I have a 99 which has been by far, the biggest sonic improvemnt my stereo has seen ever.The 99 uses an all tube mu-follower circuit.It is a bigger and heavier pre than the 66.Both use nobel volumn pots.The 66 has a balance control,the 99 doesnt.The 99 has a headphone jack located on the back right of the unit.The 66 doesnt have a headphone jack.The 99 has a slow turn on to lengthen tube life.The 66 doesnt.Both come with a heavy,machined,aluminum remote but its an option with the 66.Both are avaliable with a phono board which I have.They both are avaliable with NOS tubes but I recommend getting the stock tubes then rolling with NOS.Kevin Deal of Upscale Audio is up on Rogue and knows what sounds the best in them.I have found BDR cones #4 to be mandatory with my 99.I havent heard the 66.Audio Musings has a review of the 66 where it was put against the A.I.mod.3A Overall the reviewer liked the 66 better.In other threads here the 99 is discussed.One owner of the S.F. line 2 has decided to get rid of the line 2 in favor of the 99.In my opinion either the 66 or the 99 will give complete satisfaction as an addition to an already excellent system.The only written review of the 99 I am aware of was in Listener mag. a while ago.I didnt read the review.I heard it was very good though.Mark O'Brien designer and prez of Rogue is very attentive to customers needs.
