Audionet PAM V2 User manual

Phono-Pre-Amplifier for MC / MM
User's Manual

2
Owner's manual
TheAudionet-Teamwould liketo congratulateyou for purchasing this
excellent phono pre-amplifier.
Pleasereadthis manualbeforefirst useto beawareof all featuresof your
new Audionet PAM V2.
In caseof questions to occur pleasedo not hesitateto contactyour local
Audionet dealer or our factory directly.
Included you will find thefollowing:
§your phono pre-amplifier Audionet ‘PAM V2’
§theowner's manual (you arereading right now)
§onestandard power cord
Pleasetransport your ‘PAM V2’ only insidetheprovidedpackage.Use
theplasticbag to prevent scratches on thehousing.
Included
Transport

3
Overview
TheAudionet‘PAM V2’ is designedin reference to theprinciplesof the
Audionetamplifiertechnology to usetheir advantages. In thefollowing
you will find listed thedesign features of the‘PAM V2’.
Thebaseof theunit is the2mm steelchassis to protectthecircuitry and
electroniccomponents fromhigh frequency electromagneticfields.
Thedeemphasis of themusicsignalpressedinto vinyl is doneby adual-
stageRIAA deemphasis circuit using discretebuilt Audionetoperational
amplifier modules in SMD technique(surface mounted device).
By using thesametechniques of Audionet's reference lineit is possibleto
keepthesignalpaths clearof quality reducing components likecapaci-
tors, switches or integrated operational amplifiers.
The‘PAM V2’ offers userdefinablefeaturesfor adjusting to any pick-up
(MC,MM) without opening theunit.
Furthermore‘PAM V2` is equippedwith biascurrent free FET inputs
thatdo not influence theconnectedpick-up. Thedriverstageof the
‘PAM V2’ is built in CLASS-A techniqueand thanks to theservo cir-
cuits has DC voltagefree outputs.
Thecompletedesign makesuseof highest quality components (mica
capacitors in thefeedbackloop, miniaturerelays with gold platedcon-
tacts, metallayerresistors with low temperaturecoefficient and 1% pre-
cision etc.).
Thebuilt in protection circuit will quickly cut off theoutput signalin any
caseof mains failureto prevent any noisegetting to theloudspeakers.

4
Setup
Your newphono preamplifier‘PAM V2’ should find its adequateplace
onto ahigh quality rackor stablefurniture.Pleasedo not put the
‘PAM V2’ directly sideby sideto aloudspeakeror into thecornerof the
roomasthereis to befound thehighest acousticalenergy. Also avoid
proximity of power amplifiers and mains filters.
Pleaseplug thepowercord into themains socketatthebackof theunit.
Connecttheotherend of thepowercord to your wall outlet. The"hot"
pin of thepowercord should beconnectedto theright pin (rearview) of
‘PAM V2's’ mains socket.
Thepowersupply of your ‘PAM V2’ is equippedwith apottedand
shielded100 VA toroidaltransformerand 40.000 mFelectrolytecapaic-
tors.
Two fast MOSvoltageregulators cleanup thesecondary voltages. After
thatthemain voltagesarecontrolledby eight fast and discreteMOSvolt-
ageregulators with accumulator-likecharacteristics. This providesa
separatepower supply of highest precision for each section.
You havetheopportunity to purchaseanexternalpowersupply for your
‘PAM V2’. This powersupply unit, called‘EPS’(Enhanced Power Sup-
ply), is to beconnectedto the‘ext. Power’ socketatthebackof your
‘PAM V2’ with thespecialcord providedwith the‘EPS’. You will then
haveto unplug thepower cord fromyour ‘PAM V2’.
Spatialseparation betweenpowersupply and ‘PAM V2’ circuits less
influence on all components by thepowersupply will begained. The
‘EPS’should beplacedatmaximumdistance to the‘PAM V2’ to obtain
moremusical substance.
Placing
Mains
Powersupply
External powersupply‘EPS’

5
Connections
At therearthereis apair of WBT cinchsockets (stereo) for connecting
theturn tableaswell astheinputs labeledC/Rext for additionalresistors
or capacitors to adjust to theelectricalcharacteristicsof thepick-up.
Basecapacity of the‘PAM V2’ is 150pF.Thegold platedscrew(GND)
is for connecting theturn tableground.
At therearyou will also find theoutputs. You canuseeitherbalanced
out (XLR, Neutrik sockets) or lineout (WBT, cinchsockets) to connect
your ‘PAM V2’ to your pre- or main-amplifier.
Inputs
Outputs

6
Operating
At thefront platethereis thepowerbutton to switchon and off the
‘PAM V2’. Using theknob attheright of thefront platelabeled‘GAIN’
you select thegain to 38dB, 48dB, 58dB or 68dB (deziBel).
Theselected gain is indicated by theLEDs in themiddleof thefront.
Most MM pick-ups (moving magnet) needagain of 38dB, whileMC
systems(moving coil) usually requiregains of 58dB or 68dB. Also avail-
able‘high output MC’ systemsmostly will work properly with 48dB
gain. Pleasetry out individual setting for your pick-up.
Aknob labeled‘input imp.’ is to befound atthebackof the‘PAM V2’
for selecting theterminating resistance to your pick-up. Pleaseselect
carefully. It will effecthigh frequencyresponse.Using MM systemsse-
lectimp.=47kW.MC systemsmayneedresistance ranging from
imp.=100Wto 1kW.
In caseof any otherresistance or capacitance neededby your pick-up
pleasereferto page8 for furtherinstructions how to setup theappropri-
atevalues using thesockets labeled C/Rext.
Theactivestructureof your ‘PAM V2’ is equippedwith two DC voltage
servos thatbuild up aninternalsecond ordersubsonicfilterwith acut off
frequencyof 10Hz.This will protectthewooferfromunnecessary stress
or damagedueto subsonicfrequenciescausedby wavy vinyls or outer
noise.
Nowadays interestedlisteners experiencedtonaldifferencesin using dif-
ferent powercords. In orderto increasethevalueof your ‘ART’ you
havetheopportunity to usehigh performance power cords.
It is advisableto protectand decoupleyour ‘PAM V2’ formouternoise
astheunit will amplify afrequencyof 20 Hzby afactor of e.g. 20,000
with gain selected to 68dB!
Subsonicfilter
Tuning

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Furtheradjustments
In caseof insufficient basecapacity of C0=150pF(picofarads) anaddi-
tionalhigh quality miniaturecapacitor Cext canbeconnectedto theinput
labeled C/Rext using acinchplug to increaseinput capacity. Both capaci-
ties will beadded simply.
Basecapacity C
0
=150pF;neededcapacity e.g. C=350pF,therefore
Cext= 200pFhas to beattached.
In caseof theneededresistance lowerthan100W(positions 6o'clockat
the‘input imp.’ switch) anadditionalhigh quality miniatureresistor Rext
canbeconnectedto theinput C/Rext using acinchplug to reduce thein-
put resistance.Attention! Thereciprocalvaluesof theresistors areadded,
so theinput resistance is reduced!
Neededis aninput resistance R=33W;thebaseresistance R
0
=input
imp. is selectedto R0=100W,thereforetheexternalresistor Rext =50W
has to beattached, becauseof:
0
0
0
11
1
*
RR
R
RR
RR
Rext
ext
ext
-
=Þ
+
=
Neededis aninput resistance R=200W;thebaseresistance R
0
=input
imp. is selectedto R0=330Wt, thereforetheexternalresistor Rext =510W
has to beattached.
Adjusting capacity
Example
Reduce resistance
Example1
Example2

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Technical Data
Type User adjustable phono deemphasis pre amplifier
Frequency response
Subsonic filter
Gain
Input impedance
Noise
Output impedance
15 - 30.000 Hz (+ / - 0,1 dB)
2. order high pass; f
cut off = 10 Hz
38 dB, 48 dB, 58 dB, 68 dB (for 1 kHz) selectable at the front
47 kOhm, 1 kOhm, 500 Ohm, 330 Ohm, 150 Ohm, 130 Ohm,
115 Ohm, 100 Ohm selectable at the rear
>76 dB (58 dB gain)
22 Ohm real
Inputs Cinch sockets (gold plated WBT)
Cinch sockets (gold plated WBT) for external adjustment with cinch
plug
Outputs Cinch sockets (gold plated WBT)
XLR balanced (gold plated Neutrik)
Mains
Power consumption
230 V, 50 Hz
30 W
Dimensions
Weight
430 mm * 70 mm * 310 mm (w * h * d)
9 kg
Finish Front: brushed Aluminum, black elox, print: white
Top: steel, black
Chassis: steel, black
Features - individual adjustment to any pick-up without opening
- active dual stage RIAA deemphasis
- no integrated operational amplifiers or capacities in signal path
- 10 fast, purely discrete realized MOS voltage regulators pro-
viding accumulator-like characteristics of power supply
- 100 VA toroidal transformer, shielded, 40.000mF capacity
- Class A output stage
- DC-free outputs
- FET inputs, no bias current
Errors and omissions excepted. Specifications and
design are subject to changes without prior notice.
audionet GmbH
Brundbütteler Damm 140 B
13581 Berlin, Germany
www.audionet.de
[e-mail]