Tube cross-reference
1644 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 1644 power - pentode (not beam). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 1644
The following tubes are recorded as possible replacements for 1644. This direction does not establish that 1644 can replace them.
Voltage Radio Detector Converter
The database records 12L8GT as a possible replacement for1644.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Voltage Radio Detector Converter |
| Construction | Pentode-Pentode | Diode-Pentode |
| Base | 8BU | 8BU |
| Socket | Not recorded | IO |
| Base pins | 8 | 8 |
| Sections | 2 | 2 |
| Heater voltage | 12.6 V | 12.6 V |
| Heater current | 0.15 A | 0.15 A |
Where 1644 can be used as the replacement
In these recorded relationships, 1644 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 1644.
Voltage Radio Detector Converter
The database records 1644 as a possible replacement for12L8GT.
No special restrictions are recorded for this substitution.
| Specification | 1644 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Voltage Radio Detector Converter |
| Construction | Pentode-Pentode | Diode-Pentode |
| Base | 8BU | 8BU |
| Socket | Not recorded | IO |
| Base pins | 8 | 8 |
| Sections | 2 | 2 |
| 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 1644 specifications →