To Fini > I am not in the witness protection program. I am alive and well in Massachusetts. In Massachusetts there are many of my family members with the (Italian) "Latino" surname ...
Both the VTA ST-70 and VTA ST-120 may be had with either the standard gain 12AT7 driver board or the lower gain 12AU7/12BH7 driver board. The determining factor is usually the efficiency of your speakers. The standard gain board works well with speakers of 93 dB or lower. Above 93 dB I recommend the lower gain version of the driver circuit. Since all Klipsch speakers are fairly high efficiency speakers, the lower gain version is probably the best choice with Klipsch speakers. Another approach to deal with extra gain, is to use either the VTA ST-70 or VTA ST-120 with the stepped attenuator option. Most audiophiles use the VTA stepped attenuator kit as a volume control with a single high level input (CD player, FM tuner, mp3 player etc.) but you can also use the attenuator as a "master gain control" WITH a preamp. If you set the attenuator at about 12 o'clock and then run a signal from your preamp into the VTA amp, it will require more preamp output for a given volume level from the amp.
Bob Latino