Introduced several years after the Automega E-5, the Omega E-6 Enlarger was essentially a 5x7 version of the D-2XL.  Like the E-5, the E-6 could be purchased with Omegalite cold light head, or condenser lamphouse.  Since it was not limited by the autofocus mechanism, the E-6 had an extended XL length column. 

Later, when the Chromega colorheads were introduced, initially only the 4x5 Chromega D lamphouse was available to be fit the E-6 chassis. It was not until 1968 that the first Omega 5x7 colorhead, the Super Chromega E, was introduced.  When the Super Chromega E Dichroic lamphouse arrived, the E-5 and E-6 enlargers were replaced by a an updated chassis with revised negative carrier system, and the Omegalite and condenser lamphouses were discontinued.

Used Advice: Some parts, such as most lens mounts and lens discs remained in production until recently, but other parts, such as negative carriers and autofocus tracks, may be difficult to find.