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As people have said, it simply isn't possible with a standard 9V PP3 battery. It's just too small and not powerful enough. The power drain would be too high and PP3s are rated at about 500mAh so even if you could build something that'd do it, at 100% efficiency it'd be drained in a few minutes. More likely it'd just overheat and catch fire.
If, however, you are asking if you can use a 9VDC supply then that is entirely possible provided it has sufficient current, you just need a relatively high powered inverter. It's a bit hard to know what you mean as unfortunately '9V battery' has become synonymous with 'PP3/6LR61 battery' though I'm thinking you mean the former as there aren't many other types of 9V battery out there. It would be feasible to run it from a 12V SLA battery but don't expect it to last very long.
I won't bore you with the math. The simple facts are this. The energy required by even a 5W tube amp is far greater than what is available from a 9v battery. You could certainly build something that does what you want, but unfortunately it would only run for at most a few minutes before your battery was drained.
I think you're full of pride. Anything is possible.
Posted:May 18, 2013
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