Ken-Rad VT231 has been known to deliver excellent bass and sweet mids. Sounds like you didn't get any of that! Well, at least, you will probably be able to easily sell them.
Tube Rolling - No Change in Sound
In my Wyetech Opal pre, I substituted NOS Ken Rad VT231's for JAN Philips WGTA's in the input stage, expecting more body and warmth to sound based on Ken Rad reputation. But nothing has happened; I perceive no audible difference from the switch in tubes! What's up with this? This was my first foray into tube rolling.
Neal
Neal