| Manufacturer | Part Number | Description |
|---|---|---|
Mullard |
ECC33 | Double Triode |
Philips Semiconductors (now NXP Semiconductors) |
ECC33 | Twin Triode |
| Xirun | TECC33A | Surface Mount Transient Voltage Suppressors |
| Xirun | TECC33CA | Surface Mount Transient Voltage Suppressors |
