Ampex Corporation introduced the model 300
multi-channel magnetic tape recorder in 1949. Early users of these
machines concentrated primarily on the development of stereophonic recording
techniques, but it was soon apparent that multi-channel recorders were
opening the way to a wide variety of other applications. During 1957,
Ampex began to market half-inch three channel model 300 recorders using
high crosstalk rejection, cast-construction head assemblies.
Model 300-3C-SS
Three-channel console type recorder/reproducer
with sel-sync control panel.
In the late 60's, early 70's, many older Ampex tape machines were being upgraded from tube-type to solid-state record/play electronics. Most upgrades were done using the latest MCI electronics. For this Ampex 300 upgrade, Inovonics 355 R/P electronics were used. Inovonics were chosen over the MCI's for many reasons: two fully independent channels in a single 3½" rack mount chassis; 3-speed equalization accommodating any combination of NAB or IEC curves; full remote control of all modes using solid-state switching; reduced distortion through the use of "linearized" recording amplifiers and phase corrected reproduce/sync amplifiers; separate reproduce and sync amplifiers; plug-in circuit cards. Typical specifications for this machine are: Frequency Response @ 15ips 30-20kHz +/- 2db; Signal-to-Noise Ratio @ 15ips 69db weighted; Recorded Distortion <.15% THD @ 200nW/m, <1% THD @ 6db above 200nW/m. This Ampex 300 ½" 4 track was purchased from the original owner in 1968. It was modified with Inovonics 355 Record/Play electronics in 1971. Tape speeds are 7.5-15-30 i.p.s. Notice the stationary tape guides have been replaced with custom roller-type for reduced wow and flutter and tape wear. This machine is in immaculate cosmetic, electronic condition and is still in use today.
Ampex Logo used by permission of: Ampex Corporation
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1996-2006 Greg Youngman Music