Peavey Mark III Series Musician User's Manual
Contents
1. EFFECTS gt Esa STEREO PLUG IN OUT wi is 4 PHASOR ASSIGN LINE OUT sw IN OUT Z Z GRAPHIC COMPENSATION Het mea mas nse OUT BUFFER AMP rf POWER AMP hee L n i REV REV i rae DRIVE RETURN ro REV ASSIGN di gt cf Nour uy UNIT REV POST GAIN 8 Pd POWER AMP gt fs Lf 4 OHM C 8 OHM OUTPUT L TRANSFORMER MUSICIAN BLOCK DIAGRAM EXPOSURE TO EXTREMELY HIGH NOISE LEVELS MAY CAUSE A PERMANENT HEARING Li DANGER NEARLY EVERYONE WILL LOSE SOME HEARING IF EXPOSED TO SUFFICIENTLY INTENSE NOISE FOR A SUFFICIENT TIME THE U S GOVERNMENT S OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION OSHA HAS SPECIFIED THE FOLLOWING PERMISSIBLE NOISE LEVEL EXPOSURES SOUND LEVEL dBA SLOW RESPONSE DURATION PER DAY IN HOURS ER HAS BEEN DESIGNED ASIONAL PEAK POWER 2 Oe F All safety and operating instructions should be retained for future reference Obey all cautions in the operating instructions and on the back of the unit A All operating instructions should be followed This product should not be used near water i e a bathtub sink swimming pool wet basement etc This product shouid be located so that its position does not interfere with its proper ventilation It should not be placed flat against a wall or placed in a built in enclosure that will impede the flow of cooling air This product should not be placed near a source of heatsuch as a stove heater radiator or another heat producing amplifier 1980 PRI2. OR TO THE SECOND CLICK PROPER INSERTION OF THE INSTRUMENT S INPUT PLUG WILL BE INDICATED BY ILLUMINATION OF EITHER OR BOTH AUTOMIX LED ACTIVE CHANNEL INDICATORS AUTOMIX JACK 3 The AUTOMIX circuitry was pioneered by Peavey several years ago in order to enable the use of both channels of the amplifier It has been common to play through one channel only while the other channel was not used Our AUTOMIX circuitry enables the player to utilize the full capability of this amplifier by allowing either or both channels to be used during a performance The switching function is controlled by the remote footswitch which is supplied as standard equipment with the amplifier The AUTOMIX effect is activated when your input plug is fully inserted into the AUTOMIX jack and is accompanied by illumination of one or both LED s Our improved circuitry has provided post gain controls for both channels which are actually master volume controls for the respective channels enabling sensitivity and dynamics to be independently adjusted in each channel with the selection of either or both channels accomplished by the AUTOMIX circuitry and its remote footswitch The remote footswitch features a Selector button which enables alternate selection of either Channel A or Channel B The Combiner button operates to mix the two channels together and defeats the Selector button Obviously when the Combiner button is activated both channels are in the ci
3. instrument is touched and this is the position that should be used On export models we utilize a simple on off switch that does not have multiple ON positions since the grounding earthing conditions vary with the different electrical systems of the United States versus other nations LINE CORD 25 For your safety we have incorporated a three wire line mains cable with proper grounding facilities It is not advisable to remove the ground pin under any circumstances If itis necessary to use the amp without proper grounding facilities suitable grounding adaptors should be used Much less noise and greatly reduced shock hazard exists when the unit is operated with the proper grounded receptacles SPEAKER OUTPUTS 26 The speaker outputs utilize standard phone jacks and we have provided both 8 Ohm and 4 Ohm taps from the output transformer to enable this amplifier to be used with an extremely wide range of speaker systems In addition deliberate mismatching of impedances together with a built in damping factor reduction will produce overload characteristics and tonal color exactly matching that of a tube amplifier Experimentation with various speaker combinations together with impedance selection will achieve the desired sound One should be aware that a higher than 8 Ohm load will result in somewhat less power Operating this unit from the 8 Ohm tap into 4 Ohms or from the 4 Ohm tap into 2 Ohms is acceptable if proper ventilation is pro
4. of musical instrument amplifiers have ignored a very basic fact generally poor frequency response from the musical instrument amplifier s speaker system Most amp manufacturers have compensated for the speaker s poor top end frequency response by building in some degree of high frequency boost in order to satisfy the player While this built in high frequency boost is indeed good for improving the response from the system it tends to cause excessive residual noise as well as strident or screechy tonality in the direct preamp output signal Our line output has a built in compensation circuit that very closely matches the rolloff characteristic of a speaker system in order to produce an output signal that corresponds very closely to what s being heard from the speaker system There is also a rolloff of the extreme low frequencies to avoid overload of the associated console by the sub bass signals This very important feature should prove very helpful in eliminating the need for direct boxes and miking of musical instrument amplifiers The signal from the line output jack is a low impedance 600 Ohms unbalanced at a signal level of 2 Volts RMS OUT IN CHANNEL A 16 OUT IN CHANNEL B 17 The out in channel jacks are stereo type ring tip and sleeve with internal switching capability The output of each channelis available at the tip the return input is available at the ring and of course the sleeve or frame is ground An internal swit
5. very effective six band active EQ circuit Each band has been carefully selected for the proper frequency points combining characteristics and precise bandwidth Q to most effectively handle the spectrum covered by the guitar This sophisticated equalization system has been created using the latest computer aided design techniques and has resulted in a circuit that is not only exceptional in performance but provides remarkable consistency across its frequency range This equalizer is capable of a 30 dB range i e 15 dB boost or 15 dB cut in each of the six bands Each channel of the Musician has an assign switch 14 that allows the signal from the respective preamps to be sent either directly to the power amplifier or through the graphic When this assign switch is in the up or in position its signal is routed through the graphic and when it s inthe down or out positions that channel s signal is routed directly to the power amp The action of a graphic equalizer is generally well understood but several precautions should be taken to avoid overboosting the frequency extremes and thus creating difficulties The graphic equalizer follows the channel equalization which is of substantial effect by itself and when combined with the boost capability of the graphic the range of boost becomes tremendous When running the individual channel low mid or high boost near full clockwise positions one should generally avoid overboosti
6. Merk lll Senes MUSICIAN OPERATING GUIDE USICIAN GENERAL DESCRIPTION The new Peavey Mark III Musician represents the fourth generation of this series which has proven to be one of the most popular ever introduced to the musical market The Mark III Series brings our many years of manufacturing and playing experience together in a totally redesigned electronics chassis and package Much engineering time has been devoted to all the minute details that combine to create an effective instrument amplifier capable of producing the various dynamics harmonics and tonal textures so vital in contemporary music Particular care has been exercised in the design of our preamp and equalization circuitry The Musician preamp features Peavey s exclusive pre and post gain controls enabling total control over the dynamics and gain of each input preamplifier The pre gain control functions as the normal gain control while the post gain control operates as individual master controls for each channel This feature is tremendously important when using the Musician in the AUTOMIX mode The relatively weak guitar pickups of ten years ago have given way to the new generation pickups that feature extremely high output and require absolute maximum performance from the amplifier s signal processing circuitry Our efforts to satisfy the demand for the proper texture and overload characteristics have made it necessary for Peavey to completely and totally redesign
7. NTED IN U S A 80344001 ERE Never break off the ground pin on the power supply cord For more information on grounding write for our free booklet Shock Hazard and Grounding Power supply cords should always be handled carefully Never walk or place equipment on power supply cords Periodically check cords for cuts or signs of stress especially at the plug and the point where the cord exits the unit The power supply cord should be unplugged when the unitis to be unused for long periods of time Metal parts can be cleaned with a damp rag The vinyl covering used on some units can be cleaned witha damp rag or an ammonia based household cleaner if necessary OSS INDIVIDUALS VARY CONSIDERABLY iN SUSCEPTIBILITY TO NOISE INDUCED HEARING LOSS BUT SA oH i 4 Higivids are the unit thr dhthe ventilation hors or any other openings This unit should be checked by a qualified service technician if A The power supply cord or plug has been damaged B Anything has fallen or been spitied into the unit C The unit does not operate correctly r D The unit has been dropped or the enclosure damaged The user shouid not attempt to service this equipment All service work should be done by a qualified service technician PEAVEY ELECTRONICS CORPORATION 711 A St Meridian MS 39301
8. ching function provides the norma feed through signal for each channel If an individual preamp output is required a standard tip and sleeve guitar type patch cable can be inserted into the out in jack of the channel desired This will automatically disconnect the channel from the remaining circuitry graphic if in reverb power amp This output can now be patched to an external power amplifier speaker system and together with the internal power amp speaker system a complete stereo guitar system is achieved Interesting effects can be accomplished using the AUTOMIX functions Since the AUTOMIX switching takes place in each preamp either channel of this stereo arrangement can be switched off remotely provided the AUTOMIX circuitry is activated by a blank 14 plug inserted into the AUTOMIX jack In addition if a standard guitar is patched into the AUTOMIX jack output can be remotely directed to either system or both In line patching of effects units can be achieved by using a special stereo patch cord consisting of two single conductor shielded cables connected to a stereo plug One cable is connected from the tip and the sleeve and should be patched to the effects unit s input The other cable is connected from the ring and the sleeve and should be patched to the effects unit s output This in line patching capability can be eliminated anytime by simply removing the stereo plug Details of this special stereo patch are included i
9. ifier s passband that produces very characteristic sounds Many phasor circuits have been offered as an integral part of musical instrument amplifiers We have designed a unique phasing system into the Musician This phasor is capable of producing an extremely wide range of phasing effects including tremolo vibrato effects When used with a touch of reverbration it can closely approximate other popular sound effects such as those produced by rotating speakers etc We have designed an extremely wide range oscillator circuit that is capable of very slow rates as well as progressing to high rates closely associated with tremolo as well as rates produced by rotating speakers We have also built in a range of effects that vary from a very distinct swooshing phase to a very mild and subtle variation Experimentation will show the extreme versatility of this built in phase circuit COLOR CONTROL 11 The phase color control is the element that determines the amount of internal feedback that sets the level of the phasing effect In the counterclockwise position very subtle changes may be heard while extremely deep phasing effects with the accompanying characteristic swooshing sounds are obtained at the extreme clockwise setting Because of the unique action of this control some degree of regeneration is introduced into the circuit in the extreme clockwise 8 9 10 positions and you will note the most effect in the last quarter
10. n the Musician block diagram PILOT LED 21 The pilot LED indicates when the electrical supply is switched on and is actually delivering power to the amplifier AUTOMIX REMOTE SWITCH SOCKET 22 The remote switch socketis the standard DIN type and serves as the amp connection for the supplied remote footswitch Please note that the DIN plug has an indentation that must be mated with the matching indentation in the footswitch receptacle on the front panel This keying action allows the footswitch to be connected only in the proper manner If the plug is forced or undue pressure is exerted on the shell or pins damage could result to the footswitch plug or the chassis mounted socket As with any precision device reasonable care should be exercised REAR PANEL U The fuse is located within the cap of the fuseholder and must be replaced with one of the proper type and value if it should fail It is necessary that the proper type and value fuse be used in order to avoid damage to the equipment and to prevent voiding the warranty If your unit repeatedly blows fuses it should be taken to a qualified service center for repair POWER SWITCH 24 On domestic units the power switch is of the three position type with the center position being OFF This switch has two ON positions one of which is used to ground the amplifier properly One of the ON positions will yield the lowest amount of residual hum or popping when the
11. ng that particular range again in the graphic This double EQ capability enables a fantastic amount of cut or boost but must be used wisely to avoid creating a boomy or muffled sound when too much low end is boosted as well as creating strident screechy or noisy operation when too much high end is boosted One should also be aware that the double equalization available also may cause problems in the extreme cut positions since Cutting the EQ is the equivalent of reducing the gain for the affected frequency range Experimentation will quickly illustrate the effectiveness of these equalization controls and generally no difficulty whatsoever should be encountered PATCH PANEL A full patch panel has been included to enable patching effects devices in line and also to provide a frequency compensated low impedance output to drive recording or P A consoles directly without need of a direct box or other amp mixer interface device The Musician also features separate out in jacks from each channel thereby providing the capability for stereo operation or additional in line patching capability in each channel j PREAMP OUT 18 POWER AMP IN 20 To allow in line patching of the various accessories we have included a system of preamp out power amp in jacks on the front panel The preamp out is the straight preamp signal which is the sum of the outputs of the two channels plus reverb The output le
12. of the most sophisticated musical instrument amplifiers ever made and represents what we feel is a quantum jump in musical instrument amplifier technology Experimentation with the many features of this new unit and comparison with other units will illustrate the many advantages of this new Mark III Series amplifier WARNING To prevent electrical shock or fire hazard do not expose this appliance to rain or moisture OO OOOOMMOQ M i O Q a FRONT PANEL INPUT JACKS 1 AND 2 The Musician features both a high gain 1 and a low gain 2 6 dB input to enable it to accept signals of varying levels and also to facilitate using two instruments into either channel The high gain 1 input is the one normally used Ifthe output signal from your instrument or its associated electronics is overloading the high gain 1 input then the low gain 2 input should be used Because of the unique switching circuitry 1 and 2 inputs automatically are gain balanced when two instruments are inserted into both 1 and 2 The Musician AUTOMIX function has been recently redesigned around the latest in analog switching circuitry and includes LED activity indicators to indicate the channels in use PLEASE NOTE LED S ARE INACTIVE UNTIL AN INSTRUMENT IS PLUGGED INTO THE AUTOMIX JACK NOTE THE AUTOMIX JACK IS A SPECIAL SWITCHING JACK THAT HAS A DOUBLE DETENT I E TWO POSITIONS TO ACHIEVE PROPER OPERATION THE INPUT PLUG MUST BE INSERTED ALL THE WAY
13. rb spring The signal return is amplified and remixed with the clear signals of both channels and is applied to the power amplifier which drives the loudspeaker The reverb control determines the amount of gain in the reverb return amplifier Because of the extremely strong reverb drive system you will find that adequate reverb can be obtained at relatively low settings We have provided significantly more pickup reverb gain in order to enable deep reverb effects that might be desirable from time to time especially when using the reverb for coloration and enhancement of the phase effect Very interesting combinations can be found by using varying degrees of reverb when the phase circuit is operational When the external footswitch is plugged in the reverb return signal can be turned off or on by the reverb switch GRAPHIC EQ ASSIGN SWITCH 14 The graphic EQ assign switch on each channel allows pre programming either or both channels to either go through or to bypass the graphic equalizer This switching assign capability allows the operator to run one channel through the graphic while bypassing the other or to run both channels into or around the graphic This assign capability takes on even greater importance when utilizing the AUTOMIX function since a tremendous range of variation can be obtained between the channels when one channel is bypassing the graphic while the other is fed into it GRAPHIC EQUALIZER 15 The Musician amp features a
14. rcuit as indicated by their LED indicators When in the combined mode the Selector button is inoperative since the combined mode must functionally override the select mode to operate both channels simultaneously To reactivate the select mode depress the Combiner button once PRE GAIN 4 The pre gain controls determine the amount of gain produced in the input preamp Please understand that this control determines the sensitivity and not the power output of the amplifier The control settings in no way can be related to the power the amp is delivering to the speakers because of a number of other factors such as the input signal amplitude setting of the post gain controls etc EQUALIZATION The equalization circuitry of the Musician is extremely versatile as well as reasonably simple to operate Channel A features the latest active circuitry while Channel B is designed around somewhat conventional passive circuitry Some knowledge and operating experience is necessary to obtain maximum benefit from this versatile feature CHANNEL A EQUALIZATION LOW ACTIVE EQUALIZATION CONTROL 5 The low equalization control is of the active shelving type capable of producing either a boost or a cut of the low frequencies Vertical straight up or 12 00 o clock settings produce a flat response while counterclockwise settings produce a cut and clockwise settings produce a boost It should be noted that because this circuit is active significant amoun
15. the electronic circuitry from the input jack through to the output jack To further complement this all new unit we have designed a totally new series of color coded knobs that not only provide function identification by color but also feature greatly improved visibility and touch indexing capability The Mark III Musician utilizes the latest BI FET and CMOS devices to enable signal processing and features that would have been totally out of reach for all but the most sophisticated recording studios just a short time ago Totally new circuitry utilizing the latest advances in semiconductors and design techniques provide the versatility built into the new Musician Our exclusive AUTOMIX function has been made considerably simpler and more efficient using LED indicators combined with active CMOS analog switches Each channel of the Musician is voiced slightly differently with Channel A having active equalization while Channel B offers passive equalization Each channel features an equalizer assign switch to enable pre programming either through or around the six band graphic equalizer These equalizer assign switches are extremely effective when using the AUTOMIX feature of the amplifier since they allow one channel to be routed through the graphic with the other channel routed around the graphic thus yielding a tremendous tonal variation when switching from channel to channel Our new phasor circuit utilizes new engineering techniq
16. tive and enables the voicing of Channel B to be changed significantly because of its advanced circuit design HIGH EQUALIZATION CONTROL 9 The high equalization control sets the amount of high end boost available and its effect is dramatic Overboosting of the highs is generally not desirable since it tends to cause a strident sound as well as tending to emphasize residual preamp noise Our egualizatiori circuit is very effective and experimentation will allow the user to achieve almost any tonal coloring desired POST GAIN CONTROLS 10 The post gain controls are the master gain controls for the respective channels The action of thes controls is conventional and experimentation will illustrate their function Please be aware that extremely low settings of the post gain controls will require extremely high settings of the pre gain controls with subsequent loss of dynamic range in the input preamp This may be desirable in some situations to create overload distortion effects in the input circuitry When a clean response is required it s generally desirable to maximize dynamic range in the input preamp because of the strong output signals generated by most modern pickups Optimum dynamic range occurs when the preamp is operated with lower settings of the pre gain and full clockwise settings of the post gain controls PHASOR Phasing is a rather interesting effect that involves the introduction of a variable frequency notch in the ampl
17. ts of boost are available One should avoid overboosting the lows since this will tend to require excessive amounts of power from the amplifier and might tend to prematurely overdrive the power amp at high boost clockwise settings HIGH ACTIVE EQUALIZATION CONTROL 6 The Channel A high equalization control is of the active shelving type capable of producing either a boost or cut of the high frequencies Its operation is similar to the low control in that a vertical straight up or 12 00 o clock position produces a flat response while counterclockwise positions yield cut and clockwise settings yield boost It s a good idea to avoid extreme boosting of high frequencies since this tends to encourage emphasis of residual preamp noise and also tends to make the amp sound strident and unduly emphasize string noises etc CHANNEL B EQUALIZATION LOW EQUALIZATION CONTROL 7 The low equalization control determines the low frequency emphasis and is capable of substantially more effect than many of the more conventional passive tonal networks For this reason the control will tend to make the amp sound bassy at high settings We have designed the circuitry to provide more tonal variation to allow you a greater range of variable tonalities MIDDLE EQUALIZATION CONTROL 8 The middle equalization control is used to tailor the relative levels of the vital mid range frequencies Experimentation with this middle control will show that it is very effec
18. turn RATE CONTROL 12 The rate control determines the speed of the built in phase oscillator You will note that the speed is variable from extremely slow to extremely rapid covering a far greater range than conventional phase or tremolo oscillators in fact effectively covering the operational range of both types Counterclockwise settings will produce an extremely slow speed with advancing speed as the rate control is rotated clockwise Please note that the rate control features an integral switch which is cut off in the full counterclockwise position to allow the phase Circuitry to cut completely out of the circuit from the front panel of the amp and without the footswitch Please note that the phase circuitry will not work nor can it be controlled by the remote switch if the circuit is cut off with the switch on the rate control which takes precedence over the remote footswitch NOTE BECAUSE OF THE MODULATING ACTION OF THE PHASOR IT IS A GOOD IDEA TO KEEP THE PHASE CIRCUIT CUT OFF WHEN NOT IN USE EITHER BY USE OF THE FOOTSWITCH OR WITH THE FRONT PANEL SWITCH ON THE RATE CONTROL TO AVOID MODULATING THE RESIDUAL NOISE FROM THE INPUT PREAMP E CUT THE PHASOR OFF WHEN NOT IN USE REVERB 13 To allow additional flexibility the new reverb system in the Musician is arranged in such a way that it works on both channels Any signal coming fromthe post gain control of either channel is sent to the reverb drive circuitry which in turn drives the reve
19. ues that avoid the many problems associated with the older FET based designs and the phasing effect and the timing oscillator circuitry combine to form what we feel is the most effective phasing unit ever incorporated into a musical instrument amplification system The reverberation unit is driven by a fully complementary circuit that uses the reverb coil itself in the feedback loop to electronically maximize the performance of the Hammond Type IV delay line The Musician also features a complete and versatile patching facility capable of driving any known power amplifier or line level effects device This patch panel includes stereo capability with the outputs from Channel A and B brought out separately as well as a specially compensated line output that delivers a signal that closely matches what is heard from the amplifier s speaker system making effective direct patching into mixers etc practical for the first time Each output is capable of driving 600 Ohm loads to better than 2 Volt levels The power output section of the Mark ill Musician is based on eight high voltage ultra fast output devices bolted to a massive aluminum heatsink This power section also includes a built in matching transformer to allow optimum performance with either 8 or 4 Ohm loads and includes adequate capabilities to effectively drive loads as low as 2 Ohms Reduced damping factor assures tube type overload qualities and tonal color Overall the Musician represents one
20. vel is approximately 2 Volts RMS and is a relatively low 600 Ohms output impedance The preamp out signal is connected through a switching contact to the power amp input jack and normally the preamp out is internally connected to the power amp s input This circuit allows basically two modes of operation When signal is taken from the preamp output signal is also delivered to the internal power amplifier If access to the internal power amplifier is needed or if some accessory device such as a noise gate delay line effects device etc is to be patched in line then the preamp output signal must be connected to the auxiliary unit s input while the auxiliary unit s output must be connected to the power amp input with shielded cables thereby placing the auxiliary unit in series or in line with the normal signal path Additional booster amp speaker combinations should be patched using the preamp output With this unique patching facility many interesting effects can be accomplished LINE OUT 19 Many attempts have been made over the years to patch the preamp circuitry of musical instrument amplifiers directly into recording or sound reinforcement mixing consoles Most of these attempts have been unsuccessful and have resulted in players and soundmen having to utilize various forms of what is popularly referred to as a direct box which of course means further complications expense etc Most previous attempts at patching signals out
21. vided UNDER NO CONDITIONS SHOULD THE BACK MOUNTED HEATSINK OR THE COOLING GRILLE ON TOP OF THE AMP BE BLOCKED OFF OR OBSTRUCTED DURING OPERATION When operating below 4 Ohms on an 8 Ohm tap or below 2 Ohms on a 4 Ohm tap the internal voltage current limiting circuit will limit the dissipation of the output devices and continuous operation in this overload condition will activate the automatic thermal protective circuitry This thermostatically controlled thermal protective circuitry is automatically resetting and will reactivate as soon as the junctions of the silicon output devices again reach safe operating temperatures LINE MAINS CORD RETAINER 27 We have provided two large molded line cord retainers on the rear panel to allow storage of the mains cable for travel In operation the cable should be completely unwrapped to allow maximum heat dissipation from the rear panel heatsink SPECHCATIONS OUTPUT POWER 210 watts RMS 1 THD into 4 ohms 300 watts RMS 1 THD into 2 ohms SENSITIVITY 15 mV 1 KHz Tone Controls Flat Volume 12 00 INPUT IMPEDANCE 2 220 K ohms SIGNAL TO NOISE RATIO 70 dB 50 K ohms source impedance Due to our efforts for constant improvement specifications are subject to change without notice EQUALIZATION CH A AUTOMIX CIRCUITRY OO 00O AUTO Pri REMOTE rea SWITCH EQUALIZATION CH B HE LO MID HI A PRE GAIN IN OUT SLEEVE 5 TEDS EEEEGTS Ww SE Ra 8 amp FROM
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