Nagra CLASSIC PHONO User manual

P/N: 2055034159
All rights reserved –© 2020 rev1
CLASSIC PHONO
User manual

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Nagra –CLASSIC PHONO
Table of contents
Safety warning .....................................................................................................3
Warranty..............................................................................................................3
Congratulations....................................................................................................4
Package contents.............................................................................................4
Installation............................................................................................................5
Positioning........................................................................................................5
Powering the Nagra CLASSIC PHONO............................................................6
Connecting the Mains.......................................................................................6
Connecting the Nagra CLASSIC PSU...............................................................6
Connection block on rear panel ........................................................................7
Front panel.......................................................................................................8
Operations ...........................................................................................................9
Basic operations...............................................................................................9
Nagra Modulometer..........................................................................................9
Light intensity adjustment ...............................................................................10
Curve selection...............................................................................................10
Mono cartridge LED........................................................................................10
Mono/stereo mode selection...........................................................................11
Gain selection.................................................................................................11
Input setting .......................................................................................................12
Open/close the Nagra CLASSIC PHONO.......................................................12
Factory settings..............................................................................................13
Jumpers & switch functions ............................................................................14
Load circuits ...................................................................................................15
Load circuit installation....................................................................................15
External transformer usage.............................................................................16
Maintenance ......................................................................................................17
Tube ageing ...................................................................................................17
Case cleaning.................................................................................................17
Technical specifications .....................................................................................18
De-emphasis curves.......................................................................................20
Declaration of conformity....................................................................................21

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Nagra –CLASSIC PHONO
Safety warning
Read this manual carefully before operating the Nagra CLASSIC
PHONO;
Should you have any questions on how to setup or use your Nagra
CLASSIC PHONO, please contact your Nagra dealer;
Audio Technology Switzerland SA declines any responsibility in the
event of an accident caused by the non-observance of these
instructions or any other form of user negligence;
The Nagra CLASSIC PHONO is a CLASS I equipment. It is essential
that it is connected to a Mains socket outlet with a protective earthing
connection when using the AC power supply;
Never try to open your Nagra CLASSIC PHONO when it is powered to
prevent the risk of electric shock and burns. Switch it OFF, remove the
Mains or the external DC power supply cable from the back panel and
wait at least 10 minutes before any intervention into your Nagra
CLASSIC PHONO such as for tube exchange or input module
adjustments. If you are unsure, please contact your Nagra dealer.
Warranty
Audio Technology Switzerland SA certifies that this device has been inspected
and tested before leaving the factory.
Every Nagra unit goes through our test laboratory. The result of the
measurements is recorded in the “Protocol” documentation that comes with your
device.
We guarantee our products against all manufacturing defects, for a period of three
years for the Nagra CLASSIC PHONO and six months for the tubes, running from
the date of delivery to the customer (validated by the serial number on the device
casing and the invoice from an official Nagra dealer). This warranty is only valid
for the original purchaser of new equipment.
This limited warranty covers the repair and replacement of defective parts,
excluding any other remedy.
The absence of a serial number invalidates the warranty.
We decline any responsibility for damages resulting directly or indirectly from the
use of our products and from the use of any components or spare parts other than
those designated as original/approved parts by Audio Technology Switzerland
SA.
As we constantly strive to improve our products, we reserve the right to modify
them or change their specifications without notice.

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Nagra –CLASSIC PHONO
Congratulations
Congratulations! You have just acquired one of the best ever phono preamplifiers.
The Nagra CLASSIC PHONO was created by an engineering team with more
than 60 years’ experience designing world-class products for the professional
audio, national security and military businesses.
Ever since its creation in 1951, Nagra builds devices that offer exceptional sonic
performance. The company has received many awards for its technical
innovations and the excellence of its products. Among the most prestigious,
Nagra has been awarded two Oscars® and two Emmy®.
The professional and Hi-Fi ranges are designed by the same Research and
Development department. Nagra has launched a Hi-Fi range to allow the wider
public to benefit from technical advances that are often the privilege of the
professionals.
This technology exists in the service of music, your music. This is why we already
wish you some great moments of listening pleasure with your Nagra CLASSIC
PHONO.
Thank you for your trust.
Package contents
Besides the manual and the Nagra CLASSIC PHONO itself, the box contains:
Mains cable*;
Record of measurements, response curve characteristics for your
device, measured by the Nagra laboratory;
Pair of “Haute Horlogerie” grade microfiber gloves;
Allen key to open the top panel;
12 black plastic jumpers;
6 load circuits in their box;
2 spacer screws to secure the load circuit;
Please contact your Nagra dealer if anything should be missing.
* Depending on the country of purchase, the cable supplied by Nagra will feature
an European, Swiss or US plug.

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Nagra –CLASSIC PHONO
Installation
Positioning
The Nagra CLASSIC PHONO must not be exposed to dripping or splashing
liquids and no objects filled with liquids, such as vases, should be placed on the
machine. Use exclusively indoors in a moderate climate.
There must be enough space all around the chassis for adequate ventilation.
Ventilation should not be impeded by covering the ventilation openings with items
such as newspapers, table-cloths, curtains, etc.
The Nagra CLASSIC PHONO must rest on a stable support. We recommend that
you use the anti-vibration support, the Nagra CLASSIC VFS FOR SOURCE,
Vibration Free Support for source, developed by Nagra consisting of isolated solid
aluminum plates using the same silicon base damping material as the Nagra CD
mechanics.