Tube cross-reference
28D7 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 28D7 power - beam (not sweep). Compare core specifications and verify every restriction before using a replacement.
Replacement tubes for 28D7
The following tubes are recorded as possible replacements for 28D7. This direction does not establish that 28D7 can replace them.
Power - Beam (NOT sweep)
The database records 28D7W as a possible replacement for28D7.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - Beam (NOT sweep) | Power - Beam (NOT sweep) |
| Construction | BeamPower-BeamPower | BeamPower-BeamPower |
| Base | 8BS | 8BS |
| Socket | Not recorded | Not recorded |
| Base pins | 8 | 8 |
| Sections | 2 | 2 |
| Heater voltage | 28 V | 28 V |
| Heater current | 0.4 A | 0.4 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 28D7 specifications →