![]() ![]() Using these value in the above formula, the calculated gain is 10. With 12AU7, the plate resistance = 7.2k, tube gain = 17. The gain for this amp can be calculated by this formula : Gain = (Tube Gain x Plate load resistor)/(plate load resistor + plate resistance + ((tube gain +1) * cathode resistor)). I am not going into the details that how the loadline is chosen and how the resistor values are calculated, please reference to my 12AX7 preamp page if you want more information. ![]() ![]() The design is exactly the same as the 12AX7 preamp, it is a single gain stage triode tube with cathode follower. After finished my simple 12AX7 tube preamp, I decided to try other medium mu tubes, including this 12AU7 and also the 6922.
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