Tube cross-reference
42 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 42 power - pentode (not beam). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 42
The following tubes are recorded as possible replacements for 42. This direction does not establish that 42 can replace them.
Power - Pentode (NOT beam)
The database records 41 as a possible replacement for42.
- Parallel heater circuits only
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Pentode (NOT beam) |
| Construction | Pentode | Pentode |
| Base | 6B | 6B |
| Socket | B6 | B6 |
| Base pins | 6 | 6 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.7 A | 0.4 A |
Where 42 can be used as the replacement
In these recorded relationships, 42 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 42.
Power - Pentode (NOT beam)
The database records 42 as a possible replacement for41.
- Parallel heater circuits only
| Specification | 42 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Pentode (NOT beam) |
| Construction | Pentode | Pentode |
| Base | 6B | 6B |
| Socket | B6 | B6 |
| Base pins | 6 | 6 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.7 A | 0.4 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 42 specifications →