Tube cross-reference
2101 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 2101 power - pentode (not beam). Compare core specifications and verify every restriction before using a replacement.
Where 2101 can be used as the replacement
In these recorded relationships, 2101 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 2101.
Power - Pentode Single (NOT beam) (under 10W)
The database records 2101 as a possible replacement for1F4.
No special restrictions are recorded for this substitution.
| Specification | 2101 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Pentode Single (NOT beam) (under 10W) |
| Construction | Pentode | Pentode |
| Base | Not recorded | 5K |
| Socket | Not recorded | UX5 |
| Base pins | Not recorded | 5 |
| Sections | 1 | 1 |
| Heater voltage | 2 V | 2 V |
| Heater current | 0.12 A | 0.12 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 2101 specifications →