1940's Rare X-ray Vacuum Tube Museum Quality BR-237 VIII-60 Rare

New old stock.Does not come in original factory box.1940's Rare X-ray Vacuum Tube Museum Quality BR-237 VIII-60 Rare.The BR-237-III-60 is a specialized high-voltage vacuum tube designed for diagnostic X-ray applications, specifically within the medical and industrial imaging sectors. This tube is a rotating anode X-ray tube, which is a design utilized to handle the intense heat generated when high-velocity electrons strike the target material. By rotating the anode, the electron beam constantly hits a fresh area of the target, allowing for higher power levels and shorter exposure times without melting the focal spot.
Museum Quality

The technical specifications for the BR-237-III-60 are defined by its electrical capacity, thermal management, and physical focal spot dimensions. The "60" in the designation typically refers to the maximum peak kilovoltage 

 Depending on the manufacturer's nomenclature, though in this specific series, it often denotes a maximum operating voltage of 150 kV and a focal spot size of 0.6 mm / 1.2 mm.

Electrical and Thermal Specifications
The tube operates by accelerating electrons from a heated filament (cathode) toward a tungsten-rhenium alloy target (anode). The primary specifications include:

Maximum Tube Voltage: 150 kV, allowing for deep penetration in dense tissue or industrial materials.
Focal Spot Sizes: This is a dual-focus tube with a small focal spot of 0.6 mm (for high-resolution imaging) and a large focal spot of 1.2 mm (for high-power exposures).
Anode Heat Storage Capacity: Approximately 300,000 to 400,000 Heat Units (HU), which determines how many consecutive exposures can be made before the tube requires a cooling interval.
Anode Rotation Speed: Standard speed of 3,000 to 3,600 RPM at 60 Hz, or high-speed rotation up to 10,000 RPM for increased power loading.
Physical Construction
The BR-237-III-60 features a glass or ceramic envelope to maintain a high vacuum, which is essential to prevent ionization of residual gas that would interfere with the electron stream. The anode target angle is typically between 12° and 15°, a design choice that balances the "line-focus principle" to provide a small effective focal spot while maintaining a large actual area for heat dissipation. The tube is usually housed in a lead-lined protective casing filled with dielectric oil, which serves both as an electrical insulator and a cooling medium to transfer heat away from the vacuum insert.