Conrad-johnson design MV60 Manuale utente

Thank you for selecting the MV60 to power your audio system. The

MV60 draws on two decades of research at conrad-johnson into the

reproduction of recorded music. The result is a power amplifier with a

remarkable ability to recreate the the dynamics, textures, tonalities, and

ambience of live musical performances. With the MV60, we believe that

you will experience the excitement of discovery in hearing more from

your favorite recordings than ever before.

Atconrad-johnson,weexpectourproductstobeasourceofsatisfaction

and of pride to their owners for many years to come. Accordingly, circuit

designs, parts and materials for all conrad-johnson products are se-

lected with a view to maintaining optimal performance over the years.

Our reputation for producing among the industry’s most reliable compo-

nents is a natural consequence of this engineering approach.

Although operation of the MV60 is quite straightforward, please take a

few minutes to read this manual for useful information on it’s installation

and operation.

In closing, we’d like to welcome you to the family of conrad-johnson

owners. We want you to enjoy your conrad-johnson product to the

fullest. To this end, our staff stands ready to answer any questions you

may have about the function and application of your MV60, and to

provide any needed service both during, and after the warranty period.

Our goal is to heighten your enjoyment of recorded music.

MV60 Owner’s Manual 1

Limited Warranty For Conrad-Johnson Components

conrad-johnson design, inc. will provide service under warranty to the

original owner on products sold new in the United States for the lesser

period of three years from the date of purchase by the original pur-

chaser, or five years from the date of shipment to the authorized

conrad-johnson dealer. During the warranty period, conrad-johnson will

repair defective units without charge for labor or parts (with the excep-

tion of vacuum tubes and batteries).

Exclusions. The following are not covered under this warranty:

a) Units which have been damaged by misuse, abuse, or accident.

b) Units which have been modified, altered, or improperly repaired by

anyone not specifically authorized by conrad-johnson design, inc.

c) Units not purchased from an authorized conrad-johnson dealer in the

United States for use in the United States.

d) Normal wear.

e) Incidental or consequential damages are not covered under this

warranty. Some states do not allow the exclusion of incidental or

consequential damages, so this exclusion may not apply to you.

Obtaining Warranty Service:To obtain warranty service, the unit must

be shipped, along with evidence of purchase, in factory packing to

conrad-johnson design (or designated service center) with freight and

insurance prepaid by the owner. After repair, the unit will be returned

with freight and insurance prepaid by conrad-johnson design to any

destination in the United States.

All implied warranties, including merchantability and fitness for a par-

ticular purpose are limited in duration to the duration of this express

warranty. Some states do not allow limitations on the duration of implied

warranties so the above limitations may not apply to you.

This warranty gives you specific legal rights and you may also have

other rights which vary from state to state.

MV60 Owner’s Manual 2

Conrad-Johnson products purchased outside the United States are

covered by warranty terms of the importing distributor in the country in

which the product was originally purchased, which may differ from the

terms set out herein. Importing distributors are not obligated to provide

warranty service for products originally purchased outside their country.

Conrad-Johnson will provide warranty service for products outside the

United States, but the customer must pay all shipping, handling and

customs costs both to and from our Service Department.

Questions about this warranty should be addressed to:

Service Department

conrad-johnson design, inc.

2733 Merrilee Drive

Fairfax, VA 22031

The conrad-johnson service department can also be reached by email

at [email protected], by phone at 703-698-8581, or by fax

at 703-560-5360

Service

If your conrad-johnson audio component requires service, repack it

using the original box and packing material and ship to the Service

Department address above. Boxes and packing materials can be ob-

tainedfromourservicedepartmentforanominalchargeifyounolonger

have yours. Include with the unit a note describing the problem you are

having in as much detail as possible. It is especially important for our

technician to know if the problem is intermittent. If you want an estimate

of cost for out of warranty service, be sure to request it in this note. Be

aware that requesting an estimate will delay service to your unit as we

will have to contact you for your approval before commencing service.

Registering The Warranty

Please return the enclosed card to the factory within 30 days of pur-

chase to register the warranty.

MV60 Owner’s Manual 3

CIRCUIT DESIGN

The MV60 circuit is notable for its elegant simplicity. A triode input

amplifiercomprisedofparalleledsectionsofa 12AX7A is direct coupled

to a cathode coupled differential phase inverter using high current

triodesto provide balanced, lowimpedance drive to thepush-pull output

stage.The output stagefeatures ultralinear operationof a pairof EL34s,

which permits high power levels while greatly reducing the source

impedanceofthe stage. As a result, theamplifieriscapableofsupplying

the large current demands of high amplitude musical transients driven

intoreactive speakerloads. A substantial main power supply ofmassive

polypropylene capacitors enables the MV60 to easily meet these ex-

traordinary current demands. Voltage regulators for the voltage amplifi-

ers and phase inverters provide nearly absolute isolation of these

sensitive stages from the output stages.

Optionally, the MV60 may be reconnected internally for triode operation

of the output stage, for exceptionally musical performance, but at con-

siderably reduced output power. The conversion is simple, but does

require soldering. Consult your dealer as to which configuration will

perform best in your system.

MV60 Owner’s Manual 4

INSTALLATION

As is the case with any vacuum-tube power amplifier, the MV60 dissi-

pates a significant amount of heat. Provision must be made for ade-

quate ventilation. Mount the unit on a flat, hard surface, taking care that

the ventilation holes in the bottom are unobstructed. Maintain at least

four inches of clearance above the unit, and at least three inches on

the sides. The cabinet or shelf should be open at both front and back.

For more restricted installations, cooling fans are essential.

The MV60 is supplied with a cover for the vacuum-tubes, which can be

secured by the two captive screws inside the cover. The cover provides

protection from the hot surfaces of the vacuum-tubes. It should always

be used in installations where there is any possibility that children or

pets may come near the amplifier.

All MV60s sold in the United States are configured for operation on a

60Hz ac power line producing between 108 and 126 volts. Export

versions of the MV60 will have the correct operating voltage and fre-

quency clearly marked on the back panel of the unit, near the ac power

cord. In all cases, the actual line voltage should be within + 5/- 10% of

the nominal rated voltage.

Electromagnetic Interference (EMI)

Considerable care has been taken in the design of the MV60 to mini-

mizeit’s susceptibilityto radio frequency interference and other formsof

EMI. Choice of materials, physical layout, grounding practice, and

power supply design have all been specified with a view to reducing the

impact of electromagnetic fields on the performance of this unit. At the

same time, however, our primary goal is the accurate reproduction of

recorded music in the normal home environment, and we have elected

notto compromise thisobjectivebytheapplicationof heavy-handed RFI

filters, or by using grounding practices that reduce RFI at the expense

of degraded audio performance. We find that the approach we have

taken has worked extremely well, resulting in only rare instances of EMI

problems which could be treated locally as needed, rather than compro-

mising the performance of our product in the 99.9% of installations

where EMI is not a problem.

MV60 Owner’s Manual 5

CareininstallationcanoftenavoidEMIinducedproblems.Thefollowing

practices should generally be observed in any application, and will be

especially important where EMI may be a problem.

Interconnect cables should be kept as short as possible (3 meters or

less), and shielded cable should be used (cable which has two center

conductors, and a separate external shield connected at only one end).

Physical location and cable "dress" can be an important factor in

minimizing hum pickup. The installation should situate the preamplifier

well away from the power amplifier, and power (ac mains) cords should

be dressed to remain at least 4" (100mm) away from input/output

cables.

CONNECTION

INPUT: Connectthe preamplifier toyour MV60 amplifierat the RCAtype

connectors located on the back of the amplifier.

OUTPUT: Five way binding posts are provided for connection of your

loudspeakers, with correct spacing to accept a standard "double ba-

nana" plug. They will also accept spade lugs, bare wire, or pin connec-

tors. The two channels should be connected in correct "relative phase".

This means that when the same signal is applied to both channels, the

right and left channels speaker diaphragms will move synchronously -

in and out together.

Terminals on speakers are usually coded - one designated "C",

"ground", "-" or black, the other designated "+" or red. "In phase"

connection of the speakers can normally be achieved by taking care to

connect the wire from the "+" amplifier terminal to the red or "+" coded

terminal on each speaker, and connecting the "-" terminal to the black

or "-" coded terminal on each speaker.

In phase connection of the speakers can be readily ascertained by ear.

Listen to a recording of a solo vocalist (use a mono recording if avail-

able). With the speakers in phase the voice should be clearly focused

between the two speakers. With the speakers connected out of phase,

the voice will be diffused, with no identifiable source. Relative phase

may be reversed by switching the "+" and "-" leads at one speaker only.

MV60 Owner’s Manual 6

Getting The Most From Your MV60

In a system of commensurate high quality components, the conrad-

johnson MV60 offers a high level of sophistication and refinement in

music reproduction. To get the best performance out of any audio

system, there are a number of important details which must be attended

to.

Absolute Phase

Musical notes are heard through the ear’s response to waves of alter-

nating rise and fall of air pressure. Musical transients are almost exclu-

sively positive: that is, the initial effect is a rise in pressure. The ear is

capable of distinguishing these positive transients from the musically

unnatural alternative of a negative transient (an initial fall in air pres-

sure). In terms of your stereo system, these transients are created by

your loudspeakers. If the speakers respond to musical transients by first

moving out, they are creating a rise in pressure, and the system is said

to be phase correct. If they respond by moving in, they create a fall in

pressure and the system is said to be phase inverting. Each component

in the stereo system either preserves the phase of the incoming signal,

and is said to be phase correct, or inverts the phase and is said to be

phase inverting. It is unimportant whether an individual component is

phase correct or phase inverting, as long as the system as a whole is

phase correct. This will be the case if the number of phase inversions is

even (or zero).

The MV60 is phase correct. If your system has an odd number of

inversions,thenyoumustaddonephase inversion. This is conveniently

done by reversing the positive and negative connections to your speak-

ers (be sure to reverse both channels).

If you are not sure about the phase of every piece in your system, you

can establish correct absolute phase by careful listening. When the

system is in correct phase, transients will be noticeably cleaner and

more sharply defined. The effect is especially apparent on plucked

string sounds. A final warning - not all recordings are phase correct

(including some "audiophile" recordings), so listen to several before

concluding your investigation of absolute phase.

MV60 Owner’s Manual 7

The Importance Of Wires

Interconnect and speaker wires are an important element in your stereo

system. Interconnects are available which will permit a reference quality

system to blossom and fulfill its promise of musical reality. Others will

strangle the system to the point where it becomes little better than

average. To complicate matters, our experience suggests that the

choice of interconnects will be system dependent - those that are top

ranked on one system may be a poor choice for a different system.

Consult your conrad-johnson dealer for recommendations for your spe-

cific system.

Questions: If you have questions about the installation or function of

your MV60 do not hesitate to call Customer Service at (703) 698-8581.

MV60 Owner’s Manual 8

TUBE REPLACEMENTS

The MV60 uses eight vacuum tubes of three different types: two

12AX7A (V1 and V2), two 6SN7 (V3 and V4) and four EL34s (V5

through V8). The brands of tubes we supply have been chosen by first

selecting those brands which are known to be most reliable, then by

extensive auditioning of these acceptable brands with the final choices

being made solely on the basis of sonic performance. We know of no

vacuum tubes available which will improve the sonic performance of

your MV60. We highly recommend that you purchase replacement tube

sets from conrad-johnson design.

We anticipate tube life to accommodate two to three years of operation

without degradation in normal use - if the amplifier is switched off when

notinuse.Ifitisleftonatalltimes, tubelifecanbeexhaustedinamatter

of a few months.

The MV60 has been designed to make tube replacement as simple as

possible.Because the output tubesare individually biased, replacement

tubes need not be matched pairs. No a-c balance adjustment is neces-

sary. It is necessary to re-bias the amplifier when the output tubes are

replaced. The MV60 has built in bias indicators so that no instruments

are required to make this adjustment.

ADJUSTING OUTPUT TUBE BIAS

Biasing the amplifier is a simple procedure that can easily be done by

the owner. Only a plastic screwdriver is required. A red plastic screw-

driver has been included with your amplifier for this purpose. After

replacing the tubes, the amplifier should be connected to a load (your

loudspeakerswillworkfine)and there should be nosignal appliedto the

amp. It should be connected to you preamplifier with the volume control

turned fully down. Turn the amplifier on. After about one minute, turn

each of the four screwdriver adjustable controls counterclockwise until

the associated indicator LED just goes off. Clockwise rotation may be

necessary first to turn the LED on; do not turn the adjusting screw any

further in the clockwise direction once the LED has come on.

After the amplifier has warmed up thirty minutes, the procedure just

described should be repeated. NOTE: It is normal for these LEDs to

flash or flicker when the amplifier is in use.

MV60 Owner’s Manual 9

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