Can you use also kt88 tubes? How do you change the bias?

Dear sir, EL34 have the best sound for this MUZISHARE - X5. If you love the KT88, you can get the MUZISHARE X7. https://www.amazon.com/gp/product/B07K6H123S

is the power amp section on this fixed bias or cathode biased?

Hello, Adjustable bias, and it's easy to adjust the bias by outside. And has its own adjustable meter.

it appears from the back there is no phono preamp?

Hi, X5 has no phono preamp, and the X7 can be use as a phono preamp. Please refer to below link: https://www.amazon.com/dp/B07MMMM6VX?ref=myi_title_dp

X5 Integrated Amplifier EL34 x4 Push-Pull Vacuum Tube AMP with Remote

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