American Cinematographer - December 1970 - 93

which normally indicates the degree of com¬
pression of the automatic level control. A
warning device causes the meter to zero in the
case of insufficient power voltage. A small
push button switches the meter to measure
the battery voltage.

3.2.7. Power Supply
The

SN

contains 2 AA

ADDITIVE COLOR
PRINTER

manganese cells

(easy to obtain since certain cameras use
them). The use of accumulators may be of
interest for intensive operation.
A specially invented circuit converts the
battery voltage to 5 V, stabilized. The con¬
version ratio varies automatically to obtain
optimum use of the available energy. It is, in
part, due to this device that such a high
performance with a good safety margin has
been obtained.

It's true, this is a special offer
until February 1, 1971 on our
"CT" series (3 manually posi¬
tioned lightvalvesfor basiccolor
and density balance). The prices
have been reduced for a limited
time-to encourage everyone to
GO ADDITIVE NOW!

3.2.8. Construction and Components
As far as possible, all the components are
of "military" quality. All 63 transistors are in
hermetically sealed cases. The electrolytic
condensers are all tantalum, also sealed. The
trimmers are cermet. When suitable compon¬
ents have not been available on the market,
they have been specially manufactured. This
is particularly so with plugs and sockets,
except for the earphone jack.

CONVERT LATER-the CT's are
easily converted for automatic,
tape-controlled, scene-to-scene
color balancing.

4. QUALITY OF RECORDINGS ON THE SN
4.1. Speed Stability

The CT's also have all the latest
Model "C" improvements in¬
cluding new lamp & lamphouse,
3000 ft. feed & take ups, swivel
caster base and front trim
controls. Prints at 180 fpm.

PROFESSIOHAL EQUIPmEHT DIVISIOH

The Nagra SN uses the same process which
rendered the Nagras III and IV famous.
However, as the dimensions are smaller, and
the mechanical tolerances the same, the performar e cannot equal that of the Nagra IV.

CALL

THE PRDS

7100 McCORMICK ROAD, CHICAGO. ILL. 60645 U S A.

FOR PRINTING
& PROCESSING
EQUIPMENT

312/673-3300

BELLS HOWELL

Neve' neless, the performance of the SN is
entirely acceptable, and this recorder can be
used for music.

4.2. Pass Band
The Nagra SN
records from
10 to
15,000 Hz. It is not desirable to go down as
low as 10 Hz for speech, and for this reason, a
high-pass active filter has been incorporated in
the SN to eliminate frequencies below 80 Hz.
This gives clear and agreeable speech whilst
substantially attenuating very low frequency
noise.
The overall frequency response depends on
tht
'crophone and the playback correction.

The new Ntellavox §p9 will become
a giant in the reconling industry.

"r'uie signal available on the earphone output is
linear up to 10,000 to 12,000 Hz. With the
external corrector amplifier SAC, 15,000 Hz
can be obtained, when so desired. It is also
possible to restrict the pass band to modify
the response curve in order to have optimum
subjective results. Any non-linearity during
recording (e.g. sounds modified by the micro¬
phone being too close to the body) may thus
be corrected.

All § lbs. of it.

4.3. Signal-to-Noise Ratio
Measured with an ASA "A" weighting
ter, the noise level is -60 db, compared with
1 a level giving 2% third harmonic distortion
a,
400 Hz. It is this characteristic which
sh
>s the real progress compared with other
mi
ture recorders.

4.4

lestrictions

cording on the SN is somewhat analogc ; to miniature photography: remarkable
res
s can be obtained, provided care is
ta)
i. The tape on the SN should be in
pe
ct condition: any fold or tear will cause
a
iuch more serious disturbance than a
st
io machine running at 1 5"/sec. The heads
f
uld be clean and properly aligned.

Up till now, perfect stereo location recording
meant lugging unportable portables.
So we've come up with a rugged precision in¬
strument, the Swiss-made Sp7. It's small-8"xl0"x
3". It's light-only 8 lbs. with batteries. And,
despite its size, Sp7's features measure up to any
portable you're now using..
Plus giving you several advantages you'll get
nowhere else, regardless of size.
Like four standard tape speeds. 3%, lVi, 15
and 30 ips. It is also continuously variable from
0-30 ips.
Another exclusive: Our many tape head assem¬
blies with up to four heads. They plug in. Are
quickly exchanged in the field. And each one con¬
tains the components to equalize the electronics
precisely for a particular tape speed, track config¬
uration and tape oxide. With Neo-pilot for mono

1ERICAN CINEMATOGRAPHER, DECEMBER 1970

and "Synchrotone" for stereo sync recording!
Then there's our 101/2"real adapter. It gives you
more recording time than any portable ever.
Plus: hands-off automatic stereo level control,
dual peak indicating meters, internal powering for
two condenser mikes, external AC supply and bat¬
tery charger, and an internal quartz generator.
We expect this tiny Stellavox Sp7 to live up to
the highest hopes of the industry. Because you
don't have to be big to be a giant.

SrcHavuX
exclusively by
AUDIO CORPORATION
2 West 46th Street, New York, NY 10036 (212) 265-4111
1710 N. LaBrea Avenue, Hollywood, CA 90046 (213) 874-4444

1239
American Cinematographer - December 1970

Table of Contents for the Digital Edition of American Cinematographer - December 1970
