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-SSThree-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 3" 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 " 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

2015 Greg Youngman Music