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问:一台F—9300BⅡ型功放机,其中对管B693、D729均损坏,请问其主要特性及可直接代换型号。(广西覃利国)
Q: A F-9300B Ⅱ power amplifier, in which the tube B693, D729 are damaged, may I ask its main features and can directly substitute models. (Guangxi Qin Li country)