Tube cross-reference
1204 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 1204 voltage pentode - sharp cutoff (single). Compare core specifications and verify every restriction before using a replacement.
Exact variations of 1204
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.
7AB7 Voltage Pentode
- Base
- 8BO
- Socket
- B8G
- Base pins
- 8
- Sections
- 1
- Heater voltage
- 7 V
- Heater current
- 0.16 A
Replacement tubes for 1204
The following tubes are recorded as possible replacements for 1204. This direction does not establish that 1204 can replace them.
Voltage Pentode
The database records 7AB7 as a possible replacement for1204.
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 | Not recorded | 8BO |
| Socket | Not recorded | B8G |
| Base pins | 8 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 7 V |
| Heater current | 0.15 A | 0.16 A |
Where 1204 can be used as the replacement
In these recorded relationships, 1204 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 1204.
Voltage Pentode
The database records 1204 as a possible replacement for7AB7.
No special restrictions are recorded for this substitution.
| Specification | 1204 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode - Sharp Cutoff (single) | Voltage Pentode |
| Construction | Pentode | Pentode |
| Base | Not recorded | 8BO |
| Socket | Not recorded | B8G |
| Base pins | 8 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 7 V |
| Heater current | 0.15 A | 0.16 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 1204 specifications →