Country of Manufacture:USA
Speeds: 7 1/2, 15
Max Reel Size("): 10.5"
Number of heads: 3
Head Composition: Permalloy
Head Configuration: Mono - Full Track
# Motors: 3
Frequency Response:(±2 dB): 40 - 15,000Hz at 15 ips. 50 - 9,000Hz at 7½ ips
Wow and Flutter:0.1% RMS at 15 ips. 0.2% RMS at 7½ ips
Signal-to-Noise Ratio:measured at 400Hz @ 3%THD - 55dB
Sound quality rating:5 / 10
Long-term reliability rating: 6 / 10
The 1951 Network recorder (NWR) was designed primarily for professional use in broadcasting situations. It featured direct capstan drive from a dual speed hysteresis-synchronous motor, dynamic braking, push-pull design in erase bias, record and playback circuitry and space for up to five heads.
This was an incredibly sturdy and stable machine – the drive mechanism and erase bias oscillator was mounted on a rigid cast aluminium panel. Shock-mounted solenoids facilitated positive operation of braking system and drive pressure rollers. The drive capstan was precision ground from Chromalloy and balanced torque take-up and supply motors ensured smooth winding.
The head mounting bracket was removable and made of magnetic shielding material with hardened steel inserts for alignment screws. The heads were adjustable in height, longitudinal angle and lateral angle and adjustment of azimuth could be made while the recorder was in operation.
Bayonet hub locks were used to fasten reels of up to 10½ inches in diameter.