Tube cross-reference
3DZ4 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 3DZ4 voltage - triode (single high frequency). Compare core specifications and verify every restriction before using a replacement.
Exact variations of 3DZ4
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.
3AF4 Voltage - Triode (single high frequency)
- Base
- 7DK
- Socket
- B7G
- Base pins
- 7
- Sections
- 1
- Heater voltage
- 3.15 V
- Heater current
- 0.45 A
Where 3DZ4 can be used as the replacement
In these recorded relationships, 3DZ4 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 3DZ4.
Voltage - Triode (single high frequency)
The database records 3DZ4 as a possible replacement for3AF4A.
- Not suitable for all circuits
| Specification | 3DZ4 replacement | Original tube |
|---|---|---|
| Tube type | Voltage - Triode (single high frequency) | Voltage - Triode (single high frequency) |
| Construction | Triode | Triode |
| Base | Not recorded | E7-1 |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 3.2 V | 3.2 V |
| Heater current | 0.45 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 3DZ4 specifications →