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Tube Database (7,341 tube types · 1,270 archive entries)

Pre (2,630 tube types), Other (2,603 tube types), Power (1,292 tube types), Rectifier (816 tube types)
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RL 4,8 P15 vacuum tube outline illustration

Tube-number record

RL 4,8 P15

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RL 4,8 P15 is a tube type in the TubeDatabase archive (class: Sendepentode mit eingebauter Diode). Recorded specifications: brand Telefunken, construction Pentode, socket Special / none, maximum plate voltage 400 V, and maximum plate dissipation 15 W. The archive does not yet hold a photographed example of this type.

BrandTelefunken
ClassSendepentode mit eingebauter Diode
BaseSpecial / none

Construction

Primary TypePentode
Rectifier TypeHalf-wave Diode
EnvelopeGlass
SectionsDouble (Pentode/Diode)

Filament / Heater

MaterialOxide

Absolute Maximum Ratings

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Static Characteristics220 V4000——50 mA
Telegrafie-Betrieb (Eintakt)350 V———57 mA

Application Notes

Die Mitte des Heizfadens ist ausgeführt, so daß Betrieb mit 2,4 V Heizspannung bei doppeltem Heizstrom möglich ist. Serienschaltung mehrerer Röhren ohne Ausgleichswiderstände ist nicht zulässig.

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    Plate Voltage400 V
    Plate Dissipation15 W
    Grid 2 Voltage200 V
    Grid 1 Voltage-200 V
    Cathode Current75 mA

    Audio Performance

    Key Features
    • Center-tapped filament (allows 2.4V operation)
    • Integrated detector diode
    • Optimized for telegraphy and grid modulation