Focus Audio Listz Sonata Amp for sell

by adamong33 Wed Mar 11, 2020 9:02 pm

The Liszt Sonata is an integrated amplifier based on the EL34/6CA7. It’s a push-pull class- AB design with deep class-A bias to get the sonic benefits of class-A operation, producing 35-watts per channel. The driver circuit is a cathode coupled voltage gain and phase-splitter design. It’s simple and good sounding circuit topology was implemented in many highly successful tube amplifier designs through the 1940s, 50s, and 60s. Leung states that “our goal is not to reinvent but to leverage the fruits left by these brilliant designers.” The driver stage utilizes two 12AU7s and one 12AX7. All tubes are from Electro-Harmonix. Auto-biasing is employed to give best stable operation without the need for frequent bias adjustment. The power supply is the heart and soul of the amplifier and Kam Leung is very serious about his power supply design. Liszt Sonata’s power supply is well designed and has a massive power transformer. Its power transformer is essential for the delivery of unrestrained current supply to the amplifier. The power transformer weighs 17.5 lbs and it is designed to supply about 300% of the required current the amplifier needs. This extra current capability is responsible for the flat 20Hz response at the rated output. Leung says, “The transformer uses the top grade grain oriented silicon steel lamination to ensure cool stable operation.” Instead of using the traditional large value-capacitors design, Focus Audio’s approach is to use a fairly small value 30uf film capacitor from the German manufacturer, Mundorf. Leung explains that this small capacitor provides a wide charging window for the rectifier and the current waveform is very close to sinusoidal with no spike. It also uses high speed rectifiers with fast switching recovery times to minimize the rectifier switching noise. This, together with the 30uf Mundorf film input capacitor which has very low impedance at high frequencies, (about 0.0095 Ohm at 57 kHz) enables it to filter out most of the noise components from the AC line and the rectifier. This allows us to hear the low signal with less noise.

Selling price is 25, 000 negotiable
Condition =9 out of ten (pet free and smoke free in a independent audio room)

Pls whatapps or call me at 0123774417 Very Happy

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Pictures will be sent if you want to have a look. Have a nice day

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