KT88 tube amp

I've used ps vane jj tung sol and sovtek, none of which were in a quick silver. Ps vane was the worst performing. Jjs and tung sols were the best.

I use Golden Gate. The quality of bass depends to size of output transformer, quality of power, interstage and cathode shunt caps, dumping factors, and the last - quality of speakers.

Forget the KT88's and go with Electro Harmonix KT90  these are great tubes with plenty of bass at the bottom and have a very strong midrange punch, also they do not grate on your nerves at the top end.I took out my EL34 tubes that came in my PrimaLuna Dialogue Premium HP Integrated and everything just opened up, it now sounds like I wish it did when it came from PrimaLuna.

Alucard, how many hours did you have on your factory PL EL34s? I have the new EVO 400 Integrated and love the sound... but there's always that lingering question about 'better, more, yes?' :)

To Rudolfogrease 
The PSVANE there are two versions, the mk2 is the recent production.

Thanks to all for the info.