Tube cross-reference
PJ8 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the PJ8 power - triode single (under 10w). Compare core specifications and verify every restriction before using a replacement.
Exact variations of PJ8
These designations belong to the same electrical variation group. Their names may differ because of international standards, manufacturing tolerances, or materials, but they are recorded as electrically equivalent—not merely substitutes.
5556 Power - Triode
- Base
- Not recorded
- Socket
- J4
- Base pins
- 4
- Sections
- 1
- Heater voltage
- 4.5 V
- Heater current
- 1.1 A
Where PJ8 can be used as the replacement
In these recorded relationships, PJ8 is the replacement tube. The listed original tubes are not automatically suitable as replacements for PJ8.
Power - Triode
The database records PJ8 as a possible replacement for5556.
No special restrictions are recorded for this substitution.
| Specification | PJ8 replacement | Original tube |
|---|---|---|
| Tube type | Power - Triode Single (under 10W) | Power - Triode |
| Construction | Triode | Triode |
| Base | Not recorded | Not recorded |
| Socket | B4B | J4 |
| Base pins | Not recorded | 4 |
| Sections | 1 | 1 |
| Heater voltage | 4.5 V | 4.5 V |
| Heater current | 1.1 A | 1.1 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 PJ8 specifications →