Tube cross-reference
1AD4 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 1AD4 voltage pentode or tetrode (under 100v). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 1AD4
The following tubes are recorded as possible replacements for 1AD4. This direction does not establish that 1AD4 can replace them.
Voltage Pentode or Tetrode (under 100V)
The database records DF62 as a possible replacement for1AD4.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode or Tetrode (under 100V) | Voltage Pentode or Tetrode (under 100V) |
| Construction | Pentode | Pentode |
| Base | 1AD4 | SUBMINIATURE |
| Socket | SUBMINIATURE7 | WIRE8 |
| Base pins | 7 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 1.25 V | 1.25 V |
| Heater current | 0.1 A | 0.1 A |
Where 1AD4 can be used as the replacement
In these recorded relationships, 1AD4 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 1AD4.
Voltage Pentode or Tetrode (under 100V)
The database records 1AD4 as a possible replacement forDF62.
No special restrictions are recorded for this substitution.
| Specification | 1AD4 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode or Tetrode (under 100V) | Voltage Pentode or Tetrode (under 100V) |
| Construction | Pentode | Pentode |
| Base | 1AD4 | SUBMINIATURE |
| Socket | SUBMINIATURE7 | WIRE8 |
| Base pins | 7 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 1.25 V | 1.25 V |
| Heater current | 0.1 A | 0.1 A |
Voltage Pentode - Sharp Cutoff (single)
The database records 1AD4 as a possible replacement forDF668.
No special restrictions are recorded for this substitution.
| Specification | 1AD4 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode or Tetrode (under 100V) | Voltage Pentode - Sharp Cutoff (single) |
| Construction | Pentode | Pentode |
| Base | 1AD4 | Not recorded |
| Socket | SUBMINIATURE7 | WIRE8 |
| Base pins | 7 | 8 |
| Sections | 1 | 1 |
| Heater voltage | 1.25 V | 1.25 V |
| Heater current | 0.1 A | 0.1 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 1AD4 specifications →