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2T270K

Miniature high-vacuum half-wave rectifier for very-high-voltage, low-current power supplies. Rated for approximately 12.5 kV peak inverse voltage, 5 mA DC output, and 40 mA peak current.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: B7G
Socket code: B7G
Base pins: 7
Nominal heater: 4 V / 500 mA

Description

Miniature high-vacuum half-wave high-voltage rectifier.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: B7G
Socket code: B7G
Base pins: 7
Nominal heater voltage: 4 V
Nominal heater current: 500 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

B7G - 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

Rectifier

X-ray radiationInterelectrode capacitances

Rectifier peak inverse voltage: 12500 V
Rectifier nominal output current: 5 mA
Rectifier peak forward current: 40 mA
Rectifier warm-up time: 30 s

Mercury-vapour or high-voltage rectifier ratings promoted from the published maximum-ratings table.

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

1946 Standard Telephone and Cables

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

Maximum applied RMS voltage
5.5 kV
CapacitorInputFilter
Maximum no-load peak inverse voltage
15.5 kV
CapacitorInputFilter
Recommended reservoir capacitor
0.3 uF
CapacitorInputFilter
Minimum limiting equivalent resistor
50 kOhm
CapacitorInputFilter
Minimum anode-supply delay
30 s
CapacitorInputFilter

Data set 02

1947 Standard Valves

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

MaximumAppliedRMSVoltage
5.5 kV
MaximumAppliedRMSVoltageSimultaneousHeaterAnodeSwitching
3.5 kV
MaximumNoLoadPeakInverseVoltage
15.5 kV
RecommendedReservoirCondenser
0.25 uF
CapacitorInputFilter 50Hz
MinimumSeriesLimitingResistance
62000 ohm
5.5kV RMS CapacitorInputFilter