Conrad-Johnson LP260M Manuel utilisateur

Conrad-Johnson Owner’s Manual:

LP260M Mono-block Power Amplifier

conrad-johnson It just sounds right.

Conrad-Johnson LP260m mono-block power amplifier Owner’s Manual

Thank you for selecting the LP260m mono-block power amplifier to

power your audio system. The LP260m mono-block power

amplifier draws on three 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 dynamics,

textures, tonalities, and ambience of live musical performances.

With the LP260m mono-block power amplifier, 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 LP260m mono-block power 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 LP260m mono-block power amplifier, and to provide any

needed service both during, and after the warranty period. Our

goal is to heighten your enjoyment of recorded music.

Conrad-Johnson LP260m mono-block power amplifier Owner’s Manual

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 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 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

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 which vary from state to state.

Conrad-Johnson LP260m mono-block power amplifier 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.

Conrad-Johnson LP260m mono-block power amplifier Owner’s Manual

Installation

As is the case with any vacuum-tube power amplifier, the LP260m

mono-block power 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

installations, cooling fans are essential.

All LP260m mono-block power 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 LP260m mono-

block power amplifier 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 LP260m

mono-block power amplifier 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. At the

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

of recorded music in the normal home environment, and 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 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

following 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

Conrad-Johnson LP260m mono-block power amplifier Owner’s Manual

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: Connect the preamplifier to your LP260m mono-block

power amplifier at the RCA type connector 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 banana" plug. They will also accept spade lugs, bare wire,

or pin connectors.

In a stereo system, 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.

Conrad-Johnson LP260m mono-block power amplifier Owner’s Manual

Vacuum Tube Replacement

The LP260m mono-block power amplifier uses ten vacuum tubes

of three different types: one type M8080 (V1), one type 6N30P

(V2), and eight type KT120 (V3 through V10). 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

LP260m mono-block power amplifier. 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 LP260m mono-block power amplifier 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 LP260m mono-block power amplifier has built in

bias indicators so that no instruments are required to make this

adjustment.

Conrad-Johnson LP260m mono-block power amplifier 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. It should be connected to your preamplifier with the

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

one minute, turn each of the eight 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 LP260m mono-block power amplifier has been

fitted with a plate supply fuse (5x20mm 2Amp fast-blow ceramic)

that is installed to protect the amplifier circuitry in the event of

output tube failure. The fuse holder is physically located inside the

amplifier in fuse clips on the power supply board.

What happens when the fuse blows? A blown plate fuse usually

indicates a marginal output tube and an attempt should be made to

identify and replace it, by either (a) replacing the fuse and turning

on the amp while watching the output tubes carefully; look for a

bright white or blue flash inside the tube. If nothing happens, then

(b) lightly tap the output tubes one by one with the plastic handle of

a screwdriver while watching for flashes inside the tube. If the

tubes are over two years old, or have more than 1,500 hours on

them, a complete replacement tube set is probably in order.

The sonic effects of a blown fuse are very low, very distorted

sounds from the speaker being driven by that channel.

TO AVOID SHOCK, ALWAYS UNPLUG THE AMPLIFIER AND

LET IT SIT FOR 30 MINUTES BEFORE REMOVING BOTTOM

COVER.

Replacement fuses are available from conrad-johnson dealers.

Conrad-Johnson LP260m mono-block power amplifier Owner’s Manual

Getting The Most From Your LP260m mono-block power

amplifier

In a system of commensurate high quality components, the

conrad-johnson LP260m mono-block power 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

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 LP260m mono-block power amplifier 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 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.

Conrad-Johnson LP260m mono-block power amplifier 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 LP260m mono-block power amplifier before listening:

The sonic performance of the LP260m mono-block power amplifier

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 LP260m mono-block power amplifier, do not hesitate to call

Customer Service at (703) 698-8581.

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