Instruction: Evaluate the answerability of a question by analyzing the related document, outputting yes if the document contains information addressing the question, and no otherwise.

Input:
Question: what is the difference between a 250a and a 250ex Everlast doesn't show either on their website
Document: We mainly keep 6011s since some of the welders are AC, but the Everlast Power Pro 256S welder handles them well( I'm using the 6011s on DC). My second rod, the 7018s handled well also, but the DIG function is not at variable as the one on the Trailblazer for either rod.
I just purchased one new and upon start-up the amp display would show something crazy like 1501. This was late Friday but I took a chance and sent an email, thinking maybe I'd hear back from them on Monday if I was lucky. They responded about 10 minutes later that something may be wrong and to give them a call before attempting to use the welder.
With use, this function becomes smoother. I got tired of fighting the thing and now have learned to vary the amperage using Up Slope and Down Slope with 2T and 4T functions. I hear you can get a plug adaptor enabling use of the Miller Amptrol Pedal with the Everlast Welder. Right now, too many projects to mess with this.
The UPS guy brought it in on a dolly and carefully took it to the downstairs of my office. ('Just thought they ought to be recognized for what they do right! )Everlast is rapidly grooming their units to the highest levels, so one must be patient for all the paperwork to catch up, etc.. They will definitely answer your questions in their forum or direct help functions. These are wonderful machines if you are able to be patient and understanding if a hitch arises.
I initially wanted a 250 EX with the analog dials, but Amazon Warehouse sent a 300 Stick instead... So there are 3 entities: Amazon, Amazon Warehouse, and Everlast from which to choose. I'm thinking if you want the latest, newest unit, ordering direct from Everlast might be the best, BUT if you go to the Everlast Forum, you can get detailed info on all the models.
Using a water cooled torch without water will pretty quickly ruin your lead and maybe worse.For anyone looking for more quick connect water/air connections Everlast uses, a search for "Fitting Male Abicor Binzel Style" 6mm hose barb hose connections led me to a couple places online. I purchased a handful of extras for additional torches I want to connect up.
i already had other cables and did order a 25 foot #20 water cooled torch from Everlast which easily just snapped into the sockets.The 255 EXT also has "Memorizable" Pre Sets,  Lift Start, Triangular Wave, Spot Weld, and a higher duty cycle, esp at the max amperage, 250. However, I've used this 256 S for over 50 hours now and have never bumped the duty cycle at 200 amps and lower.
The newer 255EXT Everlast has a couple of "automatic" settings which allow a broad range of use without getting into technical settings, but you can get technical if you wish.On TIG, the torch that came with the unit is huge, but I was surprised to learn to like the 2T/4T switch function, since I'd been addicted to the Miller Amptrol Pedal on the Trailblazer. I was disappointed to learn that the Everlast Control Pedal does NOT function with stick function.
I already have a 37 amp Chicago Electric, and a 50 amp Hobart Plasma cutter, but wanted to make cleaner cuts in 5/8 to 1 inch steel plates for the farm and shop. That's why I changed to the multi function 256S over the straight welder.Right now, Jan 2014, if you don't need a Plasma Cutter,  the Everlast 255 EXT is THE unit to get...  it comes with 2, 25 ft torches, one air-cooled and one water-cooled.
The 2T/4T finger lever does not change torch position much, and, if you've set a slow Up Slope and Down Slope, you can pretty well work around a tubing hole by pressing and releasing that lever switch and creating a series of increasing and decreasing amp levels.
Answer: yes