stereo preamplifier การใช้

• McIntosh produced a limited commemorative edition of its Model 275 amplifier, and Marantz has come out with reissues of its Model 7 stereo preamplifier, Model 8B stereo power amplifier and Model 9 monophonic power amplifier.
• In 1958, the sound-reproduction world was shaken by the introduction of stereo, and 927s and 930s were quickly adapted to the new system with stereo cartridges, appropriate rewiring of the tonearm and the new stereo preamplifier  139st; it was phased out of production when the more modern solid-state  155st arrived, in 1960.