Price is for 1 power tube. This is valve made in the 1960s in the United States and branded for PHILIPS. Pretty well-known and widely used.
Tested VERY STRONG as follow:
Ia=52.6ma | S=4.8mA/V
Test under: Uf=6.3V | Ua=250V | Ug1=-12.5V
Where 100% is Ia=45mA | S=3.8mA/V