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1991年11月28日,北京市一轻工业总公司邀请在京的部分演奏家及乐器专家对北京民族乐器厂研制的”KJ-701型框架式爵士鼓”及其怀来响器分厂研制的“系列吊镲”进行了鉴定。 KJ-701型框架式爵士鼓,框架采用国产新材料LD31RCS铝合金型材,硬度HB>70;框架连接紧固件采用优质尼龙材料,表面光洁度高;改进了吊镲的配备。φ400吊镲改为φ450吊镲,φ310吊镲改为φ350吊镲,并增加了φ280高音吊镲;大鼓改铝制氧化压圈为新型镀铬压圈;配备的高级军鼓,鼓腔增高30毫米,鼓皮兰色透
On November 28, 1991, a light industrial corporation in Beijing invited some performers and musical instruments experts in Beijing to develop “Series KJ-701 Frame Jazz Drum” developed by Beijing National Musical Instrument Factory and its series “ Condolences ”were identified. KJ-701-frame jazz drum, the frame made of domestic new material LD31RCS aluminum alloy, hardness HB> 70; frame connection fasteners made of high quality nylon material, high surface finish; improved condos equipped. φ400 condolence to φ450 condolence, φ310 condolence to φ350 condolence, and an increase of φ280 treble condolence; Drum to change aluminum pressure ring for the new chrome-plated pressure ring; Equipped with advanced snare drum, drum cavity increased by 30 mm Drums blue through