Tube cross-reference
803 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 803 power - pentode (not beam) (over 1000v 100w). Compare core specifications and verify every restriction before using a replacement.
Where 803 can be used as the replacement
In these recorded relationships, 803 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 803.
Power - Pentode (NOT beam)
The database records 803 as a possible replacement forRK28.
No special restrictions are recorded for this substitution.
| Specification | 803 replacement | Original tube |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) (over 1000V 100W) | Power - Pentode (NOT beam) |
| Construction | Pentode | Pentode |
| Base | Not recorded | Not recorded |
| Socket | GIANT5 | Not recorded |
| Base pins | 5 | Not recorded |
| Sections | 1 | 1 |
| Heater voltage | 10 V | 10 V |
| Heater current | 5 A | 5 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 803 specifications →