This is a page of short descriptions of the amps I have owned, or still own.
As a guitar player, to me there is nothing better than the sound of a good tube amp. Tubes have a special sound that you can't achieve with solid state components. Most of the greatest recorded guitar sounds ever were through tube amps. I'd rather play guitar through an old component removed from a TV or radio from the 50's than through any modern solid state amplifier. Back in the late 70's when I started playing, I had a solid state amp (because it was cheap) but I found an old Heathkit tube preamplifier with several 12AX7s in it to warm up the sound. I still remember being able to ride my bike up to Radio Shack and use their tube tester to test tubes. Those days are long gone.
With a good tube amp, you can set the amp for a good crunchy tone when pushed hard, then just back off the volume control on the guitar to play clean tones. For blues players who don't have the amp overdriven as much as rock players, the overdriven sound is much more subtle. Every tube amp I've played has a "sweet spot" where it sounds best. Some amps have a great sound in several places. An old Marshall head was always best with everything on 10. For smaller venues when you can't reach the sweet spot, a pedal can boost the signal going into the amp to give it a slightly overdriven sound even though the volume is low. It's not quite the same as cranking the amp, though, but sometimes you don't have a choice.
Different output tubes (aka amplifier tubes, power amp tubes) have different tonal characteristics. The 6V6 tubes were used in Fender amps in the 60's and have a clean tone until pushed hard, then have a nice breakup. Depending on the amp and the circuit used, they can sound "mushy" when pushed too hard, like in an old Princeton, but I've recently heard a Swart Spacetone that sounds pretty darned good even when pushed to 10. One 6V6 puts out roughly 5 watts or so, and some amps have two in a push-pull circuit putting out about 14 watts. Fender Deluxe "blackface" had 2, and is one of the Holy Grail amps for guitar players.
A 6L6 is like a big brother to the 6V6, and puts out about double the output. Some amps that use the 6L6 are the old Fender Bassman, and newer EVH amps.
EL84 tubes have a more glassy sound (some say it sounds like an ice pick) but produces a more definite mid-range "crunch" when pushed hard. It puts out about 6-7 watts, but a push-pull pair can put out 14-20 watts or more, depending on the circuit. The Fender Blues Junior uses EL84 tubes.
EL34 tubes are the EL84's bigger brother, and used in Marshall amps and clones. They have that great rock "crunch" when pushed hard, and glassy clean tones when the volume is backed off.
One tube you don't see very often is a 6973, used in some old Supro and Gretsch amps. I think this tube might have the best sound of all, but I don't own one of these amps. Yet. It sounds somewhat like a cross between the 6V6 and EL34, getting a pretty nice clean sound, but a moderate overdrive when cranked to 10, not as crunchy as an EL34, but not as mushy as a 6V6.
Sonny Jr. Super Sonny
This is custom-built amp by Sonny Jr. (Gary Onofrio) built for harmonica. It's the ultimate harp amp, but is also a very nice guitar amp. It sounds great as is or with pedals in front of it to get more crunch. It's essentially a reworking of a late-50's Fender Bassman with 2 6L6 power tubes, but optimised through Gary's years of experience building amps for harp. Puts out about 40 watts. Got it for the low price of $1200 when he was selling out back in 2010.
Update: Sold in 2015 for $1800, wasn't using it much
Bugera V22
This is the best small off-the-rack amp I've heard. It sounds great clean for blues and the overdrive channel sounds great for hard rock. I picked it up for the ridiculous low price of about $120 as a second from Musician's Friend. It has 2 EL84 power tubes. The amp has problems with switching between the channels, and there is a fix for it but I've been lazy about getting it fixed since I mostly use the clean channel. Puts out around 20 watts, but has a "triode" setting for half power (using one half of each power tube.)
Sligo Surfman 2x10
I had this built when I was getting back into the music business back in 2009 for $1275. Great sounding amp, similarly based on a Fender Bassman. From the designer: "It's based on a late tweed Bassman front end and an early tweed Bassman/Twin back end. I managed to add reverb and a master in between without using any extra tubes. The verb sounds great and the master is virtually out of circuit when on 10." It was built by Steve "Sligo" Clark from DC, who builds great amps for a reasonable price. I was trying to get a lighter amp than a full 4x10, so I had him build it as a 2x10 instead. I put a couple of neodymium speakers in to replace the Webers for a cleaner tone with a little more bottom end. Output is about 40 watts with 2 6L6 power tubes.
VHT Special 6 Head
The VHT amps are a bargain and a great sounding amp. They are hand built (in China) and hand-wired old-school point-to-point, and feature an amazing circuit that allows you to tube swap from 6V6 to 6L6 to EL34 to EL84 without any modifications. I've found the stock 6V6 tube to break up too soon and get muddy, kind of like the Fender Princeton, but the EL84 has a much cleaner response and breaks up with a more saturated Marshall-style distortion at low volumes. The EL34 sounds great too, but is a little louder, too loud for my typical gig these days. This has become my main gigging amp, as it sounds good at a relatively low volume, putting out about 5 or 6 watts at full power, and I use it at half-power in triode mode. :-)
Crate GT-80
This was my main amp in the late 90's in Sinister Grin, aka the "Chair Amp". It puts out 80 watts and sounds great, especially after a tube replacement, but has recently blown up. Fixing it might cost more than it's worth, but I'll investigate a fix. I picked up a second one on eBay for under $100, but it came damaged.
Custom Bogen clone PA head
This uses 2 6V6 power tubes and sounds amazing for guitar or harp, but has a huge low end, almost overpowering. I keep it mostly as a backup at gigs because it's easy to carry, but would not hesitate to use it if I didn't have other amps to choose from.
Crate V100h
Picked this up in 2014 to use on rock gigs. The Super Sonny was working out well, but not exactly the sound I'm looking for. The Crate nails it with the EL34 tubes. Using it with a Seismic 2x12 speaker cabinet 
loaded with some old Crate speakers I had laying around from my other busted Crate amps. All in all, a low-budget rock amp, paid $220 for the head, $112 for the cab, sounds to my ears like a vintage Marshall, although not nearly as durable.
Update: Amp no longer working. Was a dud, and by all accounts on the Internet, not worth getting fixed. I got the Bugera 6262 to replace it.
Marshall JMP 800
I played this in the late 80's and 90's, until I got tired of carrying it around. It's a Marshall JMP 800 and was sold a few years ago when I was slimming down, and it no longer worked. Great amp, I wish I still had it, but it was not in working condition and had too many modifications to it to make it worthwhile to fix.
Bugera 6262
Just acquired on eBay for about $200 shipped. Sounds remarkably like an old Marshall after I changed the tubes to EL34s, great amp for rock/metal. Sheered off the fuse transporting to a gig, but will get it fixed. Great amp.
Bugera 6260 Head
Acquired through a closeout on Musicians Friend for about $300 shipped. Amazing crunch with the original 6L6 tubes. I was going to change them to EL34s, but it sounds so good as is.
