1953
50-C
The World’s Foremost Audio Control Instrument – Designed for use with any Amplifier
1955
1956
1957
70-T
Basic Preamplifier
PR-6
Basic Preamplifier
1958
80-T
Basic Preamplifier
90-C
Master Audio Control
1959
90-T
Basic Preamplifier
PR-66
400-C
1960
400-CA
202-T
100-T
1961
400-CX
Stereo Master Audio Control 27 controls! 18 inputs! Eliminates all barriers to total flexibility!
1963
400-CX
Laboratory Standard Series Stereo Master Control and Preamplifier.