VFET amplifier "Mercury MkII"
This amplifier utilizes VFET (Vertical Channel Field-Effect) transistors known to have similar characteristics as vacuum tubes.
This amplifier was first ment to be used with power demanding planar magnetic headphones like Audeze, but it showed very nice capabilities and sound of class-A also to drive loudspeakers.
Nixie indicator showing selected input gives a nice retro touch as do also a VLC output indicator.
The amplifier is usable as power amplifier or stand alone due to 4 inputs and inner volume potentiometer with remote control.
And yes, there is this certain fluidum about those VFet's: sound is smooth and fluvial like mercury.
Advantages of using VFET (V-FET, VJFET, SIT) in audio could be seen for three main characteristics:
1. output curves similar to triode tubes with high linearity and absence of the phenomenon of saturation characteristics.
2. parasitic capacities significantly lower than other solid-state devices of similar power that would have resulted in a much higher operation band.
3. the VFET device, unlike all others, never turned off completely, so it exhibits a significant advantage, because here the switching distortion is absent.
Output power: 2 x 16W sin @8 Ohm / 2x 20W sin. @4 Ohm.
Input signal: 1V
Volume adjustment: integrated potentiometer (Alps)
Input impedance: 50k Ohm
Suitable for speakers: 16/8/4 Ohm
Inputs: 4x RCA
Nixie indicator shows selected input
Outputs for headphones: 1/4"(6.35mm) Jack and XLR-4 sockets
Outputs: Banana sockets
VCL output indicator
Remote control: YES
Power consumption: 200W
Frequency band: 10Hz-50kHz +/-0.13dB
Transistors, front end: BC546B, 2SA1315Y
Transistors, output stage: Sony 2SK60
Dimensions: W430 x L260 x H170 mm