6N1P and 6N2P was / are the most popular small signal twin triodes in Russian audio. They was thought as 9 pin replacements for octal 6H8C (6SN7 GT) and 6H9C (6SL7 GT) respectively. Both have built - in shield. Great tubes with great sound.
In the following notes a number of typical circuits in which both 6N1P and 6N2P can be employed as amplifier and fase inverter are described.
fig1 shows standard line stage amplifier. You can obtain aprox. 9V (12V for 6N2P) output with THD less than 0,1%. Aprox. gain will be 20 - 25 (50 for 6N2P).

fig2, fig3 and fig4 show standard fase inverters. Aprox gain is 60 for fig2 and 30 for fig3.