Nagra 300 Series User manual
P/N: 2055023151
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300i – 300p
Ultimate 300B amplifiers
I structio ma ual
2
Nagra – 300i / 300p
Table of co te ts
Security war i gs ....................................................................... 3
Warra ty ................................................................................... 3
Co gratulatio s .......................................................................... 4
Package co te t ......................................................................... 4
Setti g-up the amplifier ................................................................. 5
I troductio to set-up ................................................................. 5
Remote device umber a d RC-5 ................................................. 5
Assembli g the amplifier ............................................................. 6
I stalli g the tubes..................................................................... 8
Placi g the tube protectio s......................................................... 9
Co ectio s ............................................................................. 10
Audio i puts ............................................................................ 10
Loudspeaker output .................................................................. 11
Mai s power co ectio ............................................................ 11
Grou d post ............................................................................ 11
Operati g the amplifier ................................................................ 12
Fro t pa el .............................................................................. 12
Rear pa el ............................................................................... 13
How to tur the amplifier ON ..................................................... 14
Cautio to use for the first power o ........................................... 15
How ofte to adjust the bias ...................................................... 15
I stalli g ew tubes ................................................................. 15
Adjusti g backlight a d LED i te sity ......................................... 16
I put selectio ......................................................................... 17
How to use Nagra remote co trol (with 300i o ly) ........................ 18
Load match meter .................................................................... 19
Readi g the modulometer ......................................................... 20
Case clea i g .......................................................................... 20
A ex 1 - Troubleshooti g ........................................................... 21
A ex 2 - Bias setti g ................................................................. 23
A ex 3 - Replaci g the fuse ........................................................ 25
Tech ical specificatio s ................................................................ 26
3
Nagra – 300i / 300p
Security war i gs
•Carefully read this ma ual before i stalli g your ew 300i / 300p;
•Should you have a y questio s o how to set-up or use your amplifier,
co tact your Nagra dealer;
•AUDIO TECHNOLOGY SWITZERLAND SA decli es all respo sibility i
the eve t of a accide t caused by the o -observa ce of these
i structio s or a y other form of user eglige ce;
•Do ot attempt to ope the u it u der a y circumsta ces. Refer a y
service/repair work to qualified perso el. There are o user
serviceable parts i side the amplifier;
•Should you eed to ship or tra sport your amplifier, always use the
origi al packi g supplied by Nagra.
Warra ty
AUDIO TECHNOLOGY SWITZERLAND SA, certifies that this i strume t was
thoroughly i spected a d tested prior to leavi g its factory a d is i accorda ce
with the data give i the accompa yi g measureme t protocol a d test sheet.
We warra t the products of our ow ma ufacture agai st a y defect arisi g from
faulty ma ufacture for a period of three years from the date of delivery to the
user.
Warra ty will be void if the serial umber has bee removed from the u it.
This limited warra ty covers the repair of co firmed defects or, if ecessary, the
replaceme t of the faulty parts, excludi g all other i dem ities.
All freight costs, as well as customs duty a d other possible charges, are at the
customer's expe se.
We decli e a y respo sibility for a y a d all damages resulti g, directly or
i directly, from the use of our products.
We reserve the right to modify the product, a d / or the specificatio s without
otice.
Disposal of Old Electrical & Electro ic Equipme t (Applicable i the
Europea U io a d other Europea cou tries with separate collectio
systems).
This symbol o the product or o its packagi g i dicates that this
product shall ot be treated as household waste. I stead it shall be
ha ded over to the applicable collectio poi t for the recycli g of
electrical a d electro ic equipme t. By e suri g this product is
disposed of correctly, you will help preve t pote tial egative
co seque ces for the e viro me t a d huma health. The
recycli g of materials will help to co serve atural resources. For more
detailed i formatio about recycli g of this product, please co tact your
local authority, your household waste disposal service or the shop where
you purchased the product.
4
Nagra – 300i / 300p
Co gratulatio s
Co gratulatio s, you have just purchased o e of the best 300B amplifiers ever
made!
The 300i a d 300p were created by a e gi eeri g team with more tha 60 years
of experie ce desig i g world-class products for the professio al audio, atio al
security a d military busi esses.
Si ce its i ceptio i 1951, Nagra builds products that co ti ue to ear a
reputatio for deliveri g ultimate so ic performa ce. Numerous awards have
bee bestowed upo Nagra for its tech ical i ovatio , excelle ce i desig a d
flawless co structio i cludi g three Oscars
®
a d o e Emmy
®
.
The Hi-Fi products a d field recorders are developed by the same R&D
departme t. Nagra philosophy is to provide i ovatio a d tech ology i order to
desig high quality products. The Hi-Fi ra ge was created to impleme t
i ovative desig s a d provide Nagra expertise to a ew field.
Tha k you for bei g our customer a d e joy your ew 300B amplifier
!
Package co te ts
I additio to the user ma ual:
•300i or 300p mai u it;
•Tra sformer block;
•1 mai s cable *;
•VFS vibratio free support;
•Set of spare fuses;
•Hex screwdriver (to assemble the tra sformer block);
•Set of 5 screws (to assemble the tra sformer block);
•Ceramic screwdriver (to adjust bias);
•Microfiber gloves (from Swiss Haute Horlogerie);
•Measureme t protocol, this is the actual electrical measureme t of
your amplifier;
•For the 300i a RCU-II Nagra remote co trol with a 9V battery
a d its screwdriver.
If a ythi g is missi g, please co tact your dealer.
*depe di g o your cou try, the AC mai s cable features either bare wires, US,
Europea or Swiss plug.
5
Nagra – 300i / 300p
Setting-up the amplifier
I troductio to set-up
It is recomme ded to wear Nagra gloves to ma ipulate the amplifier a d the
accessories. It is ma datory whe ha dli g the 300B tubes as ha d pri ts ca
affect the tube i the lo g-term.
Place the amplifier o the VFS platform o a perfectly flat a d stable surface.
Provide e ough space above the amplifier to allow air to circulate as the tubes
ru quite hot.
Remote device umber a d RC-5
If you wish to cha ge the amplifier device umber or if
you wa t to use a RC-5 compatible remote, do so
before assembli g the amplifier.
By default, the 300i device umber is 5. You may cha ge this
setti g to a y umber from 1 to 6.
Usi g Nagra gloves, tur the amplifier upside dow a d put it
o a soft surface.
Remove the plastic protectio that hides the access hole to the
selector.
Usi g the ceramic screwdriver,
cha ge the selector to the
desired umber.
Selector position
Device
0
Code
Category
Group
Philips RC
-
5
Preamp Audio 1
16
1
to
6
Nagra
device umber
6
Nagra – 300i / 300p
Assembli g the amplifier
Three guide holes will help you to slide the tra sformer block i to positio .
These short rods fit i to the guide holes.
7
Nagra – 300i / 300p
Be careful to place the block vertically above the amplifier’s base. Place the rods
i the guidi g holes a d push ge tly u til the block is fully co ected.
I this picture you ca see the guide rods bei g i serted i to the base.
Whe reachi g the base, the tra sformer co ector will eed a extra push to be
i serted i the base co ector, this is perfectly ormal.
Inserting the block screws
Usi g the screwdriver provided,
place the three fixi g screws to
hold the tra sformer i place (the
set i cludes two spare screws).
8
Nagra – 300i / 300p
I stalli g the tubes
Tubes are umbered from 1 to 4.
O your ew amplifier, the Nagra Laboratory has already setup the bias, so be
careful to respect the tube placeme t.
The tube umber is writte o the back of each tube co ector o your amplifier,
as well as o the back of each tube base.
Spare tubes provided by Nagra ca be placed i a y positio as you will adjust
the amplifier’s bias to their specificatio .
Please ote the larger pi positio .
Prior to inserting the tubes, make sure the pins are in the right position.
Should ou have an doubt, remove them and start again.
1
2
3
4
9
Nagra – 300i / 300p
To i sert the tube, hold its base a d push dow ,
use the glass part to guide the tube but ot to
push, as the glass is fragile.
The amplifier features a thermal glass epoxy
plate to avoid a y miss-i sertio .
To remove tubes, pull them by the base a d ot
by the glass part.
Warning: placing the tube in a wrong
position can damage the amplifier and thus
the warrant will be void.
Place tube protectio s
The amplifiers are delivered with a set of
tube protectio s made from Pyrex glass
(desig ed to resist the heat).
The protectio ’s base is i iro a d will
be attracted to the amplifier deck by
mag ets.
Place the iro part i to the gutter.
Tube protectio s are desig ed to avoid a y co tact with the hot tube that could
provoke serious i juries. Be careful with the you gest music lovers.
10
Nagra – 300i / 300p
Co ectio s
Your amplifier is ow ready to be co ected to your system. We recomme d
doi g all the audio co ectio s before pluggi g the power cable i .
Audio i puts
The 300i features 4 i puts:
A
symmetrical o XLR
co ector
B & C
Asymmetrical o RCA (CINCH), 2 V rms max.
D
Asymmetrical o RCA (CINCH), 4 V rms max.
The 300p features a
choice of symmetrical o
XLR or asymmetrical o
RCA (CINCH).
Its maximum i put level is
2 V rms.
Use the white jumper to
select XLR or RCA i put.
O this picture, the i put is o RCA.
This manual suits for next models
2
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