Tube cross-reference
21EX6 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 21EX6 power - tv horizontal output (sweep). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 21EX6
The following tubes are recorded as possible replacements for 21EX6. This direction does not establish that 21EX6 can replace them.
Power - TV Horizontal Output (sweep)
The database records 25CD6GB as a possible replacement for21EX6.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - TV Horizontal Output (sweep) | Power - TV Horizontal Output (sweep) |
| Construction | BeamPower | BeamPower |
| Base | Not recorded | Not recorded |
| Socket | B9E | IO |
| Base pins | 12 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 21.5 V | 25 V |
| Heater current | 0.6 A | 0.6 A |
Where 21EX6 can be used as the replacement
In these recorded relationships, 21EX6 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 21EX6.
Power - TV Horizontal Output (sweep)
The database records 21EX6 as a possible replacement for25CD6G.
No special restrictions are recorded for this substitution.
| Specification | 21EX6 replacement | Original tube |
|---|---|---|
| Tube type | Power - TV Horizontal Output (sweep) | Power - TV Horizontal Output (sweep) |
| Construction | BeamPower | BeamPower |
| Base | Not recorded | 5BT |
| Socket | B9E | Not recorded |
| Base pins | 12 | Not recorded |
| Sections | 1 | 1 |
| Heater voltage | 21.5 V | 25 V |
| Heater current | 0.6 A | 0.6 A |
Power - TV Horizontal Output (sweep)
The database records 21EX6 as a possible replacement for25CD6GA.
No special restrictions are recorded for this substitution.
| Specification | 21EX6 replacement | Original tube |
|---|---|---|
| Tube type | Power - TV Horizontal Output (sweep) | Power - TV Horizontal Output (sweep) |
| Construction | BeamPower | BeamPower |
| Base | Not recorded | 5BT |
| Socket | B9E | Not recorded |
| Base pins | 12 | Not recorded |
| Sections | 1 | 1 |
| Heater voltage | 21.5 V | 25 V |
| Heater current | 0.6 A | 0.6 A |
Power - TV Horizontal Output (sweep)
The database records 21EX6 as a possible replacement for25CD6GB.
No special restrictions are recorded for this substitution.
| Specification | 21EX6 replacement | Original tube |
|---|---|---|
| Tube type | Power - TV Horizontal Output (sweep) | Power - TV Horizontal Output (sweep) |
| Construction | BeamPower | BeamPower |
| Base | Not recorded | Not recorded |
| Socket | B9E | IO |
| Base pins | 12 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 21.5 V | 25 V |
| Heater current | 0.6 A | 0.6 A |
Power - TV Horizontal Output (sweep)
The database records 21EX6 as a possible replacement for25DN6.
No special restrictions are recorded for this substitution.
| Specification | 21EX6 replacement | Original tube |
|---|---|---|
| Tube type | Power - TV Horizontal Output (sweep) | Power - TV Horizontal Output (sweep) |
| Construction | BeamPower | BeamPower |
| Base | Not recorded | B8-118 |
| Socket | B9E | B9A |
| Base pins | 12 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 21.5 V | 25 V |
| Heater current | 0.6 A | 0.6 A |
Power - TV Horizontal Output (sweep)
The database records 21EX6 as a possible replacement for25EC6.
No special restrictions are recorded for this substitution.
| Specification | 21EX6 replacement | Original tube |
|---|---|---|
| Tube type | Power - TV Horizontal Output (sweep) | Power - TV Horizontal Output (sweep) |
| Construction | BeamPower | BeamPower |
| Base | Not recorded | B8-110 |
| Socket | B9E | B9A |
| Base pins | 12 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 21.5 V | 25 V |
| Heater current | 0.6 A | 0.6 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 21EX6 specifications →