Warwick Pro Fet II - Testing and Regulating; Basic Configuration; Preamp

UsedMeasuredevices.
Generator:Wavetek
Model188-S-1257
4MHzSweep/FunctionGenerator
Oscilloscop:Goldstar
OscilloscopeOS-7040A40MHz
2.1BasicConfiguration
2.2Preamp
Testing/Regulating
Bild3. :ProTubeIIBasicconfiguration
Testingthefilter
Totestthefilters(LowBoost,Bass,Punch,Mid,
Attack,Treble,HighBoost)atonegeneratoris
connectedtotheinputandthecontrolsofthe
aresettotheirLINEARconfiguration.The
signalismeasuredusinganoscilloscopeatthe
output.
Thefiltertobetestedisfirstturnedallthewaytothe
right(seethe""table)andthenallthewayto
theleft(seethe""table).WhentestingtheMid
filter,youalsohavetosetthecutofffrequency(250,
7k).
Oncethefiltertobetestedhasbeenactivated,thefrequencywiththegreatestdegreeof
amplificationmustbedetermined.Thisisthencomparedw iththedataintheadjacenttable
andshoulddeviatebynomorethan15%.
Pro
FetII
EffectsSend
Boost
Cut
±
InstructionsconcerningtheLimiter,Gain
TotesttheseLEDs,thecontrolsofthemustbeintheirLINEARconfiguration.
TheswitchinglevelsoftheseLEDsaresetoutinthecircuitdiagramforthepreamp.
TotesttheGainandLimiterLED,asinewavesignalofapproximately1kHz,variableinits
amplitude,isappliedtotheinput.
Thesignalismeasuredusinganoscilloscopeatorof.Theinputsignalisthen
increaseduntiltheswitchingpointoftheyellowLEDisreached.Themeasurementtakenat
isthencomparedwiththelevelgiveninthecircuitdiagram.Theinputsignalisthen
increasedstillfurthersothattheOKandClipLEDscanbe testedinthesamemanner.
TotesttheLimiter,firstactivateitandthenproceedinthesamemannerasbefore.
ProFetII
PIN-76IC1
IC1
NOTE: Aneffectiveexaminationofthecanonlybe
carriedoutusingafrequencyanalyser.Thegraphs
neededfortheevaluationbeginonpage18.
ProFetII
ToconductatestonaWarwickwiththe
measuringdatagivenbelow,youmustfirstsetthe
variableparametersinthechannelstripstowhat
willhenceforthbedescribedastheirLINEAR
configuration.
ProFetII
Page5
Gain\Master
Limiter\Mute
LowBoost\HighBoost
Bass\Punch\MidLevel\
Attack\Treble
10
OFF
OFF
0
Input
Vss/mV
Filter
Options
FilterFrequency
f/Hz
BoostCut
(+6) U/Vss (-6)
10
10
10
10
10
10
10
10
30
70
230
250
7,2k
2,1k
6,8k
25k
1,4 /
1,5 92m
1,5
88m
1,8 80m
1,7 80m
1,5
1,6
1,8
96m
/
96m
LowBoost
Bass
Attack
Treble
HighBoost
Punch
MidLevel(250)
MidLevel(7k)