Conrad-johnson design CAV45 Bedienungsanleitung

Conrad-Johnson Owner’s Manual:

CAV45 Control Amplifier

conrad-johnson It just sounds right.

CAV45 Owner’s Manual

Thank you for selecting the CAV45 control amplifier as the control

center and power amplifier for your audio system. The CAV45

draws on three decades of research at conrad-johnson into the

reproduction of recorded music. The result is a control amplifier

with a remarkable ability to recreate the dynamics, textures,

tonalities, and ambience of live musical performances. With the

CAV45, we believe that you will experience the excitement of

discovery in hearing more from your favorite recordings than ever

before.

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

satisfaction and of pride to their owners for many years to come.

Accordingly, 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 CAV45 amplifier is quite straightforward,

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

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 CAV45, and to provide any needed service both during, and

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

recorded music.

CAV45 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

original purchaser, 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 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

accident.

b) Units that 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

particular 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 that vary from state to state.

CAV45 Owner’s Manual

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 in

these cases, 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.

2800K Dorr Avenue

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

CAV45 Owner’s Manual

nstallation

The CAV45 dissipates a significant amount of heat. For proper

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 should be open at front and back.

For more restricted installations, cooling fans are recommended.

The CAV45 is supplied with a cover to provide 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 CAV45s 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 CAV45 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 voltage should

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

Electromagnetic Interference (EMI)

Considerable care has been taken in the design of the CAV45 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 specified with a

view to reducing the impact of electromagnetic fields on the

performance of this unit. Our primary goal, however, is the

accurate reproduction of recorded music in a normal home

environment. We have elected not to compromise 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 our approach works 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.

Interconnect cables should be kept short (3 meters or less), and

shielded cable should be used.

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

minimizing hum pickup. Power (ac mains) cords should be dressed

to remain at least 4" (100mm) away from input/output cables.

CAV45 Owner’s Manual

onnection

SOURCES (INPUT1, INPUT2, INPUT3): These high level inputs

are electronically equivalent. Connect any high-level source such

as CD player, Tuner, DAC, etc. to these inputs.

RIGHT OUTPUT, LEFT OUTPUT: Five-way binding posts are

provided for connection of your loudspeakers, with correct spacing

to accept a standard "double 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

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

ontrols

<power>: Rocker switch to power the CAV45 on.

<selector>: Use this rotary switch to select between the three

available high-level inputs.

<level>: Level setting is accomplished by the rotary level control.

CAV45 Owner’s Manual

acuum Tube Replacement

The CAV45 uses seven vacuum tubes of three different types: one

type 6922 (V1), two type 5965 (V2 and V3), and four type EL34

(V4 through V7). 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 CAV45. 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 not in use. If it is left on at all times, tube life can

be exhausted in a matter of a few months.

The CAV45 has been designed to make tube replacement as

simple as possible. Because the output tubes are individually

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

balance adjustment is necessary. It is necessary to re-bias the

amplifier when the output tubes are replaced. The CAV45 has built

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

adjustment.

CAV45 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

loudspeakers will work fine) and there should be no signal applied

to the amp and the volume 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

procedure should be performed whenever the amplifier's output

tubes are replaced and after each six months of average use.

PLATE FUSE: Your CAV45 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 inside

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

board. The fuses are 5x20mm 800mA F-type (fast blow) 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 CAV45 operates at high voltages. The chassis

should only be opened by qualified, experienced persons. NEVER

remove the bottom cover of the chassis without first unplugging the

unit from the ac mains and allowing ample time for power supplies

to drop to safe voltages.

Replacement fuses are available directly from conrad-johnson or

from our dealers.

CAV45 Owner’s Manual

etting The Most From Your CAV45 Control

Amplifier

In a system of commensurate high quality components, the

conrad-johnson CAV45 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

alternating 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 a negative

transient (an initial fall in air pressure). 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 CAV45 is phase correct (non-inverting). If your system has an

odd number of inversions, (if you have a phase inverting source)

then you must add one phase inversion. This is conveniently done

by reversing the positive and negative connections to your

speakers (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.

CAV45 Owner’s Manual

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 specific system.

Performance Tip

Warm up the CAV45 before listening: The sonic performance of

the CAV45 improves noticeably as the unit warms up. The

midrange becomes more lucid, the highs smoother, and the

soundstage expands. The warm up period can be expected to last

about fifteen minutes.

Questions: If you have questions about the installation or function

of your CAV45 do not hesitate to call Customer Service at (703)

698-8581.

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