Opera Linear 845 25th Anniversary Edition Tube Merger Amplifier Hifi Sound System

The Linear845 combined tube amplifier, as a commemorative version celebrating the 25th anniversary of

the establishment of Oubo Audio Company, fully embodies Oubo’s accumulation in the research and manufacturing of tube machines,

and is currently

the flagship product in the combined machine market.

By using Class A single ended circuits with beautiful sound in electronic tube amplifiers and specially designed high swing driver stages,

the “gall” of the 845 power tube’s “roar of dragons and tigers” is fully utilized.

Especially the input interface has two sets of truly balanced inputs, which are converted into the amplification part through

the famous Swedish LUNDAHL input transformer to meet the needs of most audio sources today. The power tube uses fixed bias technology, and

the screen current can be manually adjusted through an intuitive meter head to ensure that the electronic tube works in good condition. Users can also change

the negative gate voltage of the final power transistor and replace it with a 211 power transistor through the built-in switch.

The materials used in this machine are uncompromising, including a series of high-quality components such as RA resistors, EIZZ stepper potentiometers,

and Neutrick balanced input and output terminals, supplemented by silver wire cross-linking and shed welding methods inside the machine. Provides high-quality internal electrical

characteristics to ensure ultra-low loss of sound signals.

Combined with the excellent linear amplification capability of the electronic tube itself in the absence of negative feedback across the entire frequency range,

it greatly ensures the lossless, proportional amplification, and high-speed signal response capability of the sound source signal. Provides transparent and high

transient auditory performance.

Technical indicators:

Output power: 28W x 2 (RMS 1kHz)

Harmonic distortion:<1% (11watt, 1kHz)

Frequency response: (-3dB) 10Hz-27kHz

Sensitivity: 310mV

Input impedance: 100 k

Output impedance: 4 , 8

Signal to noise ratio: 90dB

Power consumption: 300W

Input terminals: 2 sets (RCA), 2 sets XLR

Electronic tubes: 1 x ECC83, 2 x 5687, 2 x 845

Size: 490 x 450 x 310mm (W x D x H)

Weight: 33kg