: 0
- Identical to: = 4M1 = TAK2 = TK2
- Tube type: OCTODE Frequency
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