The NagraMaster Box
Instructions for Setup
Notes on the
NagraMaster EQ circuit:
This circuit is intended to equalize the output of a 1/4 inch tape machine when used with
NagraMaster tapes. It is engineered to be placed between the output of the machine, such
as an OTARI MTR 10/12, AMPEX, FOSTEX or MCI 1/4 inch tape recorder and the bridging input
of the transfer machine or mixing board. If the circuit is terminated with a low impedance
such as 600 ohms, it will not work correctly.
How to use the filter:
1. Align the tape machine with a standard NAB alignment tape for 15ips.
Connect the filter (NM
Box) between the tape recorder and the transfer machine
or mixing board.
Play a tone-tape made
using the NagraMaster EQ on a Nagra recorder that
contains a 1KHz reference and a 10KHz reference recorded at exactly -8dB
on the modulometer of the Nagra tape recorder.
4. Set the 1KHz tone at '0' VU on the transfer machine or the mixing board.
REFER ONLY TO THIS METER FOR THE FOLLOWING STEPS!!!
5. Play the 10KHz tone and trim the trimmer pot of the circuit to make a '0' VU
output on the transfer machine or mixing board.
6. Check the 1KHz tone and reset to '0' VU if necessary. Check the setting
trim pot at 10KHz and trim if necessary.
NOTE: you will notice that the 10KHz tone on the
tape recorder meters will pin.
That is why you need this
William Harvey © 1996.
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