Tube cross-reference
PL521 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the PL521 power - tv horizontal output (sweep). Compare core specifications and verify every restriction before using a replacement.
Exact variations of PL521
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.
29KQ6 Power - TV Horizontal Output (sweep)
- Base
- 40A
- Socket
- B9D
- Base pins
- 9
- Sections
- 1
- Heater voltage
- 29 V
- Heater current
- 0.3 A
Replacement tubes for PL521
The following tubes are recorded as possible replacements for PL521. This direction does not establish that PL521 can replace them.
Power - TV Horizontal Output (sweep)
The database records 29KQ6 as a possible replacement forPL521.
No special restrictions are recorded for this substitution.
| Specification | Original tube | Replacement |
|---|---|---|
| Tube type | Power - TV Horizontal Output (sweep) | Power - TV Horizontal Output (sweep) |
| Construction | BeamPower | BeamPower |
| Base | 40A | 40A |
| Socket | B9D | B9D |
| Base pins | 9 | 9 |
| Sections | 1 | 1 |
| Heater voltage | 29 V | 29 V |
| Heater current | 0.3 A | 0.3 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 PL521 specifications →