The 22H shares the same basic two channels as the bigger brothers JCA50 and JCA100 - both of which are (in a sense) non-handwired Chinese made Soldano Hot Rod+ amps. Even Mike Soldano himself has said pretty much the same. Those are basically a derivative of the Soldano SLO. The 22H has EL84 power section vs 6L6 that the bigger brothers have.
If you feel it lacks low end, you can add a Depth control. It is a very easy and inexpensive 'mod' to do, and I think it should come stock to be honest. At lower volumes it really opens up and loosens the low end and allows it to bring in much needed bass response.
You can also do the "SLO mod", which is basically converting the values of some resistors and capacitors to SLO specifications. Not a difficult mod, but you must have electrical knowledge and soldering experience if you want to do it on your own (you are working with LETHAL voltages). It'll cost about $20 in parts and maybe an hour or two of your time, or have a shop do it for around $250.
My experience with the "SLO mod" on my JCA100H makes it sound a little more open/uncompressed, gives it a little more hair, and makes the gain knob much more usable in the entire sweep, but doesn't make it any gainier.
I think that in the end I prefer how it sounds stock (non SLO mod) with the Depth control added. They are great sounding amps and are inexpensive enough without worrying about how long they'll last. They're built solid despite being 'made in China' which a lot of people blindly hate.
The 22H is great because you still get the same *basic* character of the other Jet City (and Soldano) amps, but can push it harder, and sound better at lower volumes.
