Tube-number record
7BP7-A
0 archive entries
7BP7-A is a tube type in the TubeDatabase archive (class: Oscillograph Tube). Recorded specifications: brand RCA, year 1948, construction Display / CRT, base Long Medium-Shell Octal, socket Octal, maximum plate voltage 8000 V, and maximum plate dissipation 6 W. The archive does not yet hold a photographed example of this type.
BrandRCA
ClassOscillograph Tube
BaseOctal
Filament6.3 V @ 600 mA
Construction
Primary TypeDisplay / CRT
EnvelopeGlass
Base MaterialLong Medium-Shell Octal
Sections1
Filament / Heater
Heater NotesUnipotential Cathode
Absolute Maximum Ratings
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Operation 1 | 4000 V | — | — | — | — |
| Operation 2 | 7000 V | — | — | — | — |
Application Notes
Brilliance and definition decrease with decreasing anode voltage; generally, anode voltage should not be less than 4000V. Effective resistance of anode supply should limit input power to 6W.
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