Tube cross-reference
3Q4 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 3Q4 power - pentode single (not beam) (under 10w). Compare core specifications and verify every restriction before using a replacement.
Exact variations of 3Q4
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.
DL95 Power - Pentode Single (NOT beam) (under 10W)
- Base
- Miniature
- Socket
- B7G
- Base pins
- 7
- Sections
- 1
- Heater voltage
- 1.4 V
- Heater current
- 0.1 A
Replacement tubes for 3Q4
The following tubes are recorded as possible replacements for 3Q4. This direction does not establish that 3Q4 can replace them.
Power - Pentode Single (NOT beam) (under 10W)
The database records DL95 as a possible replacement for3Q4.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode Single (NOT beam) (under 10W) | Power - Pentode Single (NOT beam) (under 10W) |
| Construction | Pentode | Pentode |
| Base | 7BA | Miniature |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 2.8 V | 1.4 V |
| Heater current | 0.05 A | 0.1 A |
Power - Pentode (NOT beam)
The database records N18 as a possible replacement for3Q4.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode Single (NOT beam) (under 10W) | Power - Pentode (NOT beam) |
| Construction | Pentode | Pentode |
| Base | 7BA | Not recorded |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 2.8 V | 2.8 V |
| Heater current | 0.05 A | 0.05 A |
Power - Pentode Single (NOT beam) (under 10W)
The database records 3S4 as a possible replacement for3Q4.
- Not suitable for all circuits
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode Single (NOT beam) (under 10W) | Power - Pentode Single (NOT beam) (under 10W) |
| Construction | Pentode | Pentode |
| Base | 7BA | 7BA |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 2.8 V | 2.8 V |
| Heater current | 0.05 A | 0.05 A |
Where 3Q4 can be used as the replacement
In these recorded relationships, 3Q4 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 3Q4.
Power - Pentode Single (NOT beam) (under 10W)
The database records 3Q4 as a possible replacement forDL95.
No special restrictions are recorded for this substitution.
| Specification | 3Q4 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode Single (NOT beam) (under 10W) | Power - Pentode Single (NOT beam) (under 10W) |
| Construction | Pentode | Pentode |
| Base | 7BA | Miniature |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 2.8 V | 1.4 V |
| Heater current | 0.05 A | 0.1 A |
Power - Pentode (NOT beam)
The database records 3Q4 as a possible replacement forN18.
No special restrictions are recorded for this substitution.
| Specification | 3Q4 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode Single (NOT beam) (under 10W) | Power - Pentode (NOT beam) |
| Construction | Pentode | Pentode |
| Base | 7BA | Not recorded |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 2.8 V | 2.8 V |
| Heater current | 0.05 A | 0.05 A |
Power - Pentode Single (NOT beam) (under 10W)
The database records 3Q4 as a possible replacement for3S4.
- Not suitable for all circuits
| Specification | 3Q4 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode Single (NOT beam) (under 10W) | Power - Pentode Single (NOT beam) (under 10W) |
| Construction | Pentode | Pentode |
| Base | 7BA | 7BA |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 2.8 V | 2.8 V |
| Heater current | 0.05 A | 0.05 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 3Q4 specifications →