Re: THD Hotplate?
As mentioned, when used at the -4db and -8db settings it's pretty good. At -12db it starts to alter your tone....largely because you're speakers aren't moving like they should.....but I point out that they'd be suffering the same problem if you simply turned your master volume down, only you wouldn't be getting a hot power tube tone.
One thing to note; it's not a miracle worker, and it wound give you stellar tone at bedroom levels....but you will sound better (IMO) than you would playing with your master volume at 1.
Another thing to note; The whole pupose of a Hotplate is that it removes headroom. It does this to all channels, including your clean. So, if you're nocking the equivilant of 50w worth of headroom off your amp, don't expect your clean channel to sound like it still has 100w of headroom. You'll need to turn it back up to match the volume of the lead channel, and you'll probably end up overdriving your cleans too.
Anyway, I love mine.....but those are some of the problems I've seen people complain about.