| Manufacturer | Part Number | Description |
|---|---|---|
Svetlana |
EL509 | High Performance Beam Power Tetrode |
| Amperex | EL509 | Amperex Tube |
| Unknown Manufacturer | EL509 | High Performance Beam Power Tetrode |
JJ |
EL509 | OUTPUT POWER BEAM PENTODE |
MAZDABELVU |
EL509 | Pentode |
Philips Semiconductors (now NXP Semiconductors) |
EL509 | Line Output Pentode |
