Re: Anyone here own or used a Hughes and kettner 20th edition tube amp?
I have that amp.
As far as volume for gigs goes, the clean channel definitely struggles a bit if you are playing un-miked. You have to turn it pretty high and by that point it is definitely breaking up a bit. The lead channel is fine and plenty loud, even un-miked.
As far as sound goes, i adore the clean channel. It sounds good at bedroom volumes, and sounds like absolute bliss if you can get it up to at least 3.. I compared it to a hot rod deluxe, and genuinely prefer the H&K. With the volume on around 7 you get a lovely breaking up sound, and with it on 10 a great classic rock sound thats not fuzzy but is very rich and dynamic. The reverb, though subtle, works well with it as well.
The lead channel is good for high gain stuff - lots of sustain and saturation, and a great heavy rock/metal sound.
The only disappointing thing about the amp is that it is not possible to get a good low gain/classic rock type sound at low (bedroom) volume. The lead channel is just too saturated and a touch fizzy (IMO), even with the gain on 2. If that amp had a lead channel with more range in gain level, it would be an incredible amp, and would be streets ahead of amps like the marshall dsl40 and peavey classic 30. As it is, i prefer the gain channels on the peavey and marshall because they have better low gain and crunch sounds, but the clean on the H&K is definitely superior.
To answer your other questions, i dont know of any reliability issues. It is not amazingly well built and a bit of a pain as far as tube changing goes as you literally have to open the back and remove the chassis to change them - not good if you blow a tube at a gig.
Whether it is all tube i dont know. I would imagine the power amp section is all tube (two EL84s), but there are only two 12ax7s in it, which is quite uncommon, and it may be the case that the pre-amp section is only part tube, though I dont understand the ins and outs of amp circuits and nor do i want to - if it sounds good thats all that counts.