Tube manufacturers
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| Topic | Rating | Hits | Answ. | Author | Last text | Language | |||
| Erste Röhren unter der Marke... | 587 | 1 | Erb, Ernst | Erb, Ernst | 29.Mar.25 |  |
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| Tube maker with initials A I... | 987 | 3 | Schechner, Sara | Holtmann, W. | 06.Jul.23 |  |
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| Circa 1920 tubes | 1306 | 1 | Frister, Max | Löwe, Nikolaus | 25.May.23 | |
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| THE HIRST RESEARCH CENTRE OF... | 1508 | 4 | Stewart, Fin | Stewart, Fin | 15.Jun.22 | |
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| The 'B' rectifier and the bi... | 4958 | 2 | Ciardiello, E. | Ciardiello, E. | 10.Sep.18 | |
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| 1920's tubes made by Philips... | 3711 | 0 | Stewart, Fin | Stewart, Fin | 06.Mar.17 | |
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| Neuer Röhrenhersteller Neolux | 2868 | 3 | Schmidt, H. | Roschy, Jacob | 18.Feb.17 | |
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| FABRICANTE ESPAÑOL WOLEX | 4706 | 2 | Puertas-Pau..., J. | Jung, Otmar | 24.Jul.15 |  |
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| RIA - welche 'Röhren-Firma' ... | 5559 | 5 | Holtzapfel, Jörg | Erb, Ernst | 06.Sep.14 | |
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| The American Shaw Radio Tube... | 5373 | 0 | Stewart, Fin | Stewart, Fin | 04.Aug.14 | |
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| EF 14 Ersatz für VF 14? | 5751 | 3 | Sturm, Roland | Roschy, Jacob | 30.Mar.14 | |
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| Pre WWII miniature tubes | 11492 | 7 | Warnagiris, Tom | Ciardiello, E. | 23.Oct.11 | |
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| Panoramica dei costruttori i... | 16757 | 0 | Ciardiello, E. | Ciardiello, E. | 07.Nov.12 |  |
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| ECC83 mit vergoldetem System | 8101 | 2 | Faulstich, Peter | Faulstich, Peter | 07.Oct.11 | |
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| Buch-Neuerscheinung: Österre... | 7539 | 0 | Lebeth, Thomas | Lebeth, Thomas | 07.Apr.11 | |
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| Weihnachten mit Tungsram | 6510 | 0 | Gareiss, Gerd | Gareiss, Gerd | 18.Dec.10 | |
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| USA tube manufacturer 'NU'? | 8270 | 5 | Linss † 27...., G. | Albrecht, Thomas | 15.Jan.09 | |
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| USA Hersteller "NU"? | 6028 | 2 | Linss † 27...., G. | Linss † 27...., G. | 12.Jan.09 | |
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| Telefunken-Werbeprospekt und... | 7324 | 0 | Keil, Ralf | Keil, Ralf | 11.Apr.07 | |
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| Telefunken Röhrenpreise um 1... | 7497 | 2 | Keil, Ralf | Keil, Ralf | 14.Mar.07 | |
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| British Valve production up ... | 10141 | 16 | Turrill, John | Hippenstiel, Mark | 27.Aug.06 | |
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| Fertigungsdatum Röhren: Tele... | 18081 | 2 | Schmidt, H. | Schmidt, H. | 19.Jul.03 | |
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