Agree with @roberjerman on all points. Your noise floor may be too high and your choice of music is not reference quality. Also agree to try using a well recorded symphony to help tweak your system. A revealing setup will present layers of instruments with detail and separation between.
It may not be the fault of your amp, but you need to use low-noise tested tubes. Face the fact that it will cost you more than $40 each. Out of your list the Raytheon may be the most revealing, but testing for noise and microphonics is a must.
Telefunken or Siemens are really the way to go for transparency and low noise. Andy at Vintage Tube Services sells very low noise tubes, but only takes phone calls for orders. You tell him what you're looking for and your budget.
The noise floor is also affected by dirty power in your AC line. With the volume up and no music playing can you hear any noise or low-level hum thru your speakers?