PIONEER : Electronic Crossovers      
YearF F YearL L Model R Related Cost C Model Type Info Info2 Family
1976 W 1980 A D-23     600 $ Electronic Crossover     Series 20
1977 X 1980 A D-70     45000 Electronic Crossover      
1969 P 1972 S SF-50   SF-500   Electronic Crossover      
1970 Q 1973 T SF-70   SF-700   Electronic Crossover     Tube?
1973 T 1975 V SF-500   SF-50 80 $ Electronic Crossover      
1970 Q 1973 T SF-700   SF-70 180 $ Electronic Crossover     Tube?
1974 U 1978 Y SF-850     200 $ Electronic Crossover      
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