Welcome more4112, thank you for joining.
What speakers, cables, and source are you using?
If your stock tubes are the EL-34's, they are not bass monsters. They have a glorious mid-range and treble, but bass is a little soft and round. If you are experiencing tubes for the first time, coming from solid state, it's different for sure.
Please make sure you are wired correctly on the back of the amp, it's a little confusing.
ohhhhhhh , ok ............ my pre amp has no volume control so thats not a option
so , i just had a audio tech advise me against putting kt150's in my amp , says they draw to many volts and could hurt the amp .......... any input ?