BD255

Gas-filled cold-cathode Nixie special-character indicator designed to display plus/minus or other dedicated symbols using shaped glow cathodes.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: SK116
Base pins: -
Nominal heater: -

Description

BD255 is listed in the shared Burroughs Nixie numerical-readout catalog. The source establishes the gas-filled cold-cathode Nixie display principle, but the model-specific electrical cross-reference is not unambiguous enough to assign exact table values without guessing.

Socket description

SK-116 11-contact miniature Nixie socket family

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: SK116
Base pins: -
Nominal heater voltage: -
Nominal heater current: -
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

Nixie

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Gas-filled cold-cathode Nixie special-character indicator; plus and minus special-character tube (alias of B4022). Electrical/mechanical characteristics are stated to be generally comparable to the corresponding regular numerical tube family (7009).

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

1961 Nixie Burroughs

Published operating points and test conditions from this source.

SECTION 1

Nixie

Description

Display Principle
Glow discharge
Gas-filled cold-cathode readout principle

Data set 02

196X Burroughs Nixie

Published operating points and test conditions from this source.

SECTION 1

Nixie

Other

Ionization voltage
170 V
Absolute rating; maximum
Minimum supply voltage
170 V
Absolute rating; minimum recommended supply
Cathode current
2 mA
Peak
Cathode current
1 mA
Average
Individual cathode dissipation
0.2 W
Maximum
Anode supply voltage
170 V
BasicCircuit test condition
Anode series resistor
68 kOhm
BasicCircuit test condition
Cathode current
0.7 to 1.2 mA
BasicCircuit test condition
Numeral height
0.305 in
Miniature
Recommended anode series resistor
68 kOhm
Anode supply 170 V
Recommended anode series resistor
150 kOhm
Anode supply 250 V
Recommended anode series resistor
200 kOhm
Anode supply 300 V
Pre-bias voltage
60 to 75 V
Referenced to on cathode