Röhrenmarken / Tube Brands noch in Arbeit / still under construction
| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
| CARDON |
| CECILIAN |
| CE CO |
| CETRON |
| CHAMPION |
| CLARITRON |
| CLEARTONE |
| CLEARTRON |
| COLUNBIATRON |
| CONCERT MASTER |
| CONNECTICUT |
| CONTINENTAL |
| CORONADO |
| CROSSLEY |
| CROYDEN |
| CROYDON |
| CRUSADER |
| COSMOS |
| COSSOR |
| C.S.F. |
| CUNNINGHAM |
| CERBERUS |