Tube cross-reference
77 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 77 voltage radio detector converter. Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 77
The following tubes are recorded as possible replacements for 77. This direction does not establish that 77 can replace them.
Voltage Pentode
The database records 6C6 as a possible replacement for77.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Radio Detector Converter | Voltage Pentode |
| Construction | Pentode | Pentode |
| Base | 8F | 6F |
| Socket | UX6 | UX6 |
| Base pins | 6 | 6 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.3 A | 0.3 A |
Where 77 can be used as the replacement
In these recorded relationships, 77 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 77.
Voltage Pentode - High Frequency (single)
The database records 77 as a possible replacement forCK108.
No special restrictions are recorded for this substitution.
| Specification | 77 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Radio Detector Converter | Voltage Pentode - High Frequency (single) |
| Construction | Pentode | Pentode |
| Base | 8F | Not recorded |
| Socket | UX6 | Not recorded |
| Base pins | 6 | Not recorded |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | Not recorded |
| Heater current | 0.3 A | Not recorded |
Voltage Pentode
The database records 77 as a possible replacement for6C6.
No special restrictions are recorded for this substitution.
| Specification | 77 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Radio Detector Converter | Voltage Pentode |
| Construction | Pentode | Pentode |
| Base | 8F | 6F |
| Socket | UX6 | UX6 |
| Base pins | 6 | 6 |
| 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 77 specifications →