
The Leo
“With the Leo, the 300B for the first time opens up another world of speakers without losing the sound characteristics of the cult triode. The fascinatingly good-sounding integrated amplifier also impresses with state-of-the-art equipment and gentle tube management. We have never heard a better and – not surprisingly – more powerful single-ended 300B amp. In addition, the Leo offers all the features of a contemporary integrated amplifier and is also pretty as a picture. Big compliments!”
_Roland Kraft, stereoplay 11/2018
“LEO is a musical experience that flows forth in an unending 4-dimensional richness, completely devoid of artificialities and exaggerations, only pure musical content. With a good recording, the musical content (not the sound pressure) is even felt as a touch on the skin. Pure magic !”
_Nils Rigeblad, Professional Musician (Cellist) and owner of Studiokoncept.se
But at the heart of it are, of course, the two 300B power tubes that run in single-ended Class A operation in the LEO. Unusual is not only that the two 300B are installed horizontally (and so the usual old-fashioned tube amplifier look can be avoided), but a revolutionary circuit that comes instead of the usual 7-8 watts of a 300B smoothly to more than double and that with at least the same life! Because we know: Outputs of 7-8 watts are usually not enough to enjoy music without fear of clipping. But with 20 tube watts many loudspeakers can be operated perfectly. In short: The LEO is our interpretation of the modern 300B tube amplifier.
Technical Specifications
Output power 4 Ohm (THD): 5% 20 W
Output power 8 Ohm (THD): 5% 11 W
Frequency response 5V in 4 Ohm (-3 dB): <20 Hz–>35 kHz
Input impedance Cinch: 10 kOhm
Input impedance XLR: 20 kOhm (symmetrical)
Input impedance Phono MM: 47 kOhm // 100 pF
Input impedance Phono MC: 1 kOhm
Sensitivity Cinch: 30–300 mV (adjustable)
Sensitivity XLR: 30–300 mV (adjustable)
Sensitivity Phono MM: 300 μV–3 mV (adjustable)
Sensitivity Phono MC: 30 μV–300 μV (adjustable)
Signal-to-noise ratio high level (10 W/4 Ohm): 98 dB(A)
Signal-to-noise ratio Phono MM (10 W/4 Ohm): 84 dB(A)
Signal-to-noise ratio Phono MC (10 W/4 Ohm): 74 dB(A)
Bluetooth input
Bluetooth Standard: V4.2
Codecs: BC, MP3, AAC, Faststream, APTX
Samplerate (adaptive): bis 96 kHz/16 Bit
Frequency response: 20 Hz–20 kHz
Signal-to-noise ratio: 96 dB
Tubes: 2 × ECC81, 2 × 300B (matched)
Operating voltage: 230 V (internally switchable to 115 V)
Power consumption operation: 160 W, Standby < 0,5 W
Dimensions (W × H × D): 430 × 430 × 135 mm (depth including the speaker terminals)
Weight: 14 kg (chrome & gold finish weights more)
