This top-of-the-line headphone-speaker amp is designed with exceptional custom parts, painstakingly tested in the Eddie Current lab to provide the very best sound stage for pure listening pleasure, delivering a natural and lively sound, and balanced listening. It will superbly drive planar magnetic headphones as well as speakers without compromising your headphone enjoyment.
Studio Amplifier Theory of Operation
The Studio amplifier is Eddie Current's flagship entry into the professional market. It is a true single ended vacuum tube headphone/speaker amplifier.
Parallel 2A3 output tubes are transformer plate loaded to create one massive SE triode output device. The output transformer has three separate windings. Primary, secondary, and tertiary. The tertiary winding is a small number of turns close to the transformer core. This winding cancels non linearity (distortion) inherent in all magnetic devices.
Signal flow is from balanced 600 ohm input transformer, or single ended RCA jack. Either input is selected with a silver contact front panel toggle switch, then goes to the volume control, and on to the grid of a high trans-conductance transformer plate loaded 5842Q/417A triode. This transformer uses a nano crystalline core material that has virtually no hysteresis. This means you hear the tube not the transformer. This topology also transfers maximum power to the grids of the output tubes with far greater speed than any coupling capacitor could manage. In other words no coupling caps in the signal path.
Lastly the output 2A3 tube heaters are the cathodes. This means that any AC voltage, or power supply noise that cannot be null-ed out will be heard from the amplifier. DC on the heater is the common, and easy solution to prevent noise. Unfortunately for the tube to operate at peak performance requires an even electron cloud inside the tube for the grid, plate and cathode to work with.
The Studio amplifier employs as it's heater drive circuit a low distortion Wien Bridge sine wave oscillator operating at 46kHz. This feeds a power amplifier which drives custom wound isolation transformers. These transformer isolate the drive circuit, and provide precise center taps. This drive scheme produces a perfect electron cloud inside the output tubes.
This combination taken as a whole makes a low distortion SE tube amplifier with incredibly transparent and deep sound stage.
Because of its hard-to-source components, a limited number of Studios are being made. The Studio is guaranteed to be a unique investment in audio.
Plus shipping. 2A3 tubes not included.