From what I remember the RCA cleartops were very good. I got a pair of "butt ugly" from the Brent Jeese fairly cheap. There were some that were a little harsher than others but the RCAs weren't. It's been a long time though so my memory is a little fuzzy on specifics. Also the tubes go in the front. They are about as tall as the back power tubes so don't want anyone getting confused.