Electronic tube and vacuum tube catalog

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Heater

6.3 V / 500 mA

Reverse-action vacuum thermal-delay switch. Heater warm-up mechanically changes the contact state after a time delay, providing sequencing and protection in electronic equipment.

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Socket code

B4

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Heater

92 mA

B4 - European 4-pin base

Bimetal thermal relay providing a roughly 60–100 second timing interval at the documented heater current, intended for delayed switching and control functions in electronic equipment.

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Heater

100 mA

Philips bimetal thermal relay designed for timed switching applications, using heater-controlled mechanical action to provide delayed circuit operation.

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8 pins

Hermetically sealed thermal time-delay relay in a glass envelope. Heater warm-up changes the contact state after a controlled delay for sequencing and protection.

Base

B4

Socket code

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Heater

4 V / 1.5 A

4 pins

Vacuum thermal-delay switch. Heater warm-up mechanically changes the contact state after a controlled delay for sequencing, protection, and power-control circuits.

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Socket code

IO

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Heater

4 V / 750 mA

4 pins - IO - International Octal

Vacuum thermal-delay switch using a four-volt heater. Thermal expansion changes the internal contact state after a controlled delay for sequencing and protection.

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Heater

6.3 V / 480 mA

8 pins

Vacuum thermal-delay switch and companion to DLS15. Heater warm-up produces a delayed mechanical contact change for electronic sequencing and protection.

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Heater

4 V / 1.5 A

Vacuum thermal-delay switch. Controlled heater warm-up actuates internal contacts after a time interval for sequencing and protective control.

Base

B7G

Socket code

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Sections

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Heater

6.3 V / 500 mA

7 pins

Miniature vacuum thermal-delay switch. Heater warm-up actuates sealed contacts after a controlled interval for sequencing and equipment protection.

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Socket code

IO

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Heater

2.5 V / 1 A

8 pins - IO - International Octal

Vacuum thermal-delay switch using a low-voltage heater. Thermal actuation changes sealed contacts after a controlled delay for sequencing and protection.

Base

B7G

Socket code

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Sections

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Heater

6.3 V / 500 mA

7 pins

Reverse-action vacuum thermal-delay switch. Heater warm-up changes the sealed contact state after a controlled interval for sequencing and protective circuits.

Base

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Socket code

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Heater

4 V / 1.5 A

Double-action vacuum thermal-delay switch. Heater-driven thermal movement operates multiple contact actions after controlled delays for sequencing and equipment protection.

Base

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Socket code

B7G

Sections

1

Heater

6.3 V / 500 mA

B7G - Miniature 7-contact

Miniature thermal-delay switch. Heater warm-up actuates sealed contacts after a controlled time interval for sequencing and protection.

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Socket code

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Heater

6.3 V / 500 mA

Thermal-delay switching device of the S1021 family. Available source material supports delayed switching service without enough detail for a narrower operating description.

Base

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Socket code

B7G

Sections

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Heater

115 mA

B7G - Miniature 7-contact

Miniature thermal-delay switch. Thermal actuation changes the sealed contact state after a controlled delay for sequencing and protective circuits.

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Heater

115 mA

Miniature thermal-delay switch. Heater-driven thermal movement operates sealed contacts after a controlled interval for electronic sequencing and protection.

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Sections

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Heater

6.3 V / 500 mA

Miniature thermal-delay switch designed to delay application of anode voltage to indirectly heated valves and mercury-vapor rectifiers, with a specified delay around 44–66 seconds at room temperature.

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Heater

6.3 V / 500 mA

Probable alternate rendering of the VLS631 miniature thermal-delay switch; no independent source artifact is presently attached, so the functional assignment follows the corresponding documented designation conservatively.