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. This machine is in immaculate
cosmetic,
electronic condition and is still in use today.
Ampex Logo
used by
permission of: Ampex Corporation
©
2018 Greg Youngman Music