Electron tube 6N15P (6H15П) is a small soviet double triode with indirectly heated oxide-coated cathode, which was designed for use in high-frequency stages. It is direct replacement for the 6CC31 from manufacturer Tesla (former Czechoslovakia), european ECC91 and also the american 6J6. Service life: not less than 500 operating hours under prescribed conditions. New in box tubes made in the 80's (please look at the gallery pictures).