If you have your setup going and lift the needle off the record, you may notice some tube rush and hiss that would be quite a bit higher without step-up transformers.
The position of your volume control tells us absolutely nothing about how much power your system is delivering. Your amp has 27dB of gain, which is a lot, but even assessing the impact of too much gain would require knowing how sensitive your speakers are, how loudly you listen, how large your room is, and to some degree what you like to listen to.
