8506

Metal-ceramic planar UHF triode for radio-frequency power-amplifier service. Its high transconductance and amplification factor around 110 combine strong gain with extremely low plate-to-cathode capacitance in compact high-frequency circuitry.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 400 mA

Description

Metal-ceramic planar UHF triode for radio-frequency power-amplifier service.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 6.3 V
Nominal heater current: 400 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.029 S
Amplification factor: 110
Max plate voltage: 300 V
Max plate dissipation: 5 W
Max cathode current: 40 mA

Promoted fields are used only where the published value maps cleanly to the locked schema; device-specific microwave, pulse, photoelectric, camera, and indicator data are preserved as parameter rows.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

1964 RMA EIA

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

Grid-to-plate capacitance
2.5 pF
Grid-to-cathode capacitance
4.8 pF
Plate-to-cathode capacitance
0.025 pF

Other

Plate voltage maximum
300 V
Plate dissipation maximum
5 W
Grid current maximum
2 mA
Cathode current maximum
40 mA

Characteristics

Plate voltage
200 V
Cathode resistor
40 Ohm
Amplification factor
110 ratio
Transconductance
29000 uS
Plate current
25 mA
Grid voltage
-3.5 V
Ib=50uA