6N1 vacuum tube military grade class J .6N1 electronic tube substitutionECC85/6H1n/6AQ8/6N1-M/6N1-Q .For audio power amplifier enhance sound quality. Electronic tube has a strong load capacity, and its linear performance is better than that of the transistor. It plays an irreplaceable role in the work of high frequency and high power.Size : length 49 mm , width 22mm . pin 7mm.Package : 2pcs .