VT-100 MKII sonics but need more power

It sort of gets hard to build a stereo tube amp at around 200 wpc because it just gets too large. You need a large, heavy power supply and output tgransformers, so at above 100 wpc you will start seeing more monoblock designs.

It's been a while since I verified the power rating of the VT-100, so I trust that it is 100 wpc (as the name suggests). If that's correct, then you need to amend your thinking about moving from 100 wpc to 150 wpc, because that is only a 1.5 dB increase in power. Generally speaking, you need to double the amount of amplifier power (a 3 dB increase) to be able to hear any real difference in sound pressure level. Hence, you'll need to go from 100 wpc to at least 200 wpc, particularly if your speakers are of average efficiency (in the 86-88 db range). If you have very inefficient speakers (around 83-84 db, or lower), you may even need a 6dB increase (or 4 times more power than the original amp).

As noted above, when you start moving into high-power tube amps, you are also moving into high-cost territory, and usually monoblock designs. If you really like the sound of your VT-100 amp, it might make more sense to look for different speakers with high efficiency -- say, 90 dB or higher. Just remember that for every 3dB increase in speaker efficiency, you can reduce by half the amplifier power needed for a given sound pressure level. If you get speakers that are 6dB more efficient than your current pair, you will only need one-fourth the amplifier power to drive them to comparable volume levels.

Get moving, Mono's are the way to go...VTL-MB 450 Signatures are your answer. You will get some change from a $5. They Rock !

Thanks everyone, it is not the that I want louder versus I want to make sure that the amp can control the large woofer 10" so maybe I just want to make sure that I have enough current? Also, what about the new CJ 140 power amp, 140 wpc stereo amp, is it any good? I am hearing it is one of the best CJ amps that the compnay ever made, I know probably a different sound then the VT-100.

Thanks again.

The ARC VT200 MKI would fit the bill, with power and musicality in spades (it is a great amp). Incidentally, I own the VT100MKII, and I find it to be quite powerful. I am using the VT100 MKII to drive MG 3.5s. The sound is beautiful and robust.