Tube cross-reference

1A4T alternatives, equivalents, and replacements

Review exact electrical variations and directional substitutions recorded for the 1A4T voltage pentode - remote cutoff (single). Compare core specifications and verify every restriction before using a replacement.

Replacement tubes for 1A4T

The following tubes are recorded as possible replacements for 1A4T. This direction does not establish that 1A4T can replace them.

1A4

Voltage Pentode

Receiving Tubes

The database records 1A4 as a possible replacement for1A4T.

No special restrictions are recorded for this substitution.

Specification	Original tube	Replacement
Tube type	Voltage Pentode - Remote Cutoff (single)	Voltage Pentode
Construction	Pentode	Pentode
Base	4K	Not recorded
Socket	UX4	Not recorded
Base pins	4	Not recorded
Sections	1	1
Heater voltage	2 V	2 V
Heater current	0.06 A	0.06 A

1A4P

Voltage Pentode - Remote Cutoff (single)

Receiving Tubes

The database records 1A4P as a possible replacement for1A4T.

No special restrictions are recorded for this substitution.

Specification	Original tube	Replacement
Tube type	Voltage Pentode - Remote Cutoff (single)	Voltage Pentode - Remote Cutoff (single)
Construction	Pentode	Pentode
Base	4K	4M
Socket	UX4	UX4
Base pins	4	4
Sections	1	1
Heater voltage	2 V	2 V
Heater current	0.06 A	0.06 A

1B4

Voltage Pentode - High Frequency (single)

Receiving Tubes

The database records 1B4 as a possible replacement for1A4T.

No special restrictions are recorded for this substitution.

Specification	Original tube	Replacement
Tube type	Voltage Pentode - Remote Cutoff (single)	Voltage Pentode - High Frequency (single)
Construction	Pentode	Pentode
Base	4K	Not recorded
Socket	UX4	Not recorded
Base pins	4	5
Sections	1	1
Heater voltage	2 V	2 V
Heater current	0.06 A	0.06 A

1B4P

Voltage Pentode - Sharp Cutoff (single)

Receiving Tubes

The database records 1B4P as a possible replacement for1A4T.

No special restrictions are recorded for this substitution.

Specification	Original tube	Replacement
Tube type	Voltage Pentode - Remote Cutoff (single)	Voltage Pentode - Sharp Cutoff (single)
Construction	Pentode	Pentode
Base	4K	4M
Socket	UX4	UX4
Base pins	4	4
Sections	1	1
Heater voltage	2 V	2 V
Heater current	0.06 A	0.06 A

1K4

Voltage Pentode

Receiving Tubes

The database records 1K4 as a possible replacement for1A4T.

Parallel heater circuits only

Specification	Original tube	Replacement
Tube type	Voltage Pentode - Remote Cutoff (single)	Voltage Pentode
Construction	Pentode	Pentode
Base	4K	Not recorded
Socket	UX4	UX4
Base pins	4	4
Sections	1	1
Heater voltage	2 V	2 V
Heater current	0.06 A	0.12 A

Voltage Tetrode

Receiving Tubes

The database records 32 as a possible replacement for1A4T.

No special restrictions are recorded for this substitution.

Specification	Original tube	Replacement
Tube type	Voltage Pentode - Remote Cutoff (single)	Voltage Tetrode
Construction	Pentode	Tetrode
Base	4K	4K
Socket	UX4	UX4
Base pins	4	4
Sections	1	1
Heater voltage	2 V	2 V
Heater current	0.06 A	0.06 A

Voltage Pentode - Remote Cutoff (single)

Receiving Tubes

The database records 34 as a possible replacement for1A4T.

No special restrictions are recorded for this substitution.

Specification	Original tube	Replacement
Tube type	Voltage Pentode - Remote Cutoff (single)	Voltage Pentode - Remote Cutoff (single)
Construction	Pentode	Pentode
Base	4K	4M
Socket	UX4	IO
Base pins	4	7
Sections	1	1
Heater voltage	2 V	2 V
Heater current	0.06 A	0.06 A

951

Voltage Pentode - High Frequency (single)

Receiving Tubes

The database records 951 as a possible replacement for1A4T.

No special restrictions are recorded for this substitution.

Specification	Original tube	Replacement
Tube type	Voltage Pentode - Remote Cutoff (single)	Voltage Pentode - High Frequency (single)
Construction	Pentode	Pentode
Base	4K	Not recorded
Socket	UX4	UX4
Base pins	4	4
Sections	1	1
Heater voltage	2 V	2 V
Heater current	0.06 A	0.06 A

Where 1A4T can be used as the replacement

In these recorded relationships, 1A4T is the replacement tube. The listed original tubes are not automatically suitable as replacements for 1A4T.

1A4

Voltage Pentode

Receiving Tubes

The database records 1A4T as a possible replacement for1A4.

No special restrictions are recorded for this substitution.

Specification	1A4T replacement	Original tube
Tube type	Voltage Pentode - Remote Cutoff (single)	Voltage Pentode
Construction	Pentode	Pentode
Base	4K	Not recorded
Socket	UX4	Not recorded
Base pins	4	Not recorded
Sections	1	1
Heater voltage	2 V	2 V
Heater current	0.06 A	0.06 A

1A4P

Voltage Pentode - Remote Cutoff (single)

Receiving Tubes

The database records 1A4T as a possible replacement for1A4P.

No special restrictions are recorded for this substitution.

Specification	1A4T replacement	Original tube
Tube type	Voltage Pentode - Remote Cutoff (single)	Voltage Pentode - Remote Cutoff (single)
Construction	Pentode	Pentode
Base	4K	4M
Socket	UX4	UX4
Base pins	4	4
Sections	1	1
Heater voltage	2 V	2 V
Heater current	0.06 A	0.06 A

1B4

Voltage Pentode - High Frequency (single)

Receiving Tubes

The database records 1A4T as a possible replacement for1B4.

No special restrictions are recorded for this substitution.

Specification	1A4T replacement	Original tube
Tube type	Voltage Pentode - Remote Cutoff (single)	Voltage Pentode - High Frequency (single)
Construction	Pentode	Pentode
Base	4K	Not recorded
Socket	UX4	Not recorded
Base pins	4	5
Sections	1	1
Heater voltage	2 V	2 V
Heater current	0.06 A	0.06 A

1B4P

Voltage Pentode - Sharp Cutoff (single)

Receiving Tubes

The database records 1A4T as a possible replacement for1B4P.

No special restrictions are recorded for this substitution.

Specification	1A4T replacement	Original tube
Tube type	Voltage Pentode - Remote Cutoff (single)	Voltage Pentode - Sharp Cutoff (single)
Construction	Pentode	Pentode
Base	4K	4M
Socket	UX4	UX4
Base pins	4	4
Sections	1	1
Heater voltage	2 V	2 V
Heater current	0.06 A	0.06 A

1K4

Voltage Pentode

Receiving Tubes

The database records 1A4T as a possible replacement for1K4.

Parallel heater circuits only

Specification	1A4T replacement	Original tube
Tube type	Voltage Pentode - Remote Cutoff (single)	Voltage Pentode
Construction	Pentode	Pentode
Base	4K	Not recorded
Socket	UX4	UX4
Base pins	4	4
Sections	1	1
Heater voltage	2 V	2 V
Heater current	0.06 A	0.12 A

Voltage Tetrode

Receiving Tubes

The database records 1A4T as a possible replacement for32.

No special restrictions are recorded for this substitution.

Specification	1A4T replacement	Original tube
Tube type	Voltage Pentode - Remote Cutoff (single)	Voltage Tetrode
Construction	Pentode	Tetrode
Base	4K	4K
Socket	UX4	UX4
Base pins	4	4
Sections	1	1
Heater voltage	2 V	2 V
Heater current	0.06 A	0.06 A

Voltage Pentode - Remote Cutoff (single)

Receiving Tubes

The database records 1A4T as a possible replacement for34.

No special restrictions are recorded for this substitution.

Specification	1A4T replacement	Original tube
Tube type	Voltage Pentode - Remote Cutoff (single)	Voltage Pentode - Remote Cutoff (single)
Construction	Pentode	Pentode
Base	4K	4M
Socket	UX4	IO
Base pins	4	7
Sections	1	1
Heater voltage	2 V	2 V
Heater current	0.06 A	0.06 A

951

Voltage Pentode - High Frequency (single)

Receiving Tubes

The database records 1A4T as a possible replacement for951.

No special restrictions are recorded for this substitution.

Specification	1A4T replacement	Original tube
Tube type	Voltage Pentode - Remote Cutoff (single)	Voltage Pentode - High Frequency (single)
Construction	Pentode	Pentode
Base	4K	Not recorded
Socket	UX4	UX4
Base pins	4	4
Sections	1	1
Heater voltage	2 V	2 V
Heater current	0.06 A	0.06 A

Verify before substituting

Matching a base or heater voltage is not enough to prove that two tubes are interchangeable. Check pin connections, heater current, maximum ratings, bias requirements, warm-up behavior, and the equipment manufacturer’s service documentation before making a substitution.

View the complete 1A4T specifications →