Category:Vintage (Pre 1960, some recorders were so good, they belong in above categories)
Country of Manufacture:USA
Release dates:1950 - 1953
Speeds: 7 1/2, 15
Max Reel Size("): 10.5"
Number of heads: 3
Head Composition: Permalloy
Head Configuration: Mono - Full Track
Frequency Response:(all 2 dB): 15 ips: 30-15kHz
Wow and Flutter:15 ips less than 0.1 % RMS 7½ ips less than 0.2% RMS
Signal-to-Noise Ratio:over 70db
Sound quality rating:4 / 10
Long-term reliability rating: 4 / 10
Extract from original brochure…
The requirements of the professional recording market make it imperative that the master tape be free from wow & flutter. This can only be achieved by the Ampex 300 recorders, whose wow & flutter characteristics are so low as to be practically eliminated.
Even when pyramided through several generations, flutter & wow are still far too low to be audible.
Precision alignment Ampex Multi-Channel recorders add an addition element of quality:
the precision manufacture and alignment of the Multi-Channel heads.
They are so perfect, so uniform, that tapes recorded on one Series 300 machine can be played with perfect results on any other Ampex (anywhere in the world) without phase shift between channels.
Inter-channel crosstalk rejection: (2 channel stereo) Exceeds 55db at 400Hz / Timing accuracy: within 0.2% (3.6 seconds over 30 minutes) / Starting & Stopping times: Start: 1 / 10th sec to full speed Stop: At 15 ips, tape moves less than 2″ when stopped / Rewind speed: one minute for the full NAB reel (2400ft) / Recording amplifier: 10,000 ohm bridging input, normally set up for +4 VU or unbalanced / Playback amplifier: adjusted for +4 VU output, 600 ohms or 150 ohms balanced or unbalanced / Dimensions: mechanical unit on 24″ panel and electronic unit on 12″ panel / Weight: console 270 lbs, 2 case portable 175 lbs, rack 140 lbs / full track