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3

Design Notes from the Builder 

 

Thank you for choosing the Sugarland amplifier.  This amplifier represents the culmination of 
nearly 30 years of research and development in amplifier design.  It is by far the finest work I’ve 
produced in all my years as an amplifier designer/builder.  The Sugarland was conceived as a 
craft made, masterbuilt product in which every aspect of production work is performed either 
myself or by an assistant under my direct supervision.  This includes all woodworking and 
upholstery operations, all electronic assembly operations, and also many custom fabrication 
operations as well.   By developing the Sugarland as a masterbuilt product (as opposed to a 
traditional production-line product), I had the freedom to consider impractical production 
methods and to select the finest components regardless of cost. The result is an 
uncompromising and unique amplifier that goes beyond traditional “boutique” amplifiers in 
terms of sound quality, build quality, artistry, and design innovation.   
 
 
The Sugarland’s finely tuned cabinet 
produces a tonal response with exceptional 
depth, clarity, dynamics, and balance.  The 
cabinet body and the baffle board are 
constructed from a combination of solid 
woods (not plywood) and are glued up as a 
unified resonating body so that the entire 
cabinet participates in the acoustical 
behavior of the cabinet.  This type of design 
delivers a deep, rich, dimensional sound with 
a uniquely natural and unconstricted tonal 
response – like an acoustic instrument.   

This cabinet design is quite different from 
traditional guitar speaker cabinets, which use a 
plywood baffle board attached to the cabinet with 
screws and wooden cleats.  By comparison, the 
Sugarland’s unified solid wood construction is 
significantly more difficult and time consuming to 
build, but the results are quite extraordinary – an 
example of impractical methods that help the 
Sugarland move beyond the performance of typical 
“boutique” amplifiers.     

 
 
 
 

Summary of Contents for Sugarland

Page 1: ...1 Sugarland 12W Guitar Amplifier User Manual Bartel Amplifiers LLC 4401 Eastern Avenue Bldg 46A 3G Baltimore MD 21224 www bartelamps com...

Page 2: ...Only use attachments accessories specified by the manufacturer 9 Unplug this apparatus during lightning storms or when unused for long periods of time 10 Refer all servicing to qualified service perso...

Page 3: ...e amplifier that goes beyond traditional boutique amplifiers in terms of sound quality build quality artistry and design innovation The Sugarland s finely tuned cabinet produces a tonal response with...

Page 4: ...ontrols with a new form of circuitry that provides a more complex tone control behavior than a conventional guitar preamp While conventional treble bass controls offer simple variations of a single vo...

Page 5: ...uires the fabrication of custom made components For example I custom mold a number of components including a set of wire trees to help implement a tidy secure wire layout and custom molded knobs with...

Page 6: ...5 Operation 12 Unpacking 12 Setting Up 12 Connecting Your Guitar or Pedalboard 12 Powering Up 12 Powering Down 12 6 Dialing in Your Sound 13 Preamp Controls 13 7 Getting a Great Sound at Home 14 The E...

Page 7: ...V6 Biasing Cathode Bias Operating Mode Class AB Output Impedance 8 Ohms Power Supply Type Tube Rectified Tubes 1x5Y3GT Cabinet Body Solid Eastern White Pine Finger Jointed Baffle Board Multi Piece Sol...

Page 8: ...the Treble control performs the function you expect i e increasing decreasing the amount of high frequency content in the signal it has a more complex and profound effect than a conventional Treble c...

Page 9: ...own as needed This will help maximize the signal to noise ratio and will generally provide the best tone Power and Standby Switches The Power switch is used to control the application of AC power to t...

Page 10: ...from that shown in the illustration above IMPORTANT The MAINS power applied must match the voltage and frequency specification printed on the back panel of your amplifier Fuse It is essential that th...

Page 11: ...ive only an external speaker and to disconnect the internal speaker then you must unplug the internal speaker from the main speaker jack location on the underside of the chassis and connect the extern...

Page 12: ...to turn the reverb and tremolo on and off It isn t necessary to connect the footwitch to use reverb and tremolo If you don t connect the footswitch reverb and tremolo are still fully functional Connec...

Page 13: ...drange more prominent This voicing can be compared to a vintage Tweed tone and can be tweaked by adjusting bass and treble slightly one way or the other Compared to the previous setting you will note...

Page 14: ...t the sound you hear is greatly influenced by the location of the amp in the room and by the orientation of the amp with respect to the listening position i e if the amp is pointing at you or away fro...

Page 15: ...amplifier If you experience a problem with your amplifier the first step in debugging involves consideration of the possibility of a tube problem I subject all tubes to a thorough burn in and test pro...

Page 16: ...ean without overdrive you may prefer to use a TAD 12AU7 in the U1 position It will significantly increase clean headroom and deliver a fuller fatter sound 12AU7 Tubes The preferred brand for 12AU7 tub...

Page 17: ...ctives and applicable Standards EMC Directive 2014 30 EU EN55032 2015 EN55103 2 2009 EN55024 EN61000 3 2 EN61000 3 3 Low Voltage Directive 2014 35 EU EN 60065 2002 A1 2006 A11 2008 A2 2010 A12 2011 Ro...

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