Nagra PORTABLE ANALOGUE AUDIO TAPE RECORDER Instruction Manual - page 53
TAPE TRANSPORT
Switchable nominal speeds
15 ips
38.10 cm/s
7½ ips
19.05 cm/s
3¾ ips
9.525 cm/s
Stability of the nominal speed with respect to the temperature (within the specified range), the
position of the recorder, the distribution of the tape between the reels, and the supply voltage ±0.1%
WOW AND FLUTTER
Weighted peak-to-peak value, in accordance with
DIN 45 507/ANSI 4372
at 15 ips
38.10 cm/s
±0,05 %
at 7½ is
19.05 cm/s
±0.07 %
at 3¾ ips
9.525 cm/s
±0.12 %
AMPLIFIER CHAIN
NAGRA 4.2 with QPSE-200-XOYO preamplifiers
Overall frequency response, 200 Ohm microphone
input, line output without load from 50 Hz to 20 kHz
±1 dB
Total distortion at 0 dB, 10 mV input, output load 600 Ohm <0.3 %
Input voltage for 1% distortion at 1 kHz
65mV
Noise level of the microphone preamplifier, ASA A
Weighted, 1 mW reference
-126 dBm
MAGNETIC TAPE
Width
6,25 mm
Mixer direct input, impedance 9 k Ohm,
voltage for recording at 0 dB
560mV
Pilot input, impedance 5 k Ohm,
admissible voltage
0,5 to 25 V
AUTOMATIC LEVEL CONTROL
Input voltage for recording at nominal level
0.65 to 22 mV
Average distortion at 1 kHz within this range, 3rd harmonic
0,3%
Frequency response from 55 Hz to 16 kHz
±1.7 dB