## Fast Filters

By type
• ### 59

• First year: 1932
• Base: 7-Pin-Base U7B = m
• Filament: Vf 2.5 Volts / If
• Identical to: 59 = CV2538 = PH59
• Tube type: Vacuum Pentode P
• ### 5Z3

• First year: 1933
• Base: UX-Base (4 Pins (2
• Filament: Vf 5 Volts / If 3
• Identical to: 5Z3 = KX5Z3 = 5Z3G
• Tube type: Full-Wave Vacuum R
• ### 6A6

• First year: 1934
• Base: 7-Pin-Base U7B
• Filament: Vf 6.3 Volts / I
• Identical to: 6A6 = 6A6X
• Tube type: Double Triode Po
• ### 6A7

• First year: 1933
• Base: 7-Pin-Base U7A = s
• Filament: Vf 6.3 Volts / If:
• Identical to: = Ut6A7 = Ut-6A7 =
• Tube type: Pentagrid-Converte
• ### 6A8

• First year: 1935
• Base: Octal (Int.Octal,
• Filament: Vf 6.3 Volts / If:
• Identical to: = 6Q8 = 6a8
• Tube type: Pentagrid-Converte
• ### 6AC7

• First year: 1939
• Base: Octal (Int.Octal,
• Filament: Vf 6.3 Volts / If:
• Identical to: = OSW2190 = 6j4 =
• Tube type: Vacuum Pentode R
• ### 6B6

• First year: 1935
• Base: Octal (Int.Octal,
• Filament: Vf 6.3 Volts / If:
• Tube type: Double Diode-Triod
• ### 6B7

• First year: 1933
• Base: 7-Pin-Base U7A = s
• Filament: Vf 6.3 Volts / If:
• Identical to: = Ut6B7 = Ut-6B7
• Tube type: Double Diode-Pento
• ### 6C6

• First year: 1933
• Base: 6-Pin-Base U6A, ol
• Filament: Vf 6.3 Volts / If:
• Identical to: = UZ6C6 = UZ-6C6 =
• Tube type: Vacuum Pentode U
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