Need good book on "TroubleShooting" 1970's HiFi .

Hey out there, bruce here, doe's anybody know of any good books/lititure on trouble shooting, maintance, repair and general info on 1970's stero equipment. Mainly late 70's recievers(Pioneer, Marrants),also ampes and turntables would be good too. Not to theoretical, more hands on. All I need is the name of the auther or tital and i can look it up in ABE to find it. Well this is surly a great site to interact with people of simular interests. thanks bruce