Scully 280B Series - Models of 280 B Series Recorder;Reproducer

1-2
General
Information
Model 280B
Table 1-1. MODELS OF 280B SERIES RECORDER/REPRODUCER
MODEL
NUMBER
DESCRIPTION
TAPE WIDTH
(INCH)
280B-FT
One-Channel, Full-Track (Mono) 0.25
280B-l
One-Channel, Two-Track (Half-Track Mono)
0.25
280B-2 Two-Channel, Two-Track (Stereo)
0.25
280B-4 Four-Channel, Four-Track (Quad)
0.50
280B-24 Two-Channel, Four-Track (Quarter-Track
Stereo)
0.25
280B-44
Four-Channel, Four-Track (Quad)
0.25
Table 1-2. SPECIFICATIONS
Frequency Response Using 3M 206 tape, or equivalent:
in/s
cm/s Frequency Response
30.00 76.2
±2 dB at 50 Hz to 20 kHz
15.00 38.10
±2 dB at 30 Hz to 18 kHz
7.50 19.05 ±2 dB at 30 Hz to 15 kHz
3.75 9.52
±2 dB at 30 Hz to 10 kHz
Signal-to-N oise
Ratio
Using 3M 206 tape, or equivalent, at peak record
level of 500 nWb/m, with weighted noise and
equalization:
Full Half Two
Four Four
in/s
Track
Track
Track Track
Track
0.25"
0.25"
0.25"
0.50"
0.25/1
30.00
72 dB 68 dB
68 dB 68 dB 65 dB
15.00
72 dB 68 dB
68 dB 68 dB 65 dB
7.50 72 dB
68 dB 68 dB 68 dB
65 dB
3.75
68 dB 64 dB
64 dB 64 dB
61 dB
Flutter and Wow
Weighted
peak flutter (ANSI S4.3, 1972; lEC 386, 1972)
in/s
DC Servo
AC Motor
30.00 0.04%
15.00 0.04%
0.08%
7.50 0.05%
0.10%
3.75 0.10%
0.20%