Tube cross-reference
1H33 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 1H33 voltage pentode or tetrode (under 100v). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 1H33
The following tubes are recorded as possible replacements for 1H33. This direction does not establish that 1H33 can replace them.
Voltage Pentode or Tetrode (under 100V)
The database records 1R5 as a possible replacement for1H33.
- Parallel heater circuits only
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode or Tetrode (under 100V) | Voltage Pentode or Tetrode (under 100V) |
| Construction | Heptode | Heptode |
| Base | Not recorded | 7AT |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 1.4 V | 1.4 V |
| Heater current | 0.025 A | 0.05 A |
Where 1H33 can be used as the replacement
In these recorded relationships, 1H33 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 1H33.
Voltage Pentode or Tetrode (under 100V)
The database records 1H33 as a possible replacement for1R5.
- Parallel heater circuits only
| Specification | 1H33 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode or Tetrode (under 100V) | Voltage Pentode or Tetrode (under 100V) |
| Construction | Heptode | Heptode |
| Base | Not recorded | 7AT |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 1.4 V | 1.4 V |
| Heater current | 0.025 A | 0.05 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 1H33 specifications →