Pioneer SX-3800 manual Tront Panelfacilities, SpERrERswtrcHEs, GnlcHrNEss @sELEcroR

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2 . TRONT PANELFACILITIES

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c POWERSWTTCH

Set this switch to ON to supplypowerto the receiver. Therewill be a shortdelaywhenit issetto ON, because the muting circuit has been actuatedto suppressthe unpleasantnoisethat is sometimesgeneratedwhenthe powerisswitchedon andoff .

O spERrERswtrcHEs

Depressthe switch correspondingto the speakerscon- nectedto the SPEAKERSterminals(A or B) on the rear panel .

You can depressboth of thesebuttonsto listento the sound from two pairsof speakerrystemsat the same time .

gnlcHrNEss

@sELEcroR

Use this switch to selectthe brightnessof the power meterandthe frequencydisplav .

BRIGHT: Whenusingthe receiverin daylightor other brightlocations .

D I M : At night or in dark locationswhenthe exist- ingbrightnessistoo high .

CI POWERMETER

This meterallowsyou to readout the ratedpowerlevel on the fluorescentdisplaytube when speakerswith a nominal impedanceof g ohms are connectedto the speakerterminals.

@ orel PoINTER

Thispointerindicatesthe broadcastingstations.

@ bunnrz LocKEDtNDtcAToR

This indicatorlightsup after the optimum tuningpoint hasbeenobtainedanddisplaysthat the receivingstateis stabilizedby thebuilt - inquartzlockcircuit .

O TTUSTEREOINDICATOR

This indicatorlights up when receivingan FM stereo programif the FM mutingoff switchis released.

,o SIGNALINDICATOR

This indicatorlightsin sequencefrom left throughright duringthe tuning of an AM or FM broadcastin accord- ance with the strengthof the signalsbeing received. The optimum tuning point is where the maximum numberof indicatorslight.

@ rururructNDtcAToR

When tuning in an FM station,the optimum reception point is indicatedwhen the centerindicatorlightsup. When the left indicatorhascome on. rotatethe tuning knob slightlyclockwiseWhen.the rightindicatorcomes on, rotatethe knob slightlycounterclockwise-

@ rnEouENCYDTSPLAY

Thisindicatesthe frequencywhichistuned .

With FM reception,the letters,,FM.,appearon the left of the displayand ',MHz,'

on the right .WithAM recep .

tion, "AM" appearson the left and ,,kHz .. the right . on

These changewhen the function selectorposition is changed.

0 rururrucKNOB

Usethis knob to tune in to broadcastingstations.

c} FM MUTTNGOFF SWTTCH

Whenthis switchis releasedand an FM broadcasttuned

in, the mutingcircuit is activatedinsideto suppressthe annoying interstationnoise betweenthe broadcasting

frequenciesfor noise-freereceptionWhen. the broadcast-

ing stationis far away or when receivinga stationin a fringearea,set the switchto the OFF positionandthen

tune in. lf thereis a broadcastingstationwith a strong

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Contents FM Ouartz Locked SixSTEREORECEIVER-gaoo Sefvice nualH H T H H ContentsTo 20000Hertzt02dB Or, iori ,ro i ,ou P E C T F T C a T I O N SFM TunerSection OdBSemiconductors Eix-3El00IMiscellaneous FurnishedPartsSpERrERswtrcHEs Tront PanelfacilitiesGnlcHrNEss @sELEcroR @ bunnrz LocKEDtNDtcAToRGRl-Rr\cE @coNTRoL @ volunnEcoNTRoL1l , or Block Diagram@f--q-*@ LhTjl 68-llCompositesignal Switchins,is.rc-1q/ t h LFig 1 Choppertype switchingcircuit CircuitdescriptionsSx-gaoo G 6 D 1 D 5 t i m e d i v i s i o np u l s es i g n a l s Fig 5 Blockdiagramof PD5009Mode B l e1Fig .4 7 SIGNALindicatordrivecircuit Signal lndicatorCircuitFig 9 Poweramplifier Ble lo those of a small-signaltransistor.Further Excellent high frequency characteristicscomparaMore,becanselhere is no time clonstantin the NFB Circuit ir-rthe lorv-frecluencyregion, amplificationO W E R N D I C a T O RC I R C U I T Fig .4 12 Power indicatorcircuitBecome de-energized,thus causing the ourpur Deenergized, thus causing the output circuit toOverloadDetector Overload detector circuit incorporatesFront panel Bonnet case Bottom plate DisassemblyFront View with PanelRemoved Parts LocattonRearPanel AKE.O54+I t i t TUNERAssy GWE-133Ia.i Rrprro&ffiD16l + +$ll1rl IlIlLiTtFTTTTTTT- - 1 * l l l l t t INDICATORAssy AWV-OO9E0UALIZERAssy AWM-227 I t TiiRtrf TONECONTROLAssy# x r , o E i t t l i 6 YTttt,,.,i%hi*i*U # *n AI I h-l8lr rorAL2oowMAx Lmfii= # . = - r Ol!6 - j,r-l*-,,-s-l?tA tlDzrT 4u- @ *ronce 3lilli Nffi$r-ffir S5fls FfTJ-irTop View BottomViewIFuse64 GWEDial pointer I a L C O R D S T R I N G I N GN i n gd r u m Dialshaft Startingpoint Dialpointer GK 6 AdjustmentsArrrrTl ConnectSIGNALmeteror DC voltmeter MPXsignalgeneratorTo FM300n ANT terminals AC voltmeter Distortionmeter R E Ct e r m i n a lTo AM ANT 1kfl resistor TerminalFis .8 R a n t e n n ac o i l AM signalgeneratorAC voltmeter To RECterminal FJaJtuL6 AFosc,lt ,-d + u tLvR5ll \ ,v\ Te ,t . 1VR2*€ @vnr FL indicatorassemblyFig .8 PD5009AAB.24O ExteriorComponentsVBZ3OPOSOFMC Ro. AEK-rog Interior ComponentsAcN lrs 25 e6228 Ae*-\SX.SClOl Fr-r r ? TH 1 3 Heat Sink BlockUsr Illl\N n n n t AN,,4Sa TunerAssemblyGWEE6nmr NrrezZC65,C66,C70,C71 c63,C64 C303,c304 PrecautionsS3,s4 Arc-o72AWS-146 SwitchAssembly ToneControlAssemblyt G W G 1 4SwitchAssemblyGWS-226 Lynlgt9 9*ie9Nr21, R12z PowerSupplyAssemblyGWR-j22 PowerAmplifierAssemblyGWH-139Ncru-rat 9yqlglt o*lelglSwitchAssemblytGWS-223 FL IndicatorAssemblyAWV-009SpeakersTerminalAssemblytGWS-222 ADH A C K I N GAR8-355 AHD 7s5P E C F I C a T I O N S StereoreceiverFM Ouartz Locked With exceptionof thissupplements$ r u r Contrastof Miscellaneous PartsSrs Rd.*dr q l SCHEMATICDIAGRAM,P.C. Board PatternsandIBi ihl*cr Il,*3 Parts List3il3i!11 Lr-l--.q.iliffiSX-3EtCO/si/GirS RtmlUJl--J 11ffiflAWS-148 €tX-ggtOO/gi/GlrsCl, c2 C3,c4

SX-3800 specifications

The Pioneer SX-3800 is a classic stereo receiver that emerged in the late 1970s, embodying the high-fidelity audio aspirations of its time. As part of Pioneer’s widely respected SX series, the SX-3800 is hailed for its exceptional sound quality, robust construction, and an array of features that cater to both audiophiles and casual listeners alike.

One of the SX-3800's standout characteristics is its power output. It delivers a solid 80 watts per channel into 8 ohms, making it capable of driving a variety of speaker systems with ease. This ensures a dynamic audio experience, with clear highs, rich midrange, and deep bass. The receiver also exhibits low total harmonic distortion (THD) ratings, which means the sound produced is clean and faithful to the original recording.

The SX-3800 is equipped with a high-quality AM/FM tuner, which is known for its excellent sensitivity and selectivity. Featuring a large analog dial, it allows users to effortlessly dial into their favorite stations while the signal strength meter helps in fine-tuning the reception. This tuner is complemented by Pioneer’s proprietary Auto-Seek tuning function, making it easier for users to find and lock onto stations.

In terms of connectivity, the SX-3800 comes with several inputs and outputs, including phono, tape, aux, and multiple speaker outputs, offering flexibility for various audio setups. Additionally, the built-in phono preamp ensures that vinyl lovers can connect their turntables with ease, preserving the rich detail and warmth that analog sources are known for.

Another technological highlight of the SX-3800 is its inclusion of a loudness control feature, which allows users to enhance the low and high frequencies at lower volume levels. This feature is particularly useful for late-night listening or in quieter environments where detail is essential but loudness is not an option.

With its solid construction, vintage aesthetics, and a beautiful wood finish, the Pioneer SX-3800 not only performs well but also adds a classic touch to any audio setup. Its blend of features, performance, and timeless design continues to make it a desirable component in the world of vintage audio equipment. Collectors and enthusiasts appreciate the SX-3800 not just for its sound quality but also for its enduring legacy in the rich history of audio technology.
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