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RV12P2000
- First year: 1937
- Base: Side contact S8B (
- Filament: Vf 12.6 Volts / If
- Identical to: = PV1
- Tube type: Vacuum Pentode U
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RV12P4000
- Base: OTHER TUBEBASE i
- Filament: Vf 12.6 Volts / If
- Identical to: RV12P4000
- Tube type: Vacuum Pentode R
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RV2P800
- Base: OTHER TUBEBASE in
- Filament: Vf 1.9 Volts / If:
- Tube type: Vacuum Pentode R
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R_COSSOR
- First year: 1922
- Base: Europe 4-Pin (A,
- Filament: Vf 4 Volts / If 0.
- Identical to: R_Marconi = TM
- Tube type: Triode, vacuum U
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TAC 2
- Base: Vf 4 Volts / If
- Filament: Indirect / Paralle
- Identical to: TAC2 = AC2
- Tube type: Triode, vacuum U
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TAF3
- First year: 1935
- Base: Europe side contac
- Filament: Vf 4 Volts / If 0.
- Identical to: TAF3 = AF3
- Tube type: Vacuum Pentode R
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TAK2
- Base: Europe side contac
- Filament: Vf 4 Volts / If
- Identical to: TAK2 = AK2
- Tube type: OCTODE Frequency
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TB1_Kenotron
- First year: 1918
- Base: OTHER TUBEBASE in
- Filament: Vf 7.5 Volts / I
- Identical to: TB1_Kenotron
- Tube type: Half-Wave Vacuum R
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TDD2A
- Base: Europe 5-Pin (O5
- Filament: Vf 2 Volts / If 0.
- Identical to: TDD2A
- Tube type: Double Diode-Tri
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TE24N
- First year: 1929?
- Base: Europe 5-Pin (O5A,
- Filament: Vf 4 Volts / If 1
- Identical to: TE24N = E424N
- Tube type: TRIODE (Detail unc
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