• 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.

Audio Note M10 Clone

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Why would you expect the same result?! Please compare the two circuits you posted above, do you not see the differences in the grid voltages? Another case of garbage in garbage out...

what fool I am, I thought the DC of grid will not affect the tube:boggled:
after add a 130V DC to the grid, it is same as the real circuit. Thank you very much:D
17.JPG
 
Now put all to the circuit, It works.
View attachment 641753

Output wave is not good
View attachment 641754

Output wave clearly shows clipping.
Did you simulate the voltage gain of this stage? It will be more than 50. :eek:
Do you expect this to be a normal line stage? :confused:
In the complete M10 preamp it is attached to a low gain phono stage (gain approx. 40, delivering some 200 mV into your line stage with a standard 5 mV input); that's why you need the "excessive" gain of your stage.
But this has been mentioned before, remember? :rolleyes:
5687 operating point is poorly chosen; try 7k5 of cathode resistance.
 
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