I have a 36W TMB + ef86 with a half power switch. I love it.. very marshally on the TMB channel and jangly/voxy on the ef86.. but it´s not the kind of amp I would go if I want cleans. It breakups a bit early and it´s "magic" comes alive with a bit of volume and grind.... great great amp for classic 60s/70s rock, "british invasion" sounds and "hard" blues...

Don´t know about Ceriatone cabs for the 18 or 36 watters, but I think it would be around the same size of a JTM45 headbox.

As for the Kleinulator, there´s lots of info about it @ the Overtone forum.

A few things for people who may be lurking to figure out what they want (I actually already highlight this for gasp100 over on the gear page a while back).  The TMB 18-watt isn't a historic amp design, it's a very recent modern derivative from the boys over at 18watt.com.  The original tremolo-equipped 18-watter is very much a Watkins clone, it offers a lot of great chime-y clean and grinds well, but is very different than the bigger Marshalls.  IMHO, it's an incredibly responsive, amp that offers a lot of great clarity and definition within a nice middy clean tone, and then some nice hotter tones; perhaps one of the best lo-gain "one trick" amps out there, easily on par with a Tweed Deluxe or Matchless Lightning.  Personally, I think the original is the best, the derivatives are all trying to make the amp somethingit is not (the amp is not a low-output Plexi) and make compromises in return. 

The TMB, on the other hand, takes a Plexi-style tone stack and drops in in place of the tremolo channel (but keeps the regular channel).   You forfeit the better clean channel for a much more rock-oriented, more Marshall-oriented channel.  The TMB tone stack really gives it that JTM-45 feel (it lacks the fast attack of a Plexi) at a smaller output level (power tubes have a much less significant role in voicing an amp compared to the tone stack). 


The JTM-45 is considered to have a lower gain preamp with a bluesy, sag on the attack of the note due to it's tube rectifier (the original offset JTM-45 sounds nearly identical to a '59 Bassman, the later JTM's we usually see cloned are more aggressive)  "best clean tones of a Marshall" is purely subjective.  I'll take the faster, jazzier clean tones available on a Plexi (preferably '67) over a JTM-45 anyday, and that fact that the JTM is really only 35-watts or so RMS means that I can get noticeably more clean headroom out of a 50- or 100-watt Plexi over a JTM-45.

What it comes down to for me is this - Can I get enough clean headroom with the 36W EF86? 

I think the tones described for this one must be very close to what I'm shooting for, but I'm concerned I wont be able to keep up with my drummer without getting into quite a bit of saturation.  I can definitely get the headroom I need with my JCM800.  I also have a (2xEL84 15 watt) Fender Pro Jr. which saturates a bit too early but not much - just to give you an idea.