Tube cross-reference
8D3 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 8D3 voltage pentode. Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 8D3
The following tubes are recorded as possible replacements for 8D3. This direction does not establish that 8D3 can replace them.
Voltage Pentode - Sharp Cutoff (single)
The database records 6AM6 as a possible replacement for8D3.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode | Voltage Pentode - Sharp Cutoff (single) |
| Construction | Pentode | Pentode |
| Base | Not recorded | 7DB |
| Socket | B8G | B7G |
| Base pins | 8 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.3 A | 0.3 A |
Where 8D3 can be used as the replacement
In these recorded relationships, 8D3 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 8D3.
Specialized - Switching Tube
The database records 8D3 as a possible replacement for6024.
No special restrictions are recorded for this substitution.
| Specification | 8D3 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode | Specialized - Switching Tube |
| Construction | Pentode | MicrowaveTRSwitch |
| Base | Not recorded | Not recorded |
| Socket | B8G | Not recorded |
| Base pins | 8 | Not recorded |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | Not recorded |
| Heater current | 0.3 A | Not recorded |
Voltage Pentode - High Frequency (single)
The database records 8D3 as a possible replacement for6064.
No special restrictions are recorded for this substitution.
| Specification | 8D3 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode | Voltage Pentode - High Frequency (single) |
| Construction | Pentode | Pentode |
| Base | Not recorded | 7EB |
| Socket | B8G | B7G |
| Base pins | 8 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.3 A | 0.3 A |
Voltage Pentode - Sharp Cutoff (single)
The database records 8D3 as a possible replacement for6AM6.
No special restrictions are recorded for this substitution.
| Specification | 8D3 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode | Voltage Pentode - Sharp Cutoff (single) |
| Construction | Pentode | Pentode |
| Base | Not recorded | 7DB |
| Socket | B8G | B7G |
| Base pins | 8 | 7 |
| Sections | 1 | 1 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.3 A | 0.3 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 8D3 specifications →