(1) Apply the most appropriate voltage negative feedback drum current negative feedback;
(2) Selecting amplifying components with high FT, small NF and good linearity;
(3) Improve the consistency of the tubes in each unit circuit as much as possible;
(4) Adopt Class A amplification method and select excellent circuit program;
(5) Improve the power reserve of the power supply and improve the filtering performance of the power supply.
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