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Just a word of caution : If your SL is still under warranty, by exceeding the manufactures voltage, will void it for any future repairs !Jim in Idaho said:If you install a 16.8v battery pack, there's very little difference. Pulse detectors are current-driven, so upping the voltage directly improves the performance. The TDI's came with 16.8v packs. The SL came with a 12v pack, but will run with a 16v pack. A guy that goes by "reidman" sells the 16v packs for the SL's. I don't see tham listed on @#$%& anymore, however.
Jim
According to Howard at Whites, they changed the sweep speed caps on all SL's made after 2015. But, the Special Edition that a friend in Florida bought had the same .47ufd caps as the original TDI SL. So, no change in sweep speed. That wouldn't make much difference on the beach, however, but would impact gold prospectors. The second mod that Reg Sniff recommended...the removal of diodes D20 and D21, and a jumper across two of D21's three connections, and the removal of C56, was done on his Special Edition, however.karelian said:While I moved to the Tdi Pro from a SL, after a year I missed that smooth SL threshold and super light weight and beautiful balance. The new handle and pretty desert tan paint work saw a Special Edition SL back in my arsenal of machines. I now still have my Tdi Pro, but also enjoy the new SL, mostly as an urban/beach machine and as a loaner when out prospecting with family and friends. Using both machines I must say I enjoy both. Image shows the Special Edition with Miner John made 14 x 8 mono coil, aka Jimmy Sierra Digger coil. Used on the beach it is a easy to swing rig, light and nicely balanced. Yes is does appear to be less swing speed sensitive than the earlier SL models. That works well with larger coils for beach work. My love affair with the High, All and Low conductivity switch means the water proof version will not be considered. We are spoiled for choice.
All the best,
Karelian