Eimacs removed from medical service after hour-limit reached. Tested on standard medical electronics test fixture and found INDISTINGUISHABLE FROM NEW electronically and in output. Will sell with test data, $275 for one, $495 for two, shipped anywhere in lower 48. Have dozens in amateur use without a failure. By far the "Best Buy" for your 8877 amp (I use them myself). Tks es 73 to all! Jan N0JR