Most clip-on electronic tuners (as well as some small handheld models) are powered by a CR2032 coin cell lithium watch battery. If you buy a replacement battery at a local department or electronics store it'll typically cost $4 to $5, but CR2032 lithium batteries can now be purchased from AMT for only 50 cents each plus shipping.
Popular clip-on tuners that use a CR2032 battery include the Peterson StroboClip, Korg AW-2, Fishman FT-1, Intellitouch PT10, Intelli IMT500, F-Zone FT800 and all Tune Tech models.
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AMT is now offering premium OGS [Old Growth Submerged] maple reso bridge inserts made from select quartersawn maple which is centuries old and has spent many years submerged under the cold waters of Lake Superior -- where natural aging combined with the action of anaerobic bacteria present in the lake have substantially altered its physical and sonic properties.
This wood's fine annular growth ring density [typically 20 - 30 lines per inch] far exceeds that of most modern maple, and indicates the tree it came from experienced very slow growth... resulting in smaller and more uniform cell size for increased stability/strength/rigidity/resonance. IMO this unique maple produces exceptional sounding reso bridge inserts.
The Mi-Si rechargeable battery-free preamps sold by AMT include an AC charging adapter, which can be plugged into an AC outlet and connected to the preamp's output jack for 60 seconds to fully recharge its on-board SuperCap power supply -- providing up to 16 hours of playing time before needing to recharge.
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Now available only from AMT is a rechargeable batteryfree Mi-Si preamp that's been specially modified to obtain improved sound from Fishman's passive Nashville bridge insert reso pickup. This unique charge amplifier preamp design substantially reduces the pickup's non-linear distortion and provides an active, buffered output which minimizes effects of cable capacitance while also providing better signal level matching between the pickup and Aura pedal.