Conrad-johnson design Classic Sixty Manuel utilisateur

Conrad-Johnson Owner’s Manual:

Classic Sixty Vacuum-Tube Amplifier

conrad-johnson It just sounds right.

Classic Sixty Owner’s Manual

Thank you for selecting the Classic Sixty amplifier to power your

audio system. The Classic Sixty draws on three decades of re-

search at conrad-johnson into the reproduction of recorded music.

The result is a power amplifier with a remarkable ability to recreate

the dynamics, textures, tonalities, and ambience of live musical

performances. With the Classic Sixty, we believe that you will ex-

perience the excitement of discovery in hearing more from your fa-

vorite recordings than ever before.

At conrad-johnson, we expect our products to be a source of satis-

faction and of pride to their owners for many years to come. Ac-

cordingly, circuit designs, parts and materials for all conrad-

johnson products are selected with a view to maintaining optimal

performance over the years. Our reputation for producing among

the industry's most reliable components is a natural consequence

of this engineering approach.

Although operation of the Classic Sixty amplifier is quite straight-

forward, please take a few minutes to read this manual for useful

information on its 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 prod-

uct to the fullest. To this end, our staff stands ready to answer any

questions you may have about the function and application of your

Classic Sixty, and to provide any needed service both during, and

after the warranty period. Our goal is to heighten your enjoyment of

recorded music.

Classic Sixty Owner’s Manual

imited 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 origi-

nal purchaser, or five years from the date of shipment to the au-

thorized conrad-johnson dealer. During the warranty period, con-

rad-johnson will repair defective units without charge for labor or

parts (with the exception of vacuum tubes and batteries).

Exclusions. The following are not covered under this warranty:

a) Units that have been damaged by misuse, abuse, or acci-

dent.

b) Units that have been modified, altered, or improperly re-

paired 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 inci-

dental 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 pack-

ing 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

particular purpose are limited in duration to the duration of this ex-

press warranty. Some states do not allow limitations on the dura-

tion 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 that vary from state to state.

Classic Sixty Owner’s Manual

Conrad-Johnson products purchased outside the United States are

covered by warranty terms of the importing distributor in the coun-

try in which the product was originally purchased, which may differ

from the terms set out herein. Importing distributors are not obli-

gated to provide warranty service for products originally purchased

outside their country. Conrad-Johnson will provide warranty service

for products outside the United States, but in these cases, the cus-

tomer 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 e-

mail 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

purchased through our service department if you no longer 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 approval before

commencing service.

Registering The Warranty

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

purchase to register the warranty

Classic Sixty Owner’s Manual

nstallation

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

Sixty amplifier dissipates a significant amount of heat. Provision

must be made for adequate 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 installa-

tions, cooling fans are essential.

All Classic Sixty amplifiers 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 Classic Sixty will have the correct

operating voltage and frequency clearly marked on the back panel

of the unit, near the ac power cord. In all cases, the actual line volt-

age should be within + 5/-10% of the nominal rated voltage.

Electromagnetic Interference (EMI)

Considerable care has been taken in the design of the Classic

Sixty to minimize its susceptibility to radio frequency interference

and other forms of EMI. Choice of materials, physical layout,

grounding practice, and power supply design have all been speci-

fied with a view to reducing the impact of electromagnetic fields on

the performance of this unit. At the same time, however, our pri-

mary goal is the accurate reproduction of recorded music in the

normal home environment, and we have elected not to compro-

mise this objective by the application of 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 compromising the performance of our product in the 99.9% of

installations where EMI is not a problem.

Care in installation can often avoid EMI induced problems. The fol-

lowing 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).

Classic Sixty Owner’s Manual

Physical location and cable “dress” can be an important factor in

minimizing hum pickup. The installation should situate the pream-

plifier 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.

Classic Sixty Owner’s Manual

onnection

INPUT: Connect the preamplifier to your Classic Sixty amplifier at

the RCA type 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 "dou-

ble banana" plug. They will also accept spade lugs, bare wire, or

pin connectors.

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 synchro-

nously -in and out together. Terminals on speakers are usually

coded -one designated "C", "ground", "-" or black, the other des-

ignated "+" or red. "In phase" connection of the speakers can nor-

mally 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 available). 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 switch-

ing the "+" and "-" leads at one speaker only.

Classic Sixty Owner’s Manual

acuum Tube Replacement

The Classic Sixty uses seven vacuum tubes of three different

types: one type 6189 (V1), two type 6922 (V2 and V3), and four

type EL34 (V4 through V7). In the Classic Sixty SE, the output

tubes (V4 through V7) are changed to KT120s. Note: the KT120 is

NOT a plug in replacement for the EL34 –the bias circuit must be

revised to make this substitution. 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 accept-

able 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 Classic Sixty. We

highly recommend that you purchase replacement tube sets from

conrad-johnson design.

We anticipate tube life to accommodate two to three years of op-

eration without degradation in normal use -if the amplifier is

switched off when not in use. If it is left on at all times, tube life can

be exhausted in a matter of a few months.

The Classic Sixty has been designed to make tube replacement as

simple as possible. Because the output tubes are individually bi-

ased, replacement tubes need not be matched pairs. No a-c bal-

ance adjustment is necessary. It is necessary to re-bias the ampli-

fier when the output tubes are replaced. The Classic Sixty has built

in bias indicators so that no instruments are required to make this

adjustment.

Classic Sixty Owner’s Manual

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 (one has been

included with your amplifier for this purpose). After replacing the

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

speakers will work fine) and there should be no signal applied to

the amp. It should be connected to your preamplifier with the vol-

ume control turned fully down. Turn the amplifier on. After about

one minute, turn each of the four screwdriver adjustable controls

(located near the output tube sockets) 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. This biasing proce-

dure should be performed whenever the amplifier's output tubes

are replaced and after each six months of average use.

PLATE FUSE: Your Classic Sixty has been fitted with plate supply

fuses that are installed to protect the amplifier circuitry in the event

of output tube failure. The fuse holders are physically located in-

side the chassis at the ends of the vertically mounted power supply

pc board. The fuses are 5x20mm 800mA T-type ceramic fuses.

LEDs labeled FUSE OUT are located on the top of the chassis,

one on either side of the center transformer. If a plate fuse blows,

the associated LED will light. The sonic effects of a blown fuse are

very low, very distorted sounds from the speaker being driven by

that channel.

WARNING: the Classic Sixty operates at high voltages. The chas-

sis should only be opened by qualified, experienced persons.

NEVER remove the bottom cover of the chassis without first un-

plugging the unit from the ac mains and allowing ample time for

power supplies to drop to safe voltages.

Replacement fuses are available from conrad-johnson dealers.

Classic Sixty Owner’s Manual

etting The Most From Your Classic Sixty Amplifier

In a system of commensurate high quality components, the

conrad-johnson Classic Sixty amplifier offers an unparalleled 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 that must be attended to.

Absolute Phase

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

ternating rise and fall of air pressure. Musical transients are almost

exclusively 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 anegative transient (an initial

fall in air pressure). In terms of your stereo system, these tran-

sients 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 re-

spond 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 invert-

ing. 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 inver-

sions is even (or zero).

The Classic Sixty is phase correct (non-inverting). If your system

has an odd number of inversions, (for example, if you have a

phase inverting preamplifier) then you must add one phase inver-

sion. This is conveniently done by reversing the positive and nega-

tive connections to your speakers (be sure to reverse both chan-

nels). If you are not sure about the phase of every piece in your

system, you can establish correct absolute phase by careful listen-

ing. When the system is in correct phase, transients will be no-

ticeably cleaner and more sharply defined. The effect is especially

apparent on plucked string sounds. A final warning -not all re-

cordings are phase correct (including some “audiophile” re-

cordings), so listen to several before concluding your investigation

of absolute phase.

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