Tube-number record
7558
0 archive entries
7558 is a tube type in the TubeDatabase archive (class: Beam Power Tube). Recorded specifications: brand RCA, construction Beam tetrode / beam power, socket Noval (B9A), maximum plate voltage 600 V, and maximum plate dissipation 10 W. The archive does not yet hold a photographed example of this type.
BrandRCA
ClassBeam Power Tube
BaseNoval (B9A)
Filament6.3 V @ 800 mA
Construction
Primary TypeBeam tetrode / beam power
EnvelopeT 6-1/2
Sections1
Filament / Heater
Heater Notes6.3V ± 5%
Absolute Maximum Ratings
Plate Voltage600 V
Plate Dissipation10 W
Grid 2 Voltage250 V
Grid 1 Voltage-125 V
Cathode Current70 mA
H-C Voltage100 V
Audio Performance
Typical THD5%
Power Output20.5 W
Key Features
- Beam Power Tube
- 9-pin miniature type
- Low lead inductance
- Small interelectrode capacitances
- Dual cathode base pins
- Dual Grid No.2 base pins
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 Amplifier | 250 V | 5300 | — | 8.7 | 40 mA |
| Push-Pull Class AB1 (2 tubes) | 300 V | — | 5000 | — | 125 mA |
| RF Power Amplifier Class C (175 Mc) | 250 V | — | — | — | 60 mA |
| Frequency Tripler to 175 Mc | 250 V | — | — | — | 60 mA |
Application Notes
Designed primarily for fixed-station communications equipment. Particularly useful in Class C radio-frequency amplifier, oscillator, and frequency-multiplier service at frequencies up to 175 Mc. Also used in modulator and AF power amplifier applications.
Datasheets
Datasheet: 7558.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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