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224A- First year: 1929
- Base: UY-Base, 5 Pins (U
- Filament: Vf 2.5 Volts / If
- Identical to: 224A = 24A
- Tube type: Screen-grid Tetrod
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227- First year: 1927
- Base: UY-Base, 5 Pins (U
- Filament: Vf 2.5 Volts / If
- Identical to: 227 = 27 = DE-1 =
- Tube type: Triode, vacuum U
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230- First year: 1930
- Base: UX-Base (4 Pins (2
- Filament: Vf 2 Volts / If 0.
- Identical to: 230 = 30 = CX330 =
- Tube type: Triode, vacuum U
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24- First year: 1929
- Base: UY-Base, 5 Pins (U
- Filament: Vf 2.5 Volts / If:
- Identical to: = VT-28 = 224 = A2
- Tube type: Screen-grid Tetrod
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24A- First year: 1929
- Base: UY-Base, 5 Pins (U
- Filament: Vf 2.5 Volts / If
- Identical to: 24A = 124 = UY-24B
- Tube type: Screen-grid Tetrod
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25Z5- First year: 1933
- Base: 6-Pin-Base U6A,
- Filament: Vf 25 Volts / If
- Identical to: 25Z5
- Tube type: High-vacuum Rectif
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25Z6- First year: 1935
- Base: Octal (Int.Octal,
- Filament: Vf 25 Volts / If
- Identical to: 25Z6
- Tube type: High-vacuum Rectif
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26- First year: 1927
- Base: UX-Base (4 Pins (2
- Filament: Vf 1.5 Volts / If
- Identical to: 26 = REN326 = G-26
- Tube type: Triode, vacuum
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27 BLUE- First year: 1927
- Base: UY-Base, 5 Pins (U
- Filament: Vf 2.5 Volts / If:
- Identical to: = C327 = DE-1 = 22
- Tube type: Triode, vacuum U
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2A5- First year: 1932
- Base: 6-Pin-Base U6A,
- Filament: Vf 2.5 Volts / I
- Identical to: 2A5 = PH2A5 = PZH
- Tube type: Vacuum Pentode P
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