LL661

Cold-cathode numeric or character indicator cross-referenced to RFT Z567M. The comparison catalog provides striking, maintaining, extinction, current, and mechanical data for the RFT type while cautioning against assuming exact electrical identity.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 13-17 TGL 68-87
Socket code: B13B
Base pins: -
Nominal heater: -

Description

LL661 is a cold-cathode numeric or character indicator tube listed in the supplied German comparison catalog as comparable to RFT type Z567M. The catalog publishes 150 V anode striking, 140 V maintaining, 120 V extinction, a 3–6 mA cathode-current range, and associated display and mechanical data for that RFT type. The source explicitly cautions that comparable tubes are not necessarily identical, so these mapped RFT values are retained as comparison data rather than asserted as exact original-manufacturer ratings.

Socket description

B13B Nixie 13-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 13-17 TGL 68-87
Socket code: B13B
Base pins: -
Nominal heater voltage: -
Nominal heater current: -
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

13-17 TGL 68-87 - 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

Max cathode current: 6 mA
Regulator minimum current: 3 A
Regulator maximum current: 6 A
Regulator starting voltage: 150 V
Regulator maintaining voltage: 140 V

Cold-cathode display section; promoted starting/maintaining voltages and current range are published for comparable RFT type Z567M.

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

1971 Nixie RFT

Published operating points and test conditions from this source.

SECTION 1

Nixie

Other

Comparable RFT Type
Z567M
Catalog cross-reference; comparable types are not guaranteed identical
Minimum Operating Supply Voltage
170 V
Published for comparable RFT type Z567M
Cathode Current Minimum
3 mA
Published for comparable RFT type Z567M
Cathode Current Maximum
6 mA
Published for comparable RFT type Z567M
Peak Cathode Current
20 mA
Published for comparable RFT type Z567M
Ambient Temperature Minimum
-10 °C
Published for comparable RFT type Z567M
Ambient Temperature Maximum
50 °C
Published for comparable RFT type Z567M
Displayed Symbols
+, -, ~
Published for comparable RFT type Z567M
Reading Direction
side
Published for comparable RFT type Z567M
Symbol Height
18 mm
Published for comparable RFT type Z567M
Maximum Viewing Distance
18 m
Published for comparable RFT type Z567M
Mounting Orientation
Pin 8 facing front
Published for comparable RFT type Z567M
Maximum Bulb Height
62 mm
Published for comparable RFT type Z567M
Maximum Bulb Diameter
29.2 mm
Published for comparable RFT type Z567M

Characteristic

Anode Striking Voltage
150 V
Published for comparable RFT type Z567M
Anode Maintaining Voltage
140 V
Published for comparable RFT type Z567M
Anode Extinction Voltage
120 V
Published for comparable RFT type Z567M