Long-lived, space-based cryocoolers with low vibration levels are necessary in a variety of applications, including the cooling of infrared sensors and high Tc superconductors. A thermoacoustic refrigerator designed to function autonomously in a Space Shuttle Get Away Special (GAS) canister will be described that has no sliding seals and oldy 15 gm of reciprocating mass. It is capable of cooling to 100 K below room temperature with a single stage “stack” consisting of rolled plastic film and short lengths of 10-lb test monofilament fishing line as the spacers. This presentation will concentrate on the modifications to the basic refrigerator design (U.S. Patent No. 4,722,201, issued 2 Feb. 1988) that improve both its electroacoustic and thermoacoustic efficiencies. These improvements include the use of a helium-xenon gas mixture as the thermodynamic working fluid and a neodymium-iron-boron electrodynamic driver with a titanium suspension. Custom electronic circuits necessary to control the refrigerator (microprocessor, bubble memory data recorder, phase-locked loops, automatic gain controls, amplifiers, multiplexed diode thermometers, etc.) and special fabrication techniques necessary to confine the helium for years while permitting electrical feed through will also be disclosed. [Work supported by the Office of Naval Research, Office of Naval Technology, and the Naval Postgraduate School Research Foundation.]