Tube cross-reference

6CF6 alternatives, equivalents, and replacements

Review exact electrical variations and directional substitutions recorded for the 6CF6 voltage pentode - sharp cutoff (single). Compare core specifications and verify every restriction before using a replacement.

Exact variations of 6CF6

These designations belong to the same electrical variation group. Their names may differ because of international standards, manufacturing tolerances, or materials, but they are recorded as electrically equivalent—not merely substitutes.

6CB6A
Voltage Pentode - Sharp Cutoff (single)
Base
7CM
Socket
B7G
Base pins
7
Sections
1
Heater voltage
6.3 V
Heater current
0.3 A

Replacement tubes for 6CF6

The following tubes are recorded as possible replacements for 6CF6. This direction does not establish that 6CF6 can replace them.

6AG5

Voltage Pentode - Sharp Cutoff (single)

Receiving Tubes

The database records 6AG5 as a possible replacement for6CF6.

Not suitable for all circuits

Specification	Original tube	Replacement
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Sharp Cutoff (single)
Construction	Pentode	Pentode
Base	7CM	E7-1
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.3 A

6AU6

Voltage Pentode - Sharp Cutoff (single)

Receiving Tubes

The database records 6AU6 as a possible replacement for6CF6.

Not suitable for all circuits

Specification	Original tube	Replacement
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Sharp Cutoff (single)
Construction	Pentode	Pentode
Base	7CM	7BK
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.3 A

6AU6A

Voltage Pentode - Sharp Cutoff (single)

Receiving Tubes

The database records 6AU6A as a possible replacement for6CF6.

Not suitable for all circuits

Specification	Original tube	Replacement
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Sharp Cutoff (single)
Construction	Pentode	Pentode
Base	7CM	7BK
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.3 A

6BC5

Voltage Pentode - Sharp Cutoff (single)

Receiving Tubes

The database records 6BC5 as a possible replacement for6CF6.

Not suitable for all circuits

Specification	Original tube	Replacement
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Sharp Cutoff (single)
Construction	Pentode	Pentode
Base	7CM	7BC
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.6 A

6BH6

Voltage Pentode - Sharp Cutoff (single)

Receiving Tubes

The database records 6BH6 as a possible replacement for6CF6.

Parallel heater circuits only

Specification	Original tube	Replacement
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Sharp Cutoff (single)
Construction	Pentode	Pentode
Base	7CM	7CM
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.15 A

6CB6

Voltage Pentode

Receiving Tubes

The database records 6CB6 as a possible replacement for6CF6.

No special restrictions are recorded for this substitution.

Specification	Original tube	Replacement
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode
Construction	Pentode	Pentode
Base	7CM	7CM
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.3 A

6CB6A

Voltage Pentode - Sharp Cutoff (single)

Receiving Tubes

The database records 6CB6A as a possible replacement for6CF6.

No special restrictions are recorded for this substitution.

Specification	Original tube	Replacement
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Sharp Cutoff (single)
Construction	Pentode	Pentode
Base	7CM	7CM
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.3 A

6CE5

Voltage Pentode - Sharp Cutoff (single)

Receiving Tubes

The database records 6CE5 as a possible replacement for6CF6.

Not suitable for all circuits

Specification	Original tube	Replacement
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Sharp Cutoff (single)
Construction	Pentode	Pentode
Base	7CM	7BD
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.3 A

6DC6

Voltage Pentode - Remote Cutoff (single)

Receiving Tubes

The database records 6DC6 as a possible replacement for6CF6.

No special restrictions are recorded for this substitution.

Specification	Original tube	Replacement
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Remote Cutoff (single)
Construction	Pentode	Pentode
Base	7CM	7CM
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.3 A

6DE6

Voltage Pentode - Sharp Cutoff (single)

Receiving Tubes

The database records 6DE6 as a possible replacement for6CF6.

No special restrictions are recorded for this substitution.

Specification	Original tube	Replacement
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Sharp Cutoff (single)
Construction	Pentode	Pentode
Base	7CM	7CM
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.3 A

6DK6

Voltage Pentode - Sharp Cutoff (single)

Receiving Tubes

The database records 6DK6 as a possible replacement for6CF6.

No special restrictions are recorded for this substitution.

Specification	Original tube	Replacement
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Sharp Cutoff (single)
Construction	Pentode	Pentode
Base	7CM	7CM
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.3 A

6HS6

Voltage Radio Detector Converter

Receiving Tubes

The database records 6HS6 as a possible replacement for6CF6.

Parallel heater circuits only
Not suitable for all circuits

Specification	Original tube	Replacement
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Radio Detector Converter
Construction	Pentode	Pentode
Base	7CM	7BK
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.45 A

Where 6CF6 can be used as the replacement

In these recorded relationships, 6CF6 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 6CF6.

6AG5

Voltage Pentode - Sharp Cutoff (single)

Receiving Tubes

The database records 6CF6 as a possible replacement for6AG5.

Not suitable for all circuits

Specification	6CF6 replacement	Original tube
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Sharp Cutoff (single)
Construction	Pentode	Pentode
Base	7CM	E7-1
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.3 A

6AU6

Voltage Pentode - Sharp Cutoff (single)

Receiving Tubes

The database records 6CF6 as a possible replacement for6AU6.

Not suitable for all circuits

Specification	6CF6 replacement	Original tube
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Sharp Cutoff (single)
Construction	Pentode	Pentode
Base	7CM	7BK
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.3 A

6BC5

Voltage Pentode - Sharp Cutoff (single)

Receiving Tubes

The database records 6CF6 as a possible replacement for6BC5.

Not suitable for all circuits

Specification	6CF6 replacement	Original tube
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Sharp Cutoff (single)
Construction	Pentode	Pentode
Base	7CM	7BC
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.6 A

6BH6

Voltage Pentode - Sharp Cutoff (single)

Receiving Tubes

The database records 6CF6 as a possible replacement for6BH6.

Parallel heater circuits only

Specification	6CF6 replacement	Original tube
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Sharp Cutoff (single)
Construction	Pentode	Pentode
Base	7CM	7CM
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.15 A

6CB6

Voltage Pentode

Receiving Tubes

The database records 6CF6 as a possible replacement for6CB6.

No special restrictions are recorded for this substitution.

Specification	6CF6 replacement	Original tube
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode
Construction	Pentode	Pentode
Base	7CM	7CM
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.3 A

6CB6A

Voltage Pentode - Sharp Cutoff (single)

Receiving Tubes

The database records 6CF6 as a possible replacement for6CB6A.

Parallel heater circuits only
No-warmup series circuits only

Specification	6CF6 replacement	Original tube
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Sharp Cutoff (single)
Construction	Pentode	Pentode
Base	7CM	7CM
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.3 A

6DC6

Voltage Pentode - Remote Cutoff (single)

Receiving Tubes

The database records 6CF6 as a possible replacement for6DC6.

No special restrictions are recorded for this substitution.

Specification	6CF6 replacement	Original tube
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Remote Cutoff (single)
Construction	Pentode	Pentode
Base	7CM	7CM
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.3 A

6DE6

Voltage Pentode - Sharp Cutoff (single)

Receiving Tubes

The database records 6CF6 as a possible replacement for6DE6.

No special restrictions are recorded for this substitution.

Specification	6CF6 replacement	Original tube
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Sharp Cutoff (single)
Construction	Pentode	Pentode
Base	7CM	7CM
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.3 A

6DK6

Voltage Pentode - Sharp Cutoff (single)

Receiving Tubes

The database records 6CF6 as a possible replacement for6DK6.

No special restrictions are recorded for this substitution.

Specification	6CF6 replacement	Original tube
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Pentode - Sharp Cutoff (single)
Construction	Pentode	Pentode
Base	7CM	7CM
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.3 A

6HS6

Voltage Radio Detector Converter

Receiving Tubes

The database records 6CF6 as a possible replacement for6HS6.

Parallel heater circuits only
Not suitable for all circuits

Specification	6CF6 replacement	Original tube
Tube type	Voltage Pentode - Sharp Cutoff (single)	Voltage Radio Detector Converter
Construction	Pentode	Pentode
Base	7CM	7BK
Socket	B7G	B7G
Base pins	7	7
Sections	1	1
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.45 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 6CF6 specifications →