amical Huit population 2d21 tube chou chinois Lécher la neige
Thyratron - Wikipedia
Vintage 2D21 Vacuum Tube Mixed USA Brands GE Sylvania RCA Thyratron TESTED 5727 | eBay
2D21 Thytron Vacuum Tube. Designed to be used in relay and grid-controlled rectifier applications. MFR: RCA, Westinghouse, Sylvania, GE, Tung Sol, National. SKU: 2D21. New old stock. No longer available for export.
2D21 Mix Audio Vacuum Tube Valve - Bangybang
Vacuum tube types 7036, 2D21, 5696A | 102733525 | Computer History Museum