This is one of the semiconductor types.
This part name is D2499, 2SD2499.
This product has Horizontal Deflection Output For Color TV functions.
Manufacturers of product is Toshiba.
Some of the text files within the PDF file :
1. High Voltage : Vcbo = 1500V
2. Low Saturation Voltage : Vce(sat) = 5V (Max.)
3. High Speed : tf = 0.3us (Typ.)
4. Built-in Damper Type
5. Collector Metal (Fin) is Fully Covered with Mold Resin.
Toshiba Transistor Silicon NPN Triple Diffused Mesa Type