Advent 100 nru sm
This is the 23 pages manual for Advent 100 nru sm.
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Extracted text from Advent 100 nru sm (Ocr-read)
Page 1
SERVICE MANUAL
59va
cum"
In FLU
ADVENT MODEL 100
NOISE REDUCTION UNIT
Advent Corporation
377 Putnam Avenue
Cambridge, Mass. 02139
NRU 10-70
Page 2
PERFORMANCE AND ELECTRICAL SPECIFICATIONS
FREQUENCY RESPONSE:
Dolby Out: 20-20,000Hz +0 -ldb
Dolby In: 20-20,000Hz +l -2db
With MX FILTER "in" the upper limit is 15 kHz
DISTORTION:
Less than 0.5% THD @ Dolby Level, 20-20,000Hz
SIGNAL T0 NOISE RATIO:
(Measured straight through exclusive of tape deck)
-66db from Dolby Level
NOISE REDUCTION vs. FREQUENCY:
3db @ 600Hz
Sdb @ 1200HZ
9db @ ZHOOHZ
lOdb @ 4000Hz to 20,000Hz
INPUT SENSITIVITIES:
MIC: 0.5mv for Dolby Level @ 1000 ohms (50,000 ohms
after serial number 02800)
LINE: 60mv for Dolby Level @ 50,000 ohms
FROM TAPE RECORDER OUTPUT: lSOmv for Dolby Level @
50,000 ohms. (Adjustable
by PLAY CAL control)
OUTPUT LEVELS:
T0 TAPE RECORDER INPUT: Maximum 500mv for O VU
tape level @ 1000 ohms.
TO AMP INPUT: 1.0 V from O VU tape level,less than
1000 ohms output impedance.
MX FILTER:
less than ldb down @ lSkHz
greater than 30db down @ 19kHz
greater than 20 db down @ 38kHz
In open reel recording, Dolby Level is the same flux level
on the tape as Ampex Operating Level.
For cassettes, Dolby Level is defined as a flux level on
the tape of 200 nanoWebers per meter.