new Series IV version at NAMM
My main amp for all my gigging life was an X100B with EL34s into a Music Man 4x12. I loved that thing...had it for so long that I knew it inside and out. Sold it a year or two ago for $350 and I almost cried. I'd done the Torres mod to mine but I didn't like it quite as much after that. Preferred it stock.
Funny about that "moody" tone. I always thought that it would sound better during the gig than it did at soundcheck. It seemed pretty repeatable that it'd sound kinda harsh for the first playing session of the day, but if you turned it off for a while then turned it back on, it'd then sound markedly better. I got so I'd noodle around on it for a half hour before band practice and then shut it off. Then it'd sound great for practice. A very weird phenomenon and probably all in my head!
Cool. I have a 1980 X60B. It has some of the best clean tones ever! Clipping diodes (?) are used on the OD channel... not so good. For it's day, these amps had some cool features. XLR out, 1/2 power, adjustable slave out, active EQ, graphic EQ, cool footswitch w/ boost... I used mine for many years with a Tom Scholz power soak (amp dimed) and unbelievably, the amp still functions. Good, rock solid amp.
One of my letters to Carvin appeared in their catalog for a few years.