Audio Valve BALDUR 300 User manual

INSTRUCTION
BALDUR 300
High Power, high current class -a triode amplifier
This handcrafted product was special made for your high
demands,
to display the music on its finest way.
We guarantee, that this amplifier was carefully produced
and tested in all details.

BALDUR 300 triode power amplifier
Congratulations on your decision to become the proud owner of the AUDIO-
VALV Baldur 300 power amplifier.
This manual has been prepared to help you understand the operation of your
amplifier and to provide some information about its design and the variety of
ways it may be used.
We have designed and manufactured this amplifier to faithfully and accurately
reproduce music. This hand build instrument should give a lifetime of pleasure
and with a little care and a full understanding of the operation recommendation
in this manual the Baldur 300 should provide trouble free performance.
Please take time to read this manual
thoroughly before using your amplifier.
There should be two persons grabbing the outer rim of plexiglas
top to lift up, rest on edge of crate then continue all lifting
from the bottom of the chassis.
List of contents
- Warning and precautions
- Front panel - rear panel
- Drawing front panel
- Drawing rear panel
- Input - output terminals
- Polarity - phasing
- Installation and operation
- Automatic bias control ( ABR )
- Specifications

BALDUR 300 triode power amplifier
WARNING
This amplifier Baldur 300 operates in class - A and is
therefore capable of generating a moderately high temperature which
requires care full placing to aviod any effect this heat may have on other
equipment, funiture and fittings etc.
Do not remove the top cover from this amplifier.
Hazardous voltages are present. Any repair work should
be refer to a suitable qualified and experienced
service person.
Do not attempt to connect any input of this amplifier to
any of its outputs.
Do not earth any output terminal or connect any of these
terminals together without following the instructions in
this manual or seeking qualified assistance.
Do not place this amplifier in any position where liquids
or any foreign material may accidentally enter it.
Do not disconnect any in / output wire, while the amplifier is
operating.
Do not connect any voltage source short circuit, earth / ground or
appliance (other than suitable HiFi quality loudspeakers ) to any output
terminal.
Some preamplifiers, processor, CD players etc produce
large switching pulses when switched on, causing a loud
click through the loudspeakers. For this reason, turn on
all other equipment in your system before turning on the
Baldur 300.
Note: the Baldur 300 power amplifier do not cause this problem.

BALDUR 300 triode power amplifier
FRONTPANEL
The front panel of the Baldur 300 power amplifier
incorporates with a small panel filled with two switches.
These switches control the day to day function of the amplifier.
The operation of this two switches is like following:
MAIN SWITCH
This heavy duty rocker switch is at the right side
of this panel and switched the mains / line power of the
amplifier On or OFF. A blue L D immediatly beside the
switch illuminates to indicate that the power is ON.
This amplifier draws to moderate high current when
switched on. It is not good practice to repeatedly
active this switch ON and OFF rapidly.
STAND - BY SWITCH.
This switch on the left of the panel alters the operation
STAND BY of the amplifier. Switch down is operation
STAND BY , ( the left blue L D is off).

BALDUR 300 triode power amplifier
POWER
OPERATE
Please read the following safety notes:
Please notice that you never exceed the mains voltage in the prescribed
value shown at the lable of the serial number on the rear side. If you
can`t provide the amplifier with the exact shown main voltage, please use
a voltage stabilizer - particulare for the U A.
The amplifier needs a certain time to form the brand new
components (capacitors) otherwise they can be destroyed.
For the on and off mode of the amplifier please do only use the main
switch, the operate switch is currently in on position. ( LED is lightining)
Use the tand - By mode (OPERATE - off) only for short periodes, max. 1
hrs. During long periodes switch the equipment off completely.
Do not leave your house with switched on equipment, or during sleeping
time.
Please only do use your amplifier while listening to music.

BALDUR 300 triode power amplifier
REAR PANEL
The facilities on the rear panel of the Baldur 300 may
seem not so complex. The rear panel incorporates all
of the terminals for connecting the input signals and
the output signals to the loudspeaker. A reasonable
understanding of this amplifier and the logical approach
should ensure that you are listening to this amplifier in a
very short space of time without any difficults at all.
Please remember that the AUDIOVALV Baldur 300
power amplifier is a high quality electronic instrument
capable of an exeptional level of performence.
Be sure that you understanding your requirements fully
before you make any connection to this amplifier.

BALDUR 300 triode power amplifier
Main Power
S p e a ke r
RCA
XLR
8 ohm
4 ohm
+
+
-
-
H a n d c ra fte d b y A ud io Va v e - Ge rm a ny
C A U T IO N : D i s c o n n e c t m a i n p o w e r b e fo r s e rv i c i n g !
CE
Model:
er.-No.:
Voltage:
Power consumption:
Fuse:
BALDUR 300
Fuse
INPUT TERMINALS
Input terminals for this Baldur 300 power amplifier are easily
accsessible and fitted to the lower centre area of the rear panel.
RCA INPUT. These standard type of RCA terminals are for
use with unbalanced signals from most signal sources such as
audio preamplifiers.
fake XLR BALANCED INPUT. XLR connector fitted to
the amplifier are for use with balanced line signals from
audio pre amplifiers etc. Balanced signals are carried
via a three way cable that connects all three pins at each
of the interconnect cable.
DO NOT operate this amplifier with both RCA and XLR
cables connect at the same time.

BALDUR 300 triode power amplifier
OUTPUT TERMINALS
Output connections for the Loudspeakers are provided on the
lower centre of the rear panel. Two pairs of heavy duty
gold plated binding posts for each cannel are supplied.
CONNECT your loudspeaker positive terminal to the
amplifier (+) output terminal. Connect your loudspeaker
negative terminal to the ( - ) output terminal.
+++ importend note for speaker terminal connection +++
please use the 4 ohm terminals for speakers with an impedance from
2 - 6 ohm, and use the 8 ohm terminals for speakers impedances
between 6 – 12 ohm and higher.
POLARITY - PHASING
It is important to achieve good stereo imaging in your
listening room. By observing the wiring constructions
above, each power amplifier / loudspeaker combination
should be in phase. If you experience a poor stereo
image and / or a lack of bass, check that the loudspeaker
wiring has been connect correctly. We recommend that
you use one of the easily obtainable "test - disc" to help
you ensure both phasing and channel orientation are correct.
If in doupt, consult your AudioValve dealer for advice.
Do not make any other connection to any of the amplifiers
negative or positive output terminals. Only the minus terminal from
the 8 ohm terminals has ground polarity, all the other has life signal
phase
Quality of the connections must be examined to ensure a high
performence trouble free operation is enjoyed. Check that the
connections are tight, but do not overtighten with exessive use of
spanners etc. If bare wires are used, make sure that no loose strands of
wire short across to the other terminals or the amplifier chassis. When
using plugs such as Banana, be sure to use good quality one`s with a firm
fit.
BALDUR 300 triode power amplifier

INSTALLATION AND OPERATION
MAINS VOLTAGE
CH CK that the mains voltage printed on the rear of this
amplifier is similar to the mains voltage normaly supplied to
your area. If indoupt, please consult your AUDIOVALV dealer.
PLACEMENT AND VENTILATION
This AudioValve Baldur 300 power amplifier is designed to
operate at a moderately high temperature. The ideal location
is on the rigid stand or floor mounted away from direct contact with any
objects, materials or deep pile carpets which may be effected by the heat
or which may interrupt the flow of air around the amplifier.
When operating the amplifiers quite a lot of heat is generated which
should be allowed to dissipate without restriction. Make sure that no
objects are placed on the top of the amplifier. Always ensure adequate
ventilations.
MAINS / LINE POWER connection is via supplied plug-in lead. The
standard I C socket connects the mains power at the amplifier end while a
local mains plug is required at the wall end. In the event where a "local"
plug needs to be fitted to the wall end of the lead, ensure the at the plugs
is wired correctly by a suitable qualified or experienced person.
nsure the main switch of the front of this amplifier is OFF before
attempting any modification of the mains connection.
MAINS / LINE FUSE
A Mains / Line fuse is fitted within the I C Mains / Line socket on the
rear of the amplifier. A small draw at the bottom of this socket may be
removed (after the IEC plug is removed) by levering it out with a flat
blade screw driver. The fuse fitted should be razed at no greater than 10
ampere slow blow.
In the unusual event that this fuse should blow, you must first
establish the cause of this failure, cure the fault and then replace the
fuse with one of the same type.

BALDUR 300 triode power amplifier
DO NOT FIT A FUS WITH HIGH R RATING.
AUTOMATIC BIAS CONTROL FUNCTION ( ABR )
ach from the 10 * 6AS7G ( 6H13C ) power tube is controlled by an ABR
for each system in the tube. The correct function of the ABR is shown by
three L D`s at each side, next to the power tube.
When the amplifier is operating, no L D is shinning.
In case that any of the power tubes is faulty one of the L D`s,
which are at the right and left side of the power tubes ,
immidiatly indicated.
If this happens, you have to change the power tube of this place.
After changing the power tube, the L D must be off again.
If still any of the L D`s is on, please contact your AudioValve
dealer.
Please notice:
Please take notice when switching on the amp , the
STAND BY SWITCH has to be in operate ( rocker switch up) !
All handling at the open amplifier has to be done
when the main power plug is disconnected .
In STAND BY MOD , two of the L D`s of the ABR of each
power tube is shinning.
When the amplifier is driven in a very high level output,
the ABRs are regulating the power tubes and there is a slighty
shinning of the two L Ds together.

BALDUR 300 triode power amplifier
BALDUR 300
SP CIFICATIONS:
· power consumption: 450 VA nominal, - ( for max. output - 1500 VA )
· max output: 300 watt-RMS
· nominal output: min. 200-240 watt sin - 1% distortion at 8 ohm load.
· damping: 25
· bandwide: 3 hz - 45 khz
· s/n ratio: - 64 dbm, (0,5mV)
· gain 28 db
· distortion: 10w - 0,15%; 50w - 0,22%; 100w - 0,3%; 200w - 1%
· fake XLR ( pos. phase only pin 2 ) and RCA inputs
· input resistance: 47k
· 4 & 8 ohm speaker terminals
· weight: 55 kg
· size: 49 * 52 * 43 cm (w*d*h)

BALDUR 300 triode power amplifier
W A R R A N T Y
AUDIOVALV warrants its components for a three-year period on
all electronics and a 90-day period on the tubes from the purchase
date.
In the event of a failure of your amplifier , AUDIOVALV will repair
or readjust this unit or , should the occasion arise , will replace it
provided that all conditions stipulated in this warranty are met.
In order to initiate service of any kind it is necessary to obtain
distributor or dealer authorization prior to shipping the unit for
service.
Any of the following conditions shall void the warranty:
•Operation not in accordance with this manual.
•Abuse , accidental damage or unauthorized modifications , as
determined by AUDIOVALV or its agents exclusively.
•Removal , defacing or falsifying of the serial numbers.
•Shipping without the original complete factory crates.

BALDUR 300 triode power amplifier
WARRANTY REGISTRATION
Please fill out and return this warranty form to the distributor within 15 days of
the purchase date with this form here, or make it online on our webside.
•MOD L : _______________________________________________
•S RIAL NUMB R : _______________________________________
•PURCHAS DAT : ______________________________________
•AUTHORIZ D AUDIOVALV D AL R:
•PURCHAS R`S NAM : ___________________________________
•STR T ADDR SS : ______________________________________
•CITY : __________________________________________________
ZIP / POSTAL COD : _____________________________________

BALDUR 300 triode power amplifier
10 *6AS7G
or 6H13C
ECC 83
12AX7
ECC 82
12AU7
ECC 82
12AU7
6N6P
Ba dur 300 tube p acement
630 mA
3,15 A
main fuse:
10 ampere sb for 117 VAC
6,3 ampere for 230 VAC

BALDUR 300 triode power amplifier
CE Confirmity
Declaration Of Conformity
Manufacturer: AudioValve,
Germany, 34123 KASSEL, Umbachsweg 70,
[e-mail]
Product Name: EKLIPSE
Product Type: Audio Amplifier
Complies with Standards:
LVD: 92/31/EEC, 93/68/EEC, & 73/23/EWG
Safety: EN60065
EMC: EN55013, EN55020, EN55022, EN55103, EN61000-3-2,
& EN61000-3-3
The official Declaration of Conformity for this product is kept on file at:
AudioValve, 34123 Kassel,Umbachsweg 70, Tel. [phone]

BALDUR 300 triode power amplifier
:: AUDIOVALVE – ORIGINAL CERTIFICATE of testing ::
Kunde: Modell: BALDUR 300 Datum: Ser. Nr.
Mechanische Baugruppen Gehäuseaufbau c
lackierte Teile c
gedruckte Blenden c
Pfosten im Winkel c
Prüfer:
Börger c
Markgraf c
Technische Baugruppen ptische Leiterplattenprüfung vor Einbau c
Sitz aller Kabel, zugfest und isoliert c
Prüfer:
Börger c
Markgraf c
•Elektronik Alle Gleichspannungen gemessen c
Signale linker & rechter Kanal c
Geräusche c
Balance (nach rechts-rechts mehr) c
log. Lautstärke c
home theatre c
Eingänge – Ausgänge,Cinch/XLR c
Relais und Empfindlichkeiten c
Fernbedienung c
alle LED vorne c
( siehe separates Protoll für jeweiliges Modell unten )
*nicht zutreffendes streichen
Prüfer:
Börger c
Markgraf c
ptische Endkontrolle Äusserliche Sichtprüfung c
lose Teile c
fehlende Schrauben c
keine Kratzer, Lack & berglas c
Sitz aller Muttern / Schrauben oben / unten c Federleisten, Blenden,
Seiten - fest c
Seriennummer, CE Sticker c
Prüfer:
Börger c
Markgraf c
Meßtechnischer Teil: Soll links rechts
Anode 6AS7G - Anode Treiber 230 VDC - 420 VDC c c
Heizungen alle checken c c
Bias alle Endröhren 420 millivolt DC c c
Kathode Ausgangstreiber 124 V c c
Anode Eingangsröhre links 95 V c c
Signalspannungen Alle Eingänge c c
Geräusche bei kurzschl. RCA c c