jallbery above stated that LX6s only came in f/6.3. That is also a misunderstanding as they made both f/10 and f/6.3. I have had both. I also used to have a website named Telescope Bluebook where I listed the key elements, year of release, etc. of hundreds of telescopes.
I stand by my statement.
A true LX6 is only in F/6.3. Meade had so many problems with the initial F/6.3 scopes that they had to keep selling the F/10 LX5s. They then essentially renamed the LX6 as the Premeire line which they then offered in both focal ratios. There were a variety of models with various levels of accessories (the bigger the number, the nicer the accessories).
The above matches what Rod Mollise has documented in his SCT guide.