D: Radio Catalog for the radio manufacturer Hegra, Hekra, (Marke), Hermann Grau, Berlin-Friedrichshagen - Vorkrieg
| Model | Year | Category | Tubes | Pictures | Forum | Coll.Pr. | ||
|---|---|---|---|---|---|---|---|---|
| Speaker DRI r93 | 1937 ? | Speaker-P | 9 |  |
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| Volldynamischer Lautsprecher B16/2 [Gleichstrom] | 1932/33 | Speaker-P | 1 | |
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| Volldynamischer Lautsprecher B16/2 [Wechselstrom] | 1932/33 | Speaker-P | ||||||
| 4-Polsystem E | 1933 ? | Speaker-P | 1 | |
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| Kabinett-Lautsprecher Anleitung zum Selbstbau | 1928 ? | Kit | 4 | |
2S | |||
| Hegra Tonabnehmer Form C | 1931 ?? | Microphone/PU | 2 | |
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| Schalldose Form A | 1929 | Microphone/PU | 1 | |
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| Schalldose Form B | 1929 | Microphone/PU | 1 | |
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| Tonarm mit Dose | 1931 ?? | Microphone/PU | 2 | |
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| Tonsender | 1935 | Morse+TTY | 10 | |
$ | |||
| Lautstärkeregler | 1934 | mod-past25 | 1 | |
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| Ladegleichrichter TG 110 | 1929–31 | Power-S | 3 | |
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| Ladegleichrichter TG 220 | 1929–31 | Power-S | 5 | |
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| Röhrengleichrichter URAN-EG50 | 1932 | Power-S | 1 - EG50 | 1 | |
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| Röhrengleichrichter URAN-EG100 | 1932 | Power-S | 1 - EG100 | 1 | |
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| Ankersystem Form C | 1928–31 | Radio part | 3 | |
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| Ankersystem Form D | 1929 | Radio part | 1 | |
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| Ankersystem Form E | 1931 | Radio part | 1 | |
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| Tarno Heizregelwiderstand | 1925 | Radio part | 4 | |
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