Revox C270

Technical appendix
Equalizations (IEC, NAB)
30
9,5cm/s
3,75 ips
For correcting the frequency response, inter-
nationally standardized equalization networks
are built into the record and reproduce path of
the tape recorders.
The attack points of the correction are re-
ferred to as transition frequencies or transition
time constants and depend on the tape speed.
They have been standardized by various orga-
nizations (IEC, NAB, AES, CCIR) as follows:
TRANSITION FREQUENCY, LOW AND HIGH
(TRANSITION TIME CONSTANTS)
IEC -1968
NAB - 1965
50 Hz; 1768 Hz 50 Hz; 1768 Hz
(3180s; 90s) (3180 us; 90ps)
19cm/s
7,5ips
38cm/s
15ips
OHz; 2273 Hz
(ee; 70 us)
50 Hz; 3183 Hz
(3180s; 50us)
OHz; 4547 Hz
(ee, 35 us)
50Hz; 3183 Hz
(3180s; 50us)
On the C270 tape recorder, the equalization
networks are plugged into the RECORD
EQUALIZER BOARD 1.777.540.00 and the
REPRODUCE EQUALIZER BOARD
1.777.620.00. Due to this design it is possible
to
convert
or
recalibrate
your
recorder
to
dif-
at
speeds
or
the
other
equalization
stan-
ard.