Tube cross-reference
EF70 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the EF70 voltage pentode - high frequency (single). Compare core specifications and verify every restriction before using a replacement.
Exact variations of EF70
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.
6487 Voltage Pentode or Tetrode (with diode)
- Base
- 8FW
- Socket
- Not recorded
- Base pins
- 8
- Sections
- 2
- Heater voltage
- 6.3 V
- Heater current
- 0.2 A
Replacement tubes for EF70
The following tubes are recorded as possible replacements for EF70. This direction does not establish that EF70 can replace them.
Voltage Pentode or Tetrode (with diode)
The database records 6487 as a possible replacement forEF70.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode - High Frequency (single) | Voltage Pentode or Tetrode (with diode) |
| Construction | Pentode | Diode-Pentode |
| Base | Not recorded | 8FW |
| Socket | WIRE8 | Not recorded |
| Base pins | 8 | 8 |
| Sections | 1 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.2 A | 0.2 A |
Where EF70 can be used as the replacement
In these recorded relationships, EF70 is the replacement tube. The listed original tubes are not automatically suitable as replacements for EF70.
Voltage Pentode or Tetrode (with diode)
The database records EF70 as a possible replacement for6487.
No special restrictions are recorded for this substitution.
| Specification | EF70 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode - High Frequency (single) | Voltage Pentode or Tetrode (with diode) |
| Construction | Pentode | Diode-Pentode |
| Base | Not recorded | 8FW |
| Socket | WIRE8 | Not recorded |
| Base pins | 8 | 8 |
| Sections | 1 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.2 A | 0.2 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 EF70 specifications →