It would be greatly underheated and heater current would be less than 100mA giving more than 2 hours operation with a standard 9V battery.
(Later addition, and of course 12SK7 too. The 6SK7 is used front end on RCA BA-6A. The 6SK7 vari μ electron tube elegantly performs the function of low noise amplification and automatic gain control on the favorite limiter of Dave Gilmour, Pink Floyd?)
It is vari μ which is a good thing for low plate voltage work.
The suppressor grid is not connected to cathode. So it can be triode connected.
How would it perform with pull up or Pleiades bias as a mic amplifier?
Later addition. The UF85 may be even more suitable as it has greater transconductance and a higher range of possible vari μ grip potentials before cutoff. Note there is difference is heaters.
How about UF11?
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