used whitey's 6000 series 2,and 3 detectors throughout the 80's the meters were very accurate, and the 4 pole filter designs were very deep.toward the end (88) used whitey's first eagle.did well with all of them.have to be honest, and say
the series 2 and 3 detectors were somewhat lacking in separation, however,the great 5.3 small coils were better in the trash.

(h.h.!)
j.t.