Tube-number record
4074-A
0 archive entries
4074-A is a tube type in the TubeDatabase archive (class: Double Triode). Recorded specifications: brand Standard, construction Dual triode, socket 7-pin (non-miniature), maximum plate voltage 300 V, and maximum plate dissipation 5 W. The archive does not yet hold a photographed example of this type.
BrandStandard
ClassDouble Triode
Base7-pin (non-miniature)
Filament6.3 V @ 800 mA
Construction
Primary TypeDual triode
EnvelopeGlass
Sections2
Filament / Heater
Heater NotesConstant voltage type
Absolute Maximum Ratings
Plate Voltage300 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Single Section Constants | 250 V | 3000 | 4700 | 14 | — |
| Class A AF Amp (2 sections parallel) | 300 V | — | — | — | 30 mA |
| Class B AF Amp (Push Pull, 300V condition) | 300 V | — | 7000 | — |
Application Notes
Two sections are identical. For Class A, two sections connected in parallel at the socket. For Class B, two sections connected in push-pull. The fixed bias for Class C should be at least 15 volts to protect the valve in case of failure to oscillate.
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