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Up for sale is my barely used Swart AST Master combo with Celestion Gold ($200 upgrade and its worth it). Smooth and silky, rough and tough. All sorts of options with the master switch, reverb and tremolo. Pedal, cable and cover included. A few tiny dings, otherwise would be mint. Gigged very little and usually at about volume level 3. Time to let it go, just not using enough. Thanks for looking. Drew

The Swart AST Atomic Space Tone Master (also known as the AST Mk II Combo), is essentially the AST Head Mk II circuit and chassis in a combo form with top mounted controls like the Space Tone Reverb (STR) amps.

It features a defeatable master volume and can use 6V6 or 6L6 power tubes. Standard, it can come with the BV-25 speaker, but more common is the Celestion Anniversary or the Celestion Alnico Gold.  

The AST Master can also drive an external cab while running the internal speaker(s) as it has two external outputs with 4/8/16ohm selectable impedance.

The AST Master is a bit hotter than the original AST design with a bit more edge and a bigger sound due to the larger cab enclosure for the speaker.


  • 18 watts of 6V6 power in high Class A biased AB
  • Proprietary 100% Bypassable Master Volume
  • Tube Reverb/Tremolo
  • Run 6V6/6L6 
  • Hi/Lo inputs
  • Volume, Tone, Space (Reverb) Speed & Depth (Tremolo),and Master
  • Standby
  • Foot Switch
  • Dual Outputs
  • Carbon Comp Resistors
  • Mallory, Sprague, JJ Caps
  • Channel 1&2 Outputs to drive internal/external cabs
  • 4/8/16 ohm selectable Output
  • Dimensions:  24"w x 11"d x 20"h 
  • Weight:  39lbs

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Listed4 months ago
ConditionExcellent (Used)
Excellent items are almost entirely free from blemishes and other visual defects and have been played or used with the utmost care.learn more
  • AST Master Combo
  • Tweed
  • 2013
Made In
  • United States


Bainbridge Island, WA, United States
Joined Reverb:2014

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