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 |
| McCullough |
| MAGICTRON |
| MAGNATRON |
| MAGNAVOX |
| MAJESTIC |
| MARATHON |
| MARGO |
| MARVIN |
| MASTERTONE |
| MECO |
| MELOPHONIC |
| MICROTUBE |
| MILO |
| MINUET |
| MIZPAH |
| MODERN |
| MONOTRON |
| MURDON |
| MUSIKTRON |
| MUSSELMAN |
| MUZADA |
| MYERS |
| MUELLER RRF |
| MULLARD |
| METROVICK |
| METAL |
| MICROMESH |
| MARCONI |
| MARCONI-OSRAM |
| MARS |
| MICRO METAL |
| MAZDA |