Vacuum tube amp schematic4/6/2024 ![]() To eliminate these problems, I worked with the same parameters in both channels. On the other hand, the existence of noise (e.g., hum and RF that pass to the final gain stage) also affects the amplifier’s sound and produces noise or a harsh sound. That is the point that affects the sound quality (e.g., big sound stage, rich musicality, and transparency). These circuits enable DC and AC signals to be passed to the power gain stage’s grid because there is no coupling capacitor in the signal path. The direct-coupling circuit seems easy to implement, but it is not. There was no capacitor or coupling transformer between the driver and the power stages. For the record, the “Loftin-White” prototype amplifier containing this circuit design used the 224 tetrode in the driver stage and the 250 triode in the power (output) stage. White in the American magazine Radio News. Loftin and White wrote of an amplifier design, with a direct-coupled circuit. The first information concerning the Loftin-White circuit was published by E. I discovered the Loftin-White circuit while I was looking for a simple single-ended tube (SET) design of a high-quality valve amplifier based on a 2A3 direct-heated triode (DHT) vacuum power tube. Photo 1: This is a top view of the 2A3 tube amp, shown with the power tubes glowing blue. ![]()
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