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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 4,2 P40 vacuum tube outline illustration

Tube-number record

RL 4,2 P40

0 archive entries

RL 4,2 P40 is a tube type in the TubeDatabase archive (class: Sendepentode). Recorded specifications: brand Telefunken, year 1941, construction Pentode, socket Special / none, maximum plate voltage 800 V, and maximum plate dissipation 35 W. The archive does not yet hold a photographed example of this type.

BrandTelefunken
ClassSendepentode
BaseSpecial / none

Construction

Primary TypePentode
EnvelopeGlass
Sections1

Filament / Heater

Materialoxide

Absolute Maximum Ratings

Plate Voltage800 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
HF-Verstärkung (B-Betrieb) @ 800V800 V38005500—90 mA
HF-Verstärkung (B-Betrieb) @ 400V400 V38002300—100 mA
HF-Verstärkung (C-Betrieb)800 V—4450—

Application Notes

For series connection of three tubes, heater voltage fluctuations between 11V and 13.5V are permitted. Underheating at 3.6V can lead to 30% power loss in HF operation.

Filters

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Manufacturers

Brands

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    Plate Dissipation
    35 W
    Grid 2 Voltage200 V
    Cathode Current150 mA

    Audio Performance

    Key Features
    • 40 Watt power output
    • Directly heated oxide cathode
    • Transmitting pentode
    90 mA