That depends on what you call "all of your problems." From a standpoint of audibility, it's just a matter of choosing something with adequate power and operating area for your speakers, room, and desired volume. For non-auditory purposes (looks, feel, features, brand loyalty), you're on your own.
In my case, the JC 5 worked very well. But I don't really feel the need for something that physically large with a concomitant price tag. I just want similar power capability, and the amps I'm using at the moment exceed that, are 10% of the price and size, have lower distortion (which, to be fair isn't audible), and run cooler and more efficiently. But for sure, they don't look as impressive and aren't branded with Curl's name. That stuff isn't important to me, but if it is to you, then be happy with what you have.
As others have noted, the "advances" in power amplifier are in size, efficiency, and cost, not actual sound, but we're pretty close to the limit there as well. John's niche is recycling his 1978 designs into different form factors and branding, but that's commercial work, not actually technology.
