The stack and heat exchangers from the historic Five Inch Engine [G. W. Swift, J. Acoust. Soc. Am. 92, 1551 (1992)] have been joined to a 2.02-m long resonator tube terminated by a variable acoustic load [A. M. Fusco et al., J. Acoust. Soc. Am. 91, 2229 (1992)]. Operation in 20-bar pure helium delivered 160 W to the load with an electrical heat input of 2.76 kW, producing a hot-end external duct temperature of 655<th>°C. Applied heat measuring 1.41 kW was exhausted through the cold exchanger to a water stream at 25<th>°C, with the remaining power producing useful work or otherwise lost by conduction through the engine and to the surroundings. Measured acoustic pressure amplitudes for electrical heat inputs in the range from 348 to 2773 W agreed with the deltae model to within 12%, but the error in the hot-end temperature prediction was 25%. The engine was then attached to a CFIC Model B-300 electrodynamic motor/alternator to explore feasibility of distributed power generation and co-generation. [The loan of the 5-in. engine, by G. W. Swift, Los Alamos National Laboratory, is gratefully acknowledged. J.L. and S.L.G. were supported, in part, by ONR.]