Pioneer SA-7500 Manual

FEATURES

Power Amplifier
The SA-7500 employs high reliability NPN & PNP silicon power transistors. Together with the differential first stage, all stages are direct coupled in a pure complementary OCL circuit configuration. Careful circuit design and selection of components results in a wide output bandwidth.

Precision Tone Control Functions
Conventional BASS and TREBLE controls are each provided with TURN OVER switches for selecting the frequencies at which the controls take effect. A convenient TONE switch is also included which permits a flat frequency response to be obtained regardless of the tone control settings. This greatly simplifies composing or checking the sound according to cartridge, speakers and room characteristics.

Close RIAA Equalization
RIAA deviation, which governs record playback fidelity, is reduced to very close tolerance by stringently selected equalizer elements. A dual DC power supply system is also employed to provide increased acceptable input volume, resulting in expanded dynamic range and faithful record performance at low distortion.

Protection Circuit
Electronic circuitry and a relay are combined in a fast action protection circuit which guards transistors and speakers from damage in the event of defective connections, such as speaker terminal shorting. When DC current appears in the output, the output circuit is instantly opened. The protection circuit also performs a muting function when the power switch is operated.

Program Sources which can be Enjoyed
Stereo input jacks are provided on the rear panel for two turntables, two tape decks, a tuner, an auxiliary program source plus a microphone, allowing for great flexibility in operation,

Easy Tape Duplication
By connecting two tape decks, the desired programs only can be edited from a recorded tape. The convenient DUPLICATE switch also allows duplication from open reel to cassette tape formats.

Elegant Styling Complements Performance
The front panel of this new Pioneer stereo amplifier has been designed to combine ease of operation with handsome appearance.

STEREO SYSTEM SET-UP

• Do not place equipment in locations that are unlevel or subject to vibration.
• Allow for good rear panel ventilation of components; avoid humidity and dust.
• Keep equipment away from radiators or other heat sources.

SA-7500 APPLICATION EXAMPLE

CONNECTION DIAGRAM

CONNECTIONS

SPEAKER SYSTEM

The SA-7500 is provided with 2 sets of speaker output terminals, A and B. A pair of speakers should normally be connected to the A terminals.

• As shown in Fig. 1, connect the right channel (as viewed from the front) speaker to the R terminals, and the left channel speaker to the L terminals.
• Observe plus (+: red) and minus ( —: black) polarities of the output terminals and those of the speakers. When making connections take care to connect + to + and — to — between the speakers and the SA-7500 speaker terminals.

NOTE:
If 2 sets of speaker systems (A & B) are to be used simultaneously, be sure that all speakers systems are 80 or more in impedance. Damage may be caused of if speakers of less than 80 are employed.

TURNTABLE

Connect turntable outputs to the PHONO 1 jacks, and ground wire to the GND terminal.

NOTES:

1. A moving magnet (MM) type cartridge can be directly connected; however, a low output moving coil (MC) cartridge requires an accessory matching transformer or head amplifier.
2. A second turntable can be connected to the PHONO 2 jacks.
   

TUNER

Connect an AM/FM stereo tuner to the TUNER jacks.

AUX TERMINALS

These jacks are for auxiliary inputs. They can be used to connect a cartridge tape player deck, second tuner, or other source.

TAPE DECK (OPEN REEL OR CASSETTE)

The SA-7500 is provided with 2 sets of recording (TAPE 1 & 2 REC) and playback (TAPE 1 & 2 PB) jacks plus a DIN type recording/playback connector (TAPE 2 REC/PB). Connect as follows:

Recording Connections
Connect tape deck recording terminals (LINE INPUT) with the TAPE 1 REC jacks.

Playback Connections
Connect the tape deck playback terminals (LINE OUTPUT) with the TAPE PB jacks.

NOTE:

1. Connect a second tape deck to the TAPE 2 (REC & PB) jacks.
2. Employ connecting cords supplied with tape deck.
   

Connection Via TAPE 2 REC/PB Connector
Instead of the recording and playback connection just described, the tape deck can be connected to the TAPE 2 REC/PB connector (DIN type) of the SA-7500 provided an identical connector is fitted to the tape deck. The single DIN-cable completes all playback and recording connections at the same time.

Note that the TAPE 2 REC/PB connector corresponds to TAPE 2 PB and TAPE 2 REC jacks — the signal must be controlled by means of the TAPE MONITOR switch on the SA-7500.

FRONT PANEL FACILITIES

BEFORE OPERATION

OPERATION

PLAYING RECORDS

1. Set the FUNCTION switch to PHONO 1 if the turntable is connected to the PHONO 1 jacks, and to MIC/PHONO 2 if it is connected to the PHONO 2 jacks. Note, however, that the turntable connected to the PHONO 2 jacks cannot be used if the microphone is plugged into the MIC jack.
2. Play record on turntable.
3. Adjust the VOLUME, BASS and TREBLE controls for desired volume and tone.

Notes

• Lower the tonearm gently onto the record. Temporarily setting the MUTING switch to —20dB will reduce noise incurred at this time.
• Do not turn off the power while the stylus is in contact with the record.
• Avoid imparting vibration to the turntable while a record is being played. This may cause the stylus to jump and possibly damage the record.
• Howling may be caused if the turntable is too close to the speaker systems. Allow for adequate spacing when installing.

EMPLOYING TUNER (AM or FM Reception)

1. Set the FUNCTION switch to TUNER.
2. Tune in desired station on tuner.
3. Adjust VOLUME, BASS & TREBLE controls for desired volume and tone.

EMPLOYING AUX COMPONENTS

Auxiliary program sources, such as a cartridge tape player deck, can be connected to the AUX jacks.

1. Set the FUNCTION switch to AUX.
2. Operate the program source.
3. Adjust the VOLUME, BASS & TREBLE controls for desired volume and tone.

USING THE MICROPHONE

1. Connect the microphone to the MIC jack on the rear panel.
2. Set the FUNCTION switch to MIC/PHONO 2.
3. Adjust the sound level by turning the VOLUME control gradually to the right.

NOTES:

• You should use a high impedance (above 20kΩ) dynamic type microphone with a standard 6mm diameter phone plug. Pioneer markets a wide variety of high performance microphones for your selection.
• Under certain conditions, a microphone gives rise to howling or feedback noise. Take care not to raise the volume too high when the microphone is close to the speaker system, or in a room with a great deal of resonance. The microphone will perform most effectively with TREBLE and BASS controls at their midway positions.
• While using the microphone, only microphone sound will be heard through the left and right speakers.

Protection Circuit

• After turning on the power of the SA-7500, 3 8 seconds will elapse before sound is obtained from the speakers. This is due to the operation of the built-in protection and muting circuit. It serves to both prevent switching noise when the power is turned on or off, and to protect the speakers in event DC occurs in the output.
• Operation of the internal relay during playing will cause a continuous clicking noise.
  This would most likely be caused by speaker terminal shorting or overload (speaker impedance less than 40). The protection circuit functions automatically in this type of case to disconnect the speaker terminals and safeguard the transistors and speakers. The circuit is selfresetting and after the cause of the trouble has been corrected, it will return to the normal condition.

SELECTING STEREO COMPONENTS

The SA-7500 forms the nucleus of a high performance stereophonic system. One of its primary advantages is that it allows the user to compose, modify and upgrade his system at any time according to personal preference and budget limitations. Pioneer manufactures a full line of top performance components which are compatible with the SA-7500. They are recommended for obtaining maximum value from your system investment,

Turntable
Main factors in selecting a turntable include wow & flutter, SIN, frequency response and ease of operation. Take the time to choose carefully.

Tuner
A good stereo tuner often forms the principal listening source in terms of time. Among the specifications to be considered are stability, selectivity, S/N, separation, and image rejection.

Tape Deck
Special care is recommended in selecting a tape deck since both electronic and mechanical excellence are required. Wow & flutter, SIN, recording & playback response, and operational ease are among the important considerations.

Speaker System
Both left and right channel speaker systems should be of the same brand and model. Output sound pressure, frequency response, crossover response, directionality and impedance are listed among the specifications encountered. Impedance of 4 ~ 16Ω is recommended for use with the SA-7500. However, if 2 sets of speaker systems (A & B) are contemplated, choose from among 8 or 16 ohm systems only.

The very broad range of composition and styles provides great latitude for selecting speaker systems. If space is limited, a compact bookshelf system can be considered, while full size floor standing models often appeal to those with less restricted listening rooms. Your Pioneer dealer will be glad to assist you in choosing the proper speaker system for your particular taste and listening room.

EMPLOYING TAPE DECK

TAPE PLAYBACK

Tape playback: Playback signal enters TAPE 1 (or 2) PB jacks, passes through TAPE MONITOR switch 1 (or 2) and is heard from the speakers.
Fig. 6

1. Set the TAPE MONITOR switch to 1 if the tape deck is connected to the TAPE 1 jacks, and to 2 if it is connected to the TAPE 2 jacks.
2. Play tape on tape deck.
3. Adjust VOLUME, BASS & TREBLE controls for desired volume and tone.

NOTES:

1. Be sure to set the TAPE MONITOR switch to SOURCE when not playing tape.
2. FUNCTION switch setting is irrelevant when playing tape.

TAPE RECORDING

Tape recording: The input signal selected by the FUNCTION switch is always present at a fixed level at the TAPE 1 & 2 REC jacks. Monitoring can be performed at this time by setting the TAPE MONITOR switch to 1 or 2, according to the TAPE jacks being used for recording.
Fig. 7

1. Set FUNCTION switch to the source to be recorded (PHONO, TUNER, etc.).
2. Operate program source.
3. Adjust recording levels with the controls of the tape deck and proceed with recording.

NOTE:
Set DUPLICATE switch to OFF during recording.

Monitoring Recording Conditions
If the tape deck is a 3-head type recording conditions can be monitored through the speakers by setting thé TAPE MONITOR switch to 1 (or 2). Both recording and playback connections must be made in this case.

TAPE DUPLICATION & EDITING

By employing 2 tape decks, the desired material from a previously recorded tape can be edited onto a second tape. A personal tape library can be compiled in this manner.

Duplication: Playback signal from tape deck 1 in the figure enters via TAPE 1 PB jacks, passes through DUPLICATE switch ON, and is recorded by tape deck 2. This can also be performed in reverse, i.e: playback with tape deck 2 and record with tape deck 1.
Fig. 8

1. Connect 2 tape decks as shown in Fig. 8.
2. Set the TAPE DUPLICATE switch to ON.
3. On one tape deck. (1 or 2) playback the prerecorded tape, and perform recording with the other deck.

• The recording can be monitored during duplication. Set the TAPE MONITOR switch to 1 (or2) according to the deck being used for recording 1 (or 2).

EMPLOYING PRE OUT & POWER IN JACKS

INDEPENDENT PREAMPLIFIER FUNCTION
The preamplifier section of the SA-7500 can be used independently to drive an external power amplifier. This allows comparison listening between the SA-7500 built-in power amplifier and a homebuilt or other separate type power amplifier.

INDEPENDENT AMPLIFIER FUNCTION
An external preamplifier can also be connected to the SA-7500 power amplifier section to compose a stereo system.

MULTIAMPLIFIER SYSTEM COMPOSITION
A multiamplifier stereophonic system can be composed by employing a separately sold power amplifier and crossover network. This type of system divides the audible frequency spectrum into sections and amplifies each section via its own amplifier. Significant improvement in such factors as intermodulation distortion forms a major advantage of these systems.

Example of a 2.way Multiamplifier System Composition

SPECIFICATIONS

CONDITIONS FREQUENTLY MISTAKEN FOR MALFUNCTION

If you think that there is a defect, please check the following steps.
If this does not help, please inform your Pioneer Authorized Service Center, giving product name and symptoms.