Used 6L6GAY vacuum tube, which is a precious Sylvanian military tube produced in the 1950s for the output tube. Adopting highly reliable mycanol as the base, the elaborate and polite construction unique to vacuum tubes produced in advanced industrial countries in the age of vacuum tubes with impressive electrode support and getter structure is impressive. Compared to 6L6GC manufactured by GE, which is used in U BROS-660, it has a more solid sound. Commercialized as an integrated amplifier that has both preamplifier and power amplifier functions and allows you to easily enjoy the charm of vacuum tube amplifiers.
Many music enthusiasts set the following development goals for audio equipment. (1) It must be in the form of an amplifier that music fans can use easily. (2) Don't make a stimulating sound that doesn't make you tired of listening for long periods of time, not the so-called monitor sound that audiophiles demand. High stability and reliability that allows you to forget about machines and immerse yourself in music.
The integrated amplifier uses the first independent L and R channel choke transformers. Adopt L / R channel independent power circuit for screen grid. Combined with a thorough shield structure, improved crosstalk between channels over a wide band.P-G feedback type preamplifier with 1 stage amplification is provided. This simple amplifier has excellent characteristics and sound quality, and is an excellent circuit that has been used in the U · BROS series preamplifiers at Uesugi Laboratories.
The low noise vacuum tube ECC83 manufactured in the era of vacuum tube prosperity is used as a preamplifier and ECC82 is used as a driver to ensure high reliability. The four output tubes are independently self-biased and designed to suppress screen grid voltage. Therefore, a wide range of 6L6 family vacuum tubes can be used without adjustment. In the old model UTY-15, it was a push-pull output stage with a triode connection of 6L6GC vacuum tube made by GE.
The screen grid voltage is set to a lower value to the beam tube connection, which is the original usage of this vacuum tube. Equipped with a tape monitor switch circuit, the recorder can of course be connected to an external sound quality adjustment device tone amplifier, graphic, etc. Speaker output terminal supports 4,8,16 and can match impedance of wide speaker. Pursue universal values through succession of track record, reliable design and production methods.A non-resonant, non-vibrating, non-interfering structure that is not disturbed by others is inherited by a high-rigidity chassis made of 1.6mm thick galvanized steel sheet. We do not perform wiring by printed circuit board in signal amplification circuit, but take over hand wiring which can be said to be art by skilled craftsman with career for more than 40 years.
Output tube: 6L6GC (manufactured by GE). Voltage amplifier: ECC83 (manufactured by Telefunken).Rectifier tube: 5U4GB (manufactured by EH). Output terminal: Source output: 1 system, Speaker: 1 system (4,8,16). Rated output: 14W + 14W (THD5%). Input / output terminal shape: Unbalanced input / RCA terminal, speaker terminal / banana terminal. Residual noise (A-NET): 0.2 mV (master volume minimum), 0.45 mV (master volume maximum). Frequency characteristics: 10 to 40 kHz (+0, -3 dB). Power consumption: 130W (AC100V 50 / 60Hz). Maximum external dimensions (mm): 320 (width) x 199 (height) x 345 (depth). We are located in Japan.
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