Tube cross-reference
6HJ8 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 6HJ8 voltage pentode or tetrode (with diode). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 6HJ8
The following tubes are recorded as possible replacements for 6HJ8. This direction does not establish that 6HJ8 can replace them.
Voltage Pentode or Tetrode (with diode)
The database records 6AM8 as a possible replacement for6HJ8.
- Parallel heater circuits only
- No-warmup series circuits only
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode or Tetrode (with diode) | Voltage Pentode or Tetrode (with diode) |
| Construction | Diode-Pentode | Diode-Pentode |
| Base | 9CY | 9CY |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.45 A | 0.45 A |
Voltage Pentode or Tetrode (with diode)
The database records 6AM8A as a possible replacement for6HJ8.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Voltage Pentode or Tetrode (with diode) | Voltage Pentode or Tetrode (with diode) |
| Construction | Diode-Pentode | Diode-Pentode |
| Base | 9CY | 9CY |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.45 A | 0.45 A |
Where 6HJ8 can be used as the replacement
In these recorded relationships, 6HJ8 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 6HJ8.
Voltage Pentode or Tetrode (with diode)
The database records 6HJ8 as a possible replacement for6AM8.
No special restrictions are recorded for this substitution.
| Specification | 6HJ8 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode or Tetrode (with diode) | Voltage Pentode or Tetrode (with diode) |
| Construction | Diode-Pentode | Diode-Pentode |
| Base | 9CY | 9CY |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.45 A | 0.45 A |
Voltage Pentode or Tetrode (with diode)
The database records 6HJ8 as a possible replacement for6AM8A.
No special restrictions are recorded for this substitution.
| Specification | 6HJ8 replacement | Original tube |
|---|---|---|
| Tube type | Voltage Pentode or Tetrode (with diode) | Voltage Pentode or Tetrode (with diode) |
| Construction | Diode-Pentode | Diode-Pentode |
| Base | 9CY | 9CY |
| Socket | B9A | B9A |
| Base pins | 9 | 9 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 0.45 A | 0.45 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 6HJ8 specifications →