Hi, I have a year old 50 Overtone Special head (forest green color) and a Kleinulator for sale. It has brand new Mesa/Boogie 6L6GC tubes and the J Zucker mods installed by a prof tech.  Exc-Mint cond. $1400.00 for both shipped and paypalled!
I also have a T.C. Electronics M300 dual engine rack proccesor in a 2 space black carpeted rack $150.00 shipped and paypalled.  And a Sansamp Midi Mouse w/ a 15 ft midi cable $80.00 shipped and paypalled.
Pics  can viewed on  thegearpage.net under amps for sale. I`m also listed as jads57 on the gearpage as well as Ebay and have references available.
 Continental U.S. only please & Thanks for looking!

 These are great amps, but require some patience to find your sounds. I used to have a California 15 in an open back Avatar cab 1x12 modified. I ran it w/ a Boogie Mk2 simulclass head. I found it to compress at louder volumes, so Iended up w/ a JBL K130 instead.  I know that Eminence makes a JBL inspired speaker called the Commonwealth(very heavy like 12-14lbs)  I think you might be happiest w/ a real EV 12 though. Good luck!

 Thanks Bill for the info. I always seem to run my clean fairly loudly. And the only 50 watt amp that seems to have enough clean for me is my Heritage Colonial. So I`ll probably end up having it upgraded to 100 watts as soon as I can afford it.

the reason I eventually want to upgrade to 100 watts is for the clean headroom.  Right now if I need more clean headroom, I end up running a slave amp( Crate Powerblock) into another cab. It actually gets a great sound, but would like to not have do deal w/ all the extra cables.

Got the amp back rebiased properly,and the J Zucker mods. Definetly a lot better w/ the changes.  I probably am going to have it upgraded to a 100 watts when I get some more $

Congratulations on getting your amp! I too recently got one, fantastic amp, and am getting used to how work w/it. Beleive it or not, even though I`ve actually owned a Dumble amp( 1980 version OD Special) I`m having to learn how to adjust the settings all over again.   One thing I`m realizing about these amps unlike most others, is that they are very tone sensitive. They are not a flat response base to work with. I hope I`m making sense here.  I think even more than the guitar,they seem to shape the overall tone.  And given that, it takes a lot of adjusting (tweaking) to find the exact sound you`re after. It`s almost like setting up a guitar to play to your personal preferance.  Best of luck in your new tone adventures!

I ended up taking my OT Special 50 to a local tech to have the J Zucker Tweaked Mods installed and biased properly. Should have it back in a couple of weeks!

 I`m using 2 different Avatar 2x12 cabs one has a Eminence Swamp Thang & a Lil Texas wired at 4ohms. The other is  like the previous posters w/ Celestions V 30 & H 30 wired at 8ohms.  Both great cabs!

Thanks for the info about the different preamp tubes. I have JJ 12 AX7`s in all 3 slots. I noticed that the other Overtone I played through had been tubed w/ Groove Tube 6L6GC power tubes and GT preamp tubes( not sure which ones though). That amp had a tremendous amount of gain in the overdrive mode. I thought maybe someone just adjusted the internal trim pot at full. One other ? I have is, how should the phase inverter trim be set? Mine is  set at exactly half (12 o`clock). is that correct? What exactly does the trim pot effect anyway? Thanks again in advance.

  Thanks for the info. But  Ijust got back for trying another( newer) Overtone Special 50 and the amp stayed totally clean when either running the pre low 2-4 or 6-8 and the master low or full volume. I`m wondering if this amp has had the J. Zucker mods.

    I`ve never experienced that w/ other master volume circuits. Why does it act that way w/ this particular amp? Thanks again!

Thanks for all of the info everyone! I ended up putting a spare set of Mesa Boogie 6L6GC(STR-440`s) in the amp and biased to about 23mv.  I also took the advice of running the master lower and the pre at around 7. Sound way better!   The only thing I`m wondering is that on my master volume there isn`t much range. Once I get past 3-4 it doesn`t increase in volume a whole lot until around 9-10. Does anyone else have this same problem?

 Thanks evryone, I` found out the guy who owned it before me never had the pwer tubes biased properly.   

   Could you further elaborate on the master distorting at full volume please. I assumed it worked like a Fender type circuit( pre and master volume). Thanks again in advance!

Hi, I `m having trouble getting a good clean out of my OTS 50. Even when running the pre low(say 4 and below) and the master at full. I`ve checked out all of the preamp tubes. And I compared it to another OTS 50 at a local store here in St. Paul (Willies Guitars) That one sounded not only louder but extremely clean, even w/ the pre running at 6-7.  I`m running fairly vintage  output humbuckers and mini-hums into the normal channel. Any help would be greatly appreciated, thanks in advance!