BH

Cold-cathode twin-diode gas-filled full-wave rectifier requiring no heater supply. Rated for approximately 1 kV peak inverse voltage and 125 mA nominal output for heaterless electronic power supplies.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 8EC
Socket code: -
Base pins: -
Nominal heater: -

Description

BH is a Raytheon cold-cathode twin-diode gas-filled full-wave rectifier requiring no heater supply.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 8EC
Socket code: -
Base pins: -
Nominal heater voltage: -
Nominal heater current: -
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

8EC - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1G3	A	G3 — Suppressor GridGroup 8EC1 EIA chart transcription; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8EC
PIN1IS	A	IS — Internal ScreenGroup 8EC1 EIA chart transcription; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8EC
PIN1K	A	K — CathodeGroup 8EC1 EIA chart transcription; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8EC
PIN2H	—	H — Heater EIA chart transcription; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8EC
PIN3G2	A	G2 — Screen Grid EIA chart transcription; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8EC
PIN4G3	A	G3 — Suppressor GridGroup 8EC4 EIA chart transcription; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8EC
PIN4IS	A	IS — Internal ScreenGroup 8EC4 EIA chart transcription; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8EC
PIN4K	A	K — CathodeGroup 8EC4 EIA chart transcription; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8EC
PIN5G1	A	G1 — Control Grid EIA chart transcription; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8EC
PIN6G3	A	G3 — Suppressor GridGroup 8EC6 EIA chart transcription; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8EC
PIN6IS	A	IS — Internal ScreenGroup 8EC6 EIA chart transcription; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8EC
PIN6K	A	K — CathodeGroup 8EC6 EIA chart transcription; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8EC
PIN7H	—	H — Heater EIA chart transcription; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8EC
PIN8SH	A	SH — Internal Shield Chart transcription; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8EC
CAP1P	A	P — Plate (Anode) Chart transcription; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8EC

Section ratings

2 physical sections, each with unique specifications.

Section 1

Rectifier

X-ray radiationInterelectrode capacitances

Rectifier peak inverse voltage: 1000 V
Rectifier nominal output current: 125 mA
Rectifier peak forward current: 400 mA
Rectifier forward voltage drop: 90 V

Promoted only from clearly identified printed ratings/characteristics; additional operating and limiting values retained in TUBE_SECTION_PARAMETER.

Section 2

Rectifier

X-ray radiationInterelectrode capacitances

Rectifier peak inverse voltage: 1000 V
Rectifier nominal output current: 125 mA
Rectifier peak forward current: 400 mA
Rectifier forward voltage drop: 90 V

Second physical rectifier section added for documented twin-diode full-wave construction.

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

1937 Raytheon Radio Receiving Tubes

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

Maximum AC voltage per plate RMS
350 V
FullWave GasFilled
Maximum DC output current
125 mA
FullWave GasFilled
Maximum peak plate current
400 mA
FullWave GasFilled
Maximum inverse peak voltage
1000 V
FullWave GasFilled

Characteristic

Minimum starting peak voltage
350 V
FullWave GasFilled
Average dynamic voltage drop
90 V
FullWave GasFilled

Data set 02

195X Raytheon Special Purpose Tubes

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

Peak inverse voltage maximum
1000 V
FullWave;Gas
Peak plate current per plate maximum
400 mA
FullWave;Gas
DC output current maximum
125 mA
FullWave;Gas

Characteristic

Average tube voltage drop
90 V
FullWave;Gas

SECTION 2

Rectifier

Other

Peak inverse voltage maximum
1000 V
FullWave;Gas
Peak plate current per plate maximum
400 mA
FullWave;Gas