Vintage Unbranded 2D21 JAN Vacuum Tube NOS/NIB Thyratron 3-Mica Jukebox 5727 USA | 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 tube 2d21 tube | elliott electronic supply
The Thyratron and Using a 2D21 Thyratron to Move Some Current - YouTube
2D21 PL21 Tube Valve Válvula Used Tested TV7/DU Very Good. NO Shorts Gas | eBay
The New Soviet Thyratron Zq3-0.1/1.3 Replacement 2d21 5727 Pl21 Discharge Tube - Fuses - AliExpress