Tube cross-reference
12C8 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 12C8 voltage radio detector converter. Compare core specifications and verify every restriction before using a replacement.
Exact variations of 12C8
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.
Replacement tubes for 12C8
The following tubes are recorded as possible replacements for 12C8. This direction does not establish that 12C8 can replace them.
Rectifier - Half Wave
The database records 1664 as a possible replacement for12C8.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Radio Detector Converter | Rectifier - Half Wave |
| Construction | Diode-Diode-Pentode | Rectifier |
| Base | 8E | 2Z |
| Socket | Not recorded | Not recorded |
| Base pins | 8 | 2 |
| Sections | 3 | 1 |
| Heater voltage | 12.6 V | 1.4 V |
| Heater current | 0.15 A | 0.05 A |
Voltage Pentode or Tetrode (with diode)
The database records 5660 as a possible replacement for12C8.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Radio Detector Converter | Voltage Pentode or Tetrode (with diode) |
| Construction | Diode-Diode-Pentode | Diode-Diode-Pentode |
| Base | 8E | Not recorded |
| Socket | Not recorded | Not recorded |
| Base pins | 8 | 8 |
| Sections | 3 | 3 |
| Heater voltage | 12.6 V | 12.6 V |
| Heater current | 0.15 A | 0.15 A |
Where 12C8 can be used as the replacement
In these recorded relationships, 12C8 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 12C8.
Rectifier - Half Wave
The database records 12C8 as a possible replacement for1664.
No special restrictions are recorded for this substitution.
| Specification | 12C8 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Radio Detector Converter | Rectifier - Half Wave |
| Construction | Diode-Diode-Pentode | Rectifier |
| Base | 8E | 2Z |
| Socket | Not recorded | Not recorded |
| Base pins | 8 | 2 |
| Sections | 3 | 1 |
| Heater voltage | 12.6 V | 1.4 V |
| Heater current | 0.15 A | 0.05 A |
Voltage Pentode or Tetrode (with diode)
The database records 12C8 as a possible replacement for5660.
No special restrictions are recorded for this substitution.
| Specification | 12C8 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Radio Detector Converter | Voltage Pentode or Tetrode (with diode) |
| Construction | Diode-Diode-Pentode | Diode-Diode-Pentode |
| Base | 8E | Not recorded |
| Socket | Not recorded | Not recorded |
| Base pins | 8 | 8 |
| Sections | 3 | 3 |
| Heater voltage | 12.6 V | 12.6 V |
| Heater current | 0.15 A | 0.15 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 12C8 specifications →