Audio Valve Avalon User manual

INSTRUCTION
manual
for
AVALON
PPP - MONO POWER AMPLIFIER
_____________________________________
This handcrafted product was special made for your high demands,
to display the music on ist finest way.
We guarantee,that this amplifier was carefully produced
and tested in all details.
_____________________________________________________________________

Congratulations on your decision to become the proud owner of the
AUDIO-VALVE AVALON 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 AVALON
should provide trouble free performance.
Please take time to read this manual
thoroughly before using your amplifier.
List of contents
- Warning and precautions page 3
- Front panel - rear panel page 4
- Drawing front panel page 4 a
- Drawing rear panel page 4 b
- Input - output terminals page 5
- Polarity - phasing page 5
- Installation and operation page 6
- Automatic bias control ( ABR ) page 7
- Specifications page 8

WARNING
This amplifier AVALON operates in class - A and is
therefore capable of generating a moderately high temperatue
which requires carefull 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 referered 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 circut, earth / ground
or appliance (other than suitable HiFi quality loudspeakers )
to any output terminal.
Some preamplifiers, prossesors, 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 and operate the
Stand - by mode of the amplifier before turning on the Challenger.
Note: the AVALON power amplifier do not cause this problem.

FRONTPANEL
The front panel of the AVALON 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 LED immediatly beside the
switch illuminates to indicate that the power is ON.
This amplifier draws o 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 LED is off).
REAR PANEL
The facilities on the rear panel of the AVALON may
seem not so complex. The rear panel incorporates all
of the terminals for connecting the input signals and
the output signals to the loadspeaker. 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 AUDIO VALVE AVALON
power amplifier is a high quality electronic instrument
capable of an exeptioneal level of performance.
Be sure that you understanding your requirements fully
before you make any connection to this amplifier.

INPUT TERMINALS
Input terminals for this AVALON power amplifier are easily
accsessible and fitted to the lower centre area of the rear panel.
RCA INPUT. These standart type of RCA terminals are for
use with unbalanced signals from most signal sources such as
audio preamplifiers.
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 postes for each cannel are supplied.
CONNECT your loudspeaker positive terminal to the
amplifier (+) output terminal. Connect your loudspeaker
negative terminal to the ( - ) output terminal.
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 Audio Valve dealer for advice.
Do not make any other connection to any of the amplifiers
negative or positive output terminals.
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.

RCA
Mainplug
Fuse
8 ohm
4 ohm
+
+
-
-
Speaker

INSTALLATION AND OPERATION
MAINS VOLTAGE
CHECK 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 AUDIO VALVE dealer.
PLACEMENT AND VENTILATION
This Audio Valve AVALON 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 standart IEC 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.
Ensure 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 IEC 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 6.3 ampere slow blow.
In the unusual event that this fuse should blow, you must first
esthablish the cause of this failure, cure the fault and then replace
the fuse with one of the same type.
DO NOT FIT A FUSE WITH HIGHER RATING.

HALF AUTOMATIC BIAS CONTROL FUNCTION
Each power tube is controlled by plate current.
The correct function of the power tubes is shown by 1 LEDs,
next to each power tube.
When the amplifier is operating, no LED is shinning.
In case that any of the power tubes is faulty the LED,
which are together at the 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 LED must be off again.
Please notice:
All handling at the open amplifier has to be done
when the main power plug is disconnected .
When the amplifier is driven in a very high level output,
there is a slighty shinning of the LEDs.

AVALON - SPECIFICATIONS:
prinzip: Parallel-push-pull power amp
tubes: 1*12AU7, 1*12AX7, 8*beam power pentode
for example: EL 84
operate: class - A
power output: 60 Watt
power consumption: 160 Watt - Stand by mode - 30 Watt
max. short circuit
current: 15 ampere between 2 ohm terminals
input sen. 0 dBm (adjustable by resistor trimmer)
input imp. 1 * 47K
output imp: 2-4-8 ohm
connectors: RCA input-jacket
power bandwide: 5-40.000 hz
distortion: 0,3% - 50 Watt (8 ohm load)
damping: 40
bias: half autom. ,with LED shinning by bad power tube
size: 32*220*20 cm, D-H-W
weight: 22 pounds
Stand-by mode: switchable

W A R R A N T Y
AUDIO VALVE 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 , AUDIO VALVE 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
AUDIO VALVE or its agents exclusively.
•Removal , defacing or falsifying of tne serial numbers.
•Shipping without the original complete factory crates.

WARRANTY REGISTRATION
Please fill out and return this warranty form to the US distributor within 15 days of the
purchase date.
•MODEL : _______________________________________________
•SERIAL NUMBER : _______________________________________
•PURCHASE DATE : ______________________________________
•AUTHORIZED AUDIO - VALVE DEALER:
•PURCHASER`S NAME : ___________________________________
•STREET ADDRESS : ______________________________________
•CITY : __________________________________________________
•ZIP / POSTAL CODE : _____________________________________
Send to :

8 pcs. EL 84
12AX712AU7
Pc - board top side
Input sensitivity
Rf - bandwide
Input stage
Driver stage