The Pathos Logos MkII is a hybrid integrated stereo amplifier. It uses a tube preamp stage and a MOSFET output stage. This MkII version adds power supply upgrades and a redesigned tube preamp section over the original Logos, which Pathos introduced in 2002.
The amplifier is built by hand in Italy at the Pathos factory in Vicenza, including the PCBs, chassis, capacitors and heatsinks. The heatsinks spell out the Pathos name. The case comes in matte metallic black or padouk wood, which is cut, sanded and finished by hand in-house.
Inside, a dual-mono power transformer is potted and encapsulated to reduce vibrational and electromagnetic noise. There are three separate stages of regulation: one for each channel of the power amp and one for the tube preamp. Each channel has 44,000 uF of custom-made Italian capacitors. The tube section runs in a fully balanced configuration, and the volume control is resistive.
- Type
- Integrated stereo amplifier, hybrid technology
- Preamp stage
- Tube, 2 x 6922 ECC88, class A
- Output stage
- MOSFET, class AB
- Output power
- 2 x 110 W RMS @ 8 Ω (both channels driven); 220 W @ 4 Ω
- Frequency response
- 5 Hz - 140 kHz ± 0.5 dB
- Max input voltage
- 6 V RMS
- Input sensitivity
- 500 mV RMS (39 dB gain)
- Input impedance
- 32 kΩ unbalanced, 20 kΩ balanced
- Output polarity
- Non-inverting, balanced pin 2 +
- Volume control
- Burr Brown PGA2310, 100 steps
- Damping factor
- 360 @ 8 Ω