6N2P


The 6N2P,, also sometimes spelled in English "6H2Pi", is a miniature 9-pin dual triode vacuum tube manufactured in USSR, Russia and China with characteristics similar to the RCA 12AX7. The most significant difference between the two is that 6N2P has its two filament elements connected in parallel, unlike the series filament connection of the 12AX7, and it is thus only possible to operate it from a 6.3 volt, 340 mA filament supply The 6N2P also has slightly lower gain than a 12AX7. The 6N2P's slightly lower gain and higher filament draw is similar to the 5751 tube and was sold in quantity to the US military. The 5751 tube may be operated from 6.3 volts at 350 mA for use in avionics.
In the 1970s an improved and more rugged version of the 6N2' was introduced, designated 6N2P-EV. The 5751WA tube is a rugged military version of the 5751, and is the closest equivalent to the 6N2P-EV. Currently, a 12AX7 variant derived from the 6N2P-EV is being produced by Sovtek, under the designation 12AX7WA.
A Chinese version of 6N2P exists, labeled in Latin lettering 6N2.
In the 1990s a line of "Red Bear" guitar amplifiers was being produced in Russia by Novik Ltd. and distributed in the United States by Gibson Guitar Corporation. These amplifiers used 6N2P tubes instead of the much more common 12AX7, prompting user modifications of the amplifier to 12AX7, because the original Russian 6N2P was scarcely available outside of Russia.