6B8P

Receiving tube combining radio signal detection or control-voltage rectification with associated voltage amplification. Its detector function is integral to receiver signal processing and supports classification within the radio detector/converter family.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 3
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 300 mA

Description

Indirectly heated dual-diode pentode for high- and low-frequency voltage amplification, detection, and automatic volume control.

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: 300 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

3 physical sections, each with unique specifications.

Section 1

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Shuguang 6B8P first physical diode of a double-diode pentode for radio detection and automatic volume control. Manufacturer maximum rectified current is 1 mA per diode; typical/test rectified current is stated separately. This value applies to the diode and is not a pentode cathode-current maximum. Separate physical diode section 3 is retained.

Section 2

Pentode

X-ray radiationInterelectrode capacitances

Transconductance: 0.00185 S
Max plate voltage: 275 V
Max screen voltage: 140 V
Max plate dissipation: 4 W
Max screen dissipation: 0.3 W

Shuguang 6B8P indirectly heated double-diode pentode for RF/AF voltage amplification, detection and AVC. Pentode typical anode 250 V, grid-2 screen 125 V, control grid -3 V, anode current approximately 10 mA, screen current approximately 2.45 mA, transconductance 1.85 mA/V (0.00185 S). These typical operating points are distinct from explicit manufacturer maxima: anode 275 V, grid-2 140 V, plate dissipation 4.0 W and screen dissipation 0.3 W. Direct interelectrode capacitances published (input, output, transfer); capacitor flag true. Two separate diode sections each have their own rectifier ratings, including 1 mA per diode maximum, which are not pentode cathode-current maxima. Chinese source heater 6.3 V 300±25 mA.

Section 3

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Second physical diode of Chinese Shuguang 6B8P double-diode pentode, used for signal detection and automatic volume control. Manufacturer publishes up to 1 mA maximum rectified current per physical diode; approximate stated minimum/test diode current 220 µA is not a general maximum. Do not apply the diode current limit to the separate pentode cathode field. Physical diode retained independent of first diode.

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

198X Shuguang

Published operating points and test conditions from this source.

SECTION 1

Diode

Characteristics

Heater voltage
6.3 V
Nominal
Heater current
300 mA
Nominal
Plate voltage
250 V
Published principal electrical parameter