Tube cross-reference
RK28 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the RK28 power - pentode (not beam). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for RK28
The following tubes are recorded as possible replacements for RK28. This direction does not establish that RK28 can replace them.
Power - Pentode (NOT beam) (over 1000V 100W)
The database records 803 as a possible replacement forRK28.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Pentode (NOT beam) | Power - Pentode (NOT beam) (over 1000V 100W) |
| Construction | Pentode | Pentode |
| Base | Not recorded | Not recorded |
| Socket | Not recorded | GIANT5 |
| Base pins | Not recorded | 5 |
| 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 RK28 specifications →