I have 2000 JAN6418 and they are really susceptible to vibration. I use them in a Guitar Clean Boost pedal called Octane. In development I had to forgo the standard footswitch and instead use a microprocessor and relay to bypass as the standard footswitch caused the tube to make noise. I also had to float the tube with 1/2 inch of foam. Vibration would truly make this tube have noise.
Though it's directly heated nature and it's very low filament current probably make it good to work on batteries.

It's not good
An d there is no any response from the Shanling company if there is any problem.