Tube cross-reference
1F3 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 1F3 voltage pentode - remote cutoff (single). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 1F3
The following tubes are recorded as possible replacements for 1F3. This direction does not establish that 1F3 can replace them.
Voltage Pentode or Tetrode (under 100V)
The database records 1T4 as a possible replacement for1F3.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode - Remote Cutoff (single) | Voltage Pentode or Tetrode (under 100V) |
| Construction | Pentode | Pentode |
| Base | Not recorded | 8AR |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 1.4 V | 1.4 V |
| Heater current | 0.05 A | 0.05 A |
Where 1F3 can be used as the replacement
In these recorded relationships, 1F3 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 1F3.
Voltage Pentode or Tetrode (under 100V)
The database records 1F3 as a possible replacement for1T4.
No special restrictions are recorded for this substitution.
| Specification | 1F3 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode - Remote Cutoff (single) | Voltage Pentode or Tetrode (under 100V) |
| Construction | Pentode | Pentode |
| Base | Not recorded | 8AR |
| Socket | B7G | B7G |
| Base pins | 7 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 1.4 V | 1.4 V |
| Heater current | 0.05 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 1F3 specifications →