Quad 405
1978
Quad 33
1978
Quad 306
1986
Onkyo TX-560
1974
Quad FM3
1978
Onkyo Model D-312E
2006
Stax Quattro-II
1988
Stax DA-80
1976
Quad 34
1984
Quad 909
1999
Quad 44
1984
Onkyo A-7090
1980
Quad 405-2
1982
Quad II amplifier
1953
Quad 303
1967