• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Any experience to drive 805 tube?

I have a 805 single-ended amplifier, and I plan to improve the performance by modifying the circuit.

Here is the circuit. I believed that the 1K resistor at the grid of the 805 was not very good. And others suggested that the 2A3 was not a perfect tube to drive the 805. Is there any circuit which is better than it? Thank you!
 

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    合并805线路图.JPG
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