Tube cross-reference
3B4 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 3B4 power - pentode single (not beam) (under 10w). Compare core specifications and verify every restriction before using a replacement.
Exact variations of 3B4
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.
DL98 Voltage Pentode
- Base
- Not recorded
- Socket
- WIRE8
- Base pins
- 8
- Sections
- 1
- Heater voltage
- 1.25 V
- Heater current
- 0.33 A
Replacement tubes for 3B4
The following tubes are recorded as possible replacements for 3B4. This direction does not establish that 3B4 can replace them.
Voltage Pentode
The database records DL98 as a possible replacement for3B4.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode Single (NOT beam) (under 10W) | Voltage Pentode |
| Construction | Pentode | Pentode |
| Base | 7CY | Not recorded |
| Socket | B7G | WIRE8 |
| Base pins | 7 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 1.25 V | 1.25 V |
| Heater current | 0.33 A | 0.33 A |
Where 3B4 can be used as the replacement
In these recorded relationships, 3B4 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 3B4.
Voltage Pentode
The database records 3B4 as a possible replacement forDL98.
No special restrictions are recorded for this substitution.
| Specification | 3B4 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode Single (NOT beam) (under 10W) | Voltage Pentode |
| Construction | Pentode | Pentode |
| Base | 7CY | Not recorded |
| Socket | B7G | WIRE8 |
| Base pins | 7 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 1.25 V | 1.25 V |
| Heater current | 0.33 A | 0.33 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 3B4 specifications →