How is the filament of a fluorescent tube heated at the beginning for glowing the tube, when the starter has a normally open contact? - Quora
![DollaTek 5m Pack Blue Feed Tube Ptfe Tube für 3D-Drucker 1.75 mm Filament : Amazon.de: Gewerbe, Industrie & Wissenschaft DollaTek 5m Pack Blue Feed Tube Ptfe Tube für 3D-Drucker 1.75 mm Filament : Amazon.de: Gewerbe, Industrie & Wissenschaft](https://m.media-amazon.com/images/I/717QC9XpQNL._AC_UF894,1000_QL80_.jpg)
DollaTek 5m Pack Blue Feed Tube Ptfe Tube für 3D-Drucker 1.75 mm Filament : Amazon.de: Gewerbe, Industrie & Wissenschaft
![Kurt J. Lesker Company | Replacement Ion (Hot Filament) Gauge Tubes | Enabling Technology for a Better World Kurt J. Lesker Company | Replacement Ion (Hot Filament) Gauge Tubes | Enabling Technology for a Better World](https://www.lesker.com/newweb/images/product_photos/Photo-IG-G075N_std.jpg)
Kurt J. Lesker Company | Replacement Ion (Hot Filament) Gauge Tubes | Enabling Technology for a Better World
![Douk Audio HiFi Hohe Spannung Filament Filter Mini Power Supply Board für Tube Preamp/Power Verstärker|6z4 tube|tube amplifier nobsoundtube power supplies - AliExpress Douk Audio HiFi Hohe Spannung Filament Filter Mini Power Supply Board für Tube Preamp/Power Verstärker|6z4 tube|tube amplifier nobsoundtube power supplies - AliExpress](https://ae01.alicdn.com/kf/Sde7eb329ec874430a5ad604c77b2265cl/Douk-Audio-HiFi-Hohe-Spannung-Filament-Filter-Mini-Power-Supply-Board-f-r-Tube-Preamp-Power.jpg_Q90.jpg_.webp)