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36- First year: 1931
- Base: UY-Base, 5 Pins
- Filament: Vf 6.3 Volts / I
- Identical to: 36 = 136A = 236
- Tube type: Screen-grid Tetrod
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37- First year: 1931
- Base: UY-Base, 5 Pins (U
- Filament: Vf 6.3 Volts / If:
- Identical to: = UY37 = VT-37 = E
- Tube type: Triode, vacuum R
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38- First year: 1931
- Base: UY-Base, 5 Pins (U
- Filament: Vf 6.3 Volts / I
- Identical to: 38 = 138A = UY38
- Tube type: Vacuum Pentode P
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39/44- First year: 1935
- Base: UY-Base, 5 Pins (U
- Filament: Vf 6.3 Volts / If:
- Identical to: 39/44 = VT-49
- Tube type: Vacuum Pentode R
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3NFK- First year: 1931
- Base: Loewe Bajonet, 6-p
- Filament: Vf 4 Volts / If 1.
- Identical to: 3NFK
- Tube type: MULTI-SYSTEM, inte
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41- First year: 1933
- Base: 6-Pin-Base U6A, ol
- Filament: Vf 6.3 Volts / If:
- Identical to: = PH41 = ER41 = VT
- Tube type: Vacuum Pentode P
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42- First year: 1932
- Base: 6-Pin-Base U6A,
- Filament: Vf 6.3 Volts / I
- Identical to: 42 = UZ-42 = 6Z-P1
- Tube type: Vacuum Pentode P
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43- First year: 1933
- Base: 6-Pin-Base U6A,
- Filament: Vf 25 Volts / If 0
- Identical to: 43 = ER43 = CV2514
- Tube type: Vacuum Pentode P
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44- First year: 1932
- Base: UY-Base, 5 Pins (U
- Filament: Vf 6.3 Volts / If:
- Identical to: 44 = 144
- Tube type: Vacuum Pentode R
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45- First year: 1929
- Base: UX-Base (4 Pins (2
- Filament: Vf 2.5 Volts / If
- Identical to: 45 = 245 = CX345
- Tube type: Triode, vacuum P
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