• 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.

What's the issue in this 300B amp LTspice simulation

I posted a thread about how to simulate the output transformer, and how the circuit is working. But during the simulation, the output occurs clip at the negative half wave, I'm not sure why it happens.

I drew this diagram based on luxman mq300 manual and it's internal photo, the intention is to learn how this circuit works. Most of the values I think they are correct but some of them based on my limited knowledge.(R1, C6, R7, and all plate voltages).
 

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  • test300b.zip
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