GREENSTONE USA
Electron Tubes for Industrial, Broadcast and Military Applications
| 3-500C (graphite) | 3CX1500A7 / 8877 | 3CX2500A3 / 8161 | 3CX2500F3 / 8251 | 3CX3000A1 |
| 3CX3000A7 | 4-400A / 8438 | 4-400C / 6775 | 4-400G (graphite) | 4CX1000A / 8168 |
| 4CX1500A | 4CX1500B / 8660 | 4CX250B / 7203 | 4CX350A / 8321 | 4CX350F / 8322 |
| 572B | 6146B | 807 | 811A | 813 |