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https://stereo-magazine.com/article/cayin-introduces-new-tube-amplifier-cs-805a

Besides the two 805A output tubes, Cayin’s new CS-805A also features WE6SN7 tubes in the voltage amplification stage and 300B tubes in the driver stage for the output tubes. With an integrated bias indicator, bias adjustment for the 805A tubes is said to be straightforward; in addition, the 300B tubes can be levelled via a hum balance control. The negative feedback can also be switched between 0 and -3db via the included remote control.

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