GAS Thaedra - Bass and Treble Controls; Low Filter Function; Mode and Tape Controls

BASSCONTROLS:
Thesecontrolsalterthelow‐
frequencyrespOnseofthetwochannels
below600Hz.Theprecisea!terationscanbeseeninFigure3.:ts
stepped′
discrete‐
resistorconstructioninsuresachannel‐
to‐
channe:
accuracywithinldBthroughoutitsrange,Whenusedinconiunction
uviththelowf‖
ter,awiderangeofcorrectivealterationispossible,
partia‖ ynegatingdeficienciesinspeakersandsourcematerial.
TREBLECONTROLS:
Thesecontrolsalterthehigh―
frequencyresponseofthetwochannels
above1800Hz.TheprecisealterationscanbeseeninFigure3.丁
hey
havethesamestepped′
discrete‐
resistorconstructionastheBASS
contro:s.TheboostpositiOnsincorporatesupersonicf‖ teringina
Gaussianfrequencydistribution.Theresuitantsmoothcurvecausesa
minirnumphasedistortionofhighfrequenciesandprovidesthe!east‐
ObieCtiOnableinterferencefromnoise.
LOWFILTER:
Fourpositionsof!ow‐
frequencyattenuationareprovidedbythis
contro!.Attenuationoccursattherate(slope)Of12dBperoctave
belowthese:ectableturnoverfrequenciesof10,20,30or50Hz.:tis
usefulwhereyourturntableand/orrecOrdhasrunnb!einterference,
Althoughtherumblefrequencymightbebelovvaudib‖
ity,andthus
nothearddirectiv′ itseffectcansometirnesbeheardasintermodu:ation
distortionoccuringineithertheamp!ifierorspeaker.:tsusemight
thusc!eanupthesoundctarityinthemidorhigh=frequencyrange.
Theuseoftheiowfi!terinconiunctiOnwithbassboostextendsthe
f!exib‖
ityoftheavai!ab!ebassconnpensation.
MODESWiTCH:
丁
hisswitchdetermineshov′
thesourceinputsarechanneledtothe
outputiackS.:tfunctionsasfo‖
ows:
A.Theleftchannelisconnectedtobο
よ″outputs.
B.Therightchannelisconnectedtoわ
οオカ
outputs.
A+B........BOthChanne:sarecombinedandthemixed{Mono)
resultantisconnectedtobOιみoutputs.
STEREO..... 丁
his,thenormalposition,connectstheleftinputto
the:eftoutputandtherightinputtotherightoutput.
REV.........・
ThiSpositionconnectsthe:eftinputtotheopposite
(right)outputandtherightinputtotheopposite
(left)Outputisimp!yreversingtheSTEREOmode
descr:bedabove.
TAPEMONITOR:
Thenormalpositionforthiscontro:iseitheroneofthetwolabeled
OUT,WhenatOtJT,thesigna:sselectedbythesourcepush‐
buttons
mavbeheard.Whenyou、vishtomonitoranyofthetaperecorders
connectedtothetapeinputsofTHAEDRA,simp:yturnthecontrol
toeitherofthethreepositionscorrespondingtotheappropriate
recorder.
WhileinthettAPEl′ 丁APE2,orttAPEFRONTposition,thesignal
selectedbythepush― buttonsourceselectorwi‖ bedisconnectedand
thesignalfromtheselectedtaperecorder'soutputwilibesubstituted.
Theorigina‖
yselectedsourcesignalwi!!′
however,continueplaving
intotheTAPEOUTiaCkS.Thus′
byrapidlyswitchingbetweenthe
OUttpositionandthedesiredTAPEsource,thetvvosigna:scanbe
connparedwhi:erecording.Ofcourse,thisdirectmonitoringcanon!y
beachievedwithrecordershavingadequateheadprovislonsforthis
purpose.
TAPECOPY:
Thissvvitchmakespossib:e′
vvithoutresortingtoexterna!′
patchcords″
′
extremelyversat‖ einterconnections(forcOpyingoreditingpurposes)
betⅥ
″eenanyofthethreetaperecordersconnectedtoTHAEDRA.it
functionsasfo‖
ows:
1‐
2....…
…
・
TAPEl力
ρ
″
おareconnectedtoTAPE20″
ゅ
″
な
(ie:Thesignalsfromtaperecorderlarefedoutゎ
taperecorder2.
1‐ F.....
・

・

・

・
TAPElinputsareconnectedtothefront‐
panelTAPE
OUTiaCk,
2‐ 1........
・
TAPE2inputsareconnectedtoTAPEloutputs.
2‐ F.....
・

・

・

・
￢
「
APE2inputsareconnectedtothefront―
panel￢
「APE
OUTiaCk.
F‑1........
・
Thefront‐
pane!
丁APE:NiackiSCOnnectedtothe
TAPEloutputs.
F‐
2.....・
・・

・
Thefront‐
panelTAPEINiackiSCOnnectedtothe
TAPE2outputs.