VACUUM TUBE: 5727/2D21 GE or PHILIPS NEW NIB GAS THYRATRON 7-pin-miniature | eBay
RCA JAN-5727 Vintage Electron Vacuum Tube | eBay
5727 @ The Valve Museum
PHILIPS JAN-5727 Vintage Electron Vacuum Tube NSN 5960-00-552-0082 | eBay
The New Soviet Thyratron Zq3-0.1/1.3 Replacement 2d21 5727 Pl21 Discharge Tube - Fuses - AliExpress
Tutta Elettronica di A. Capponi
Free Shipping France 5727 Vacuum Tube Amplifier Can Replace 2d21 Zq3-0.1/1.3 Spark Tube High Frequency Heat Sealing Machine Use - Contactors - AliExpress
5727 Thyratron. A cold cathode tube by Valvo, print blue. ID18340: Amazon.de: Electronics & Photo
CK 5727, Tube CK5727; Röhre CK 5727 ID35843, Thyratron | Radiomuseum.org