Tube cross-reference
Z77 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the Z77 voltage radio detector converter. Compare core specifications and verify every restriction before using a replacement.
Exact variations of Z77
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.
6AM6 Voltage Pentode - Sharp Cutoff (single)
- Base
- 7DB
- Socket
- B7G
- Base pins
- 7
- Sections
- 1
- Heater voltage
- 6.3 V
- Heater current
- 0.3 A
6F12 Voltage Pentode - High Frequency (single)
- Base
- Not recorded
- Socket
- Not recorded
- Base pins
- Not recorded
- Sections
- 1
- Heater voltage
- 6.3 V
- Heater current
- 0.3 A
EF91 Voltage Pentode - Sharp Cutoff (single)
- Base
- B7G
- Socket
- B7G
- Base pins
- 7
- Sections
- 1
- Heater voltage
- 6.3 V
- Heater current
- 0.3 A
Replacement tubes for Z77
The following tubes are recorded as possible replacements for Z77. This direction does not establish that Z77 can replace them.
Voltage Pentode - Sharp Cutoff (single)
The database records 6AM6 as a possible replacement forZ77.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Radio Detector Converter | Voltage Pentode - Sharp Cutoff (single) |
| Construction | Pentode | Pentode |
| Base | B7G | 7DB |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.3 A | 0.3 A |
Where Z77 can be used as the replacement
In these recorded relationships, Z77 is the replacement tube. The listed original tubes are not automatically suitable as replacements for Z77.
Specialized - Switching Tube
The database records Z77 as a possible replacement for6024.
No special restrictions are recorded for this substitution.
| Specification | Z77 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Radio Detector Converter | Specialized - Switching Tube |
| Construction | Pentode | MicrowaveTRSwitch |
| Base | B7G | Not recorded |
| Socket | B7G | Not recorded |
| Base pins | 7 | Not recorded |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | Not recorded |
| Heater current | 0.3 A | Not recorded |
Voltage Pentode - High Frequency (single)
The database records Z77 as a possible replacement for6064.
No special restrictions are recorded for this substitution.
| Specification | Z77 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Radio Detector Converter | Voltage Pentode - High Frequency (single) |
| Construction | Pentode | Pentode |
| Base | B7G | 7EB |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.3 A | 0.3 A |
Voltage Pentode - Sharp Cutoff (single)
The database records Z77 as a possible replacement for6AM6.
No special restrictions are recorded for this substitution.
| Specification | Z77 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Radio Detector Converter | Voltage Pentode - Sharp Cutoff (single) |
| Construction | Pentode | Pentode |
| Base | B7G | 7DB |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.3 A | 0.3 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 Z77 specifications →