Conrad-johnson design PREMIER 17LS Manual de usuario

Thank you for selecting the Conrad-Johnson Premier 17LS line stage

preamplifier as the control center for your audio system. The Premier

17LS is our most affordable implementation of the engineering ad-

vances pioneered in our flagship Anniversary Reference Triode pream-

plifier. The Premier 17LS is capable of remarkably faithful recreation of

thedynamics,textures,tonalities,andambienceoflivemusicalperform-

ances. Using it, we believe that you will experience the excitement of

discovery in hearing more from your favorite recordings than ever

before.

Atconrad-johnson, weexpect ourproducts tobe asource ofsatisfaction

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 the Premier 17LS has been designed to operate in an intui-

tively apparent way, you will find useful information on it’s installation

and operation in this manual. Please take a few minutes to read the

manual to better understand the features and capabilities of your Pre-

mier17LS.Notethatthisunitisphaseinverting.See the section entitled

"Getting The Most From Your Premier 17LS" for details on correct

hookup in your system.

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 Premier 17LS, and

to provide any needed service both during, and after the warranty

period. Our goal is to heighten your enjoyment of recorded music.

Premier 17LS 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.

Premier 17LS 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 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.

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-

tained from our service department for a nominal charge, 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 awarethat requestinganestimatewilldelayservicetoyourunit

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

Premier 17LS Owner’s Manual 3

Installation

The first step in preparing your Premier 17LS preamplifier for use is to

install the vacuum-tubes. To do this, remove the top plate of the tube

guardbyremoving thefourscrews securingitto the guard.The Premier

17LS uses four type 6922 tubes. After checking the pin orientation,

insert one tube in each tube socket. Next, fit two of the included silicone

rubber rings over each tube, spaced at roughly 1/3 and 2/3 distances.

These rings will minimize the effects of air-borne microphonics on the

tubes. Finally, reinstall the top plate of the tube guard.

Set Up

To maintain proper ventilation, mount the Premier 17LS horizontally on

aflat,hard surface, andtakecare that theventilationholes in thebottom

are unobstructed. Allow at least two inches of clearance above the unit

andkeep thecabinetorshelfopen attheback.Verticalinstallationisnot

recommended.

All Premier 17LS sold in the United States are configured for operation

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

versionsofthe Premier 17LSwillhave the correctoperatingvoltage 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.

Premier 17LS Owner’s Manual 4

Electromagnetic Interference (EMI)

Considerable care has been taken in the design of the Premier 17LS to

minimize it’s susceptibility to radio frequency interference and other

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

andpowersupply designhaveall beenspecifiedwith a viewto 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

theexpenseof degradedaudioperformance. Wefindthat the approach

we have taken has worked extremely well, resulting in only rare in-

stances 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.

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.

Premier 17LS Owner’s Manual 5

Connection

SOURCES (PH/AUX1, TUNER, CD, VIDEO, AUX2): These high level

inputs are electrically equivalent. The load they present to the source

varies with the volume control setting, but in no case will it drop below

12 kohms. Connect the corresponding source components to these

inputs.

EXTERNAL PROCESSOR LOOP (EPL1): A set of line-level inputs and

outputs provided for connection of external signal processors (e.g.

parametric equalizer, tone controls). These can also be used for the

connection of a tape recorder. In this case, connect the EPL OUT to the

recording input of your tape recorder, and the EPL IN to the output of

your tape recorder. The EPL IN connection can also be used as an

additional line level input.

THTR/EPL2: This is an external processor loop designed to conven-

iently accommodate the addition of a surround-sound processor (SSP)

to a high-quality two channel system without compromising two channel

performance. Connect the front left and front right channel outputs from

your SSP to the THTR/EPL2 input. You can also connect the

THTR2/EPL2 OUT to an input on your SSP, allowing you to do matrix

processing on selected two channel sources. When this THTR loop is

selected, the level controls are set to unity gain. Level and balance

control is then accomplished via your surround sound processor.

MAIN OUT1 and MAIN OUT2: Connect to the input of your amplifier (or

crossover in a bi-amplified system). We recommend the use of an

amplifier with an input impedance of 20k ohms or higher. Since the

Premier 17LS inverts phase, it may be necessary to invert the speaker

leads to maintain correct absolute phase. See the section on "Getting

the most out of your Premier 17LS" for an explanation.

Premier 17LS Owner’s Manual 6

Controls

power: Press the button labeled power to switch the preamplifier on. A

time delay auto-muting circuit is incorporated into the Premier 17LS to

eliminate transients generated by the warm-up, and cool down cycles of

thevacuum-tubes. Alloutputs aregroundedviarelaysforapproximately

90 seconds after the unit is turned on in order to suppress warm-up

transient noises. During this auto-muting period, the mute indicator led

(located next to the mute button) will flash. All control functions are

disabled during the auto-muting cycle. The muting relay also grounds

the outputs immediately at turn-off or in the event of any power line

interruption. When the Premier 17LS is turned off (by pressing the

power switch again), the standby led (located in the display window) will

be illuminated.

When first connected to ac mains, or after an interruption of power, the

Premier 17LS will turn on in a default mode (after auto-muting), with the

level set at 20, and the CD input selected. In subsequent sessions, as

long as the ac mains has not suffered a power outage, the unit will turn

on at the last used volume setting and input.

source (phono/aux1, tuner, cd, video, aux2): Pressing the button

labeled source will cause the unit to step through these five inputs, in

the order displayed on the front panel. The selected input will be

indicated by an illuminated led.

epl (source, epl1, epl2/theater): Pressing the epl button will cause the

unittostep from sourcethroughthe two externalprocessorloops. When

source is selected, the input selected as source will be passed directly

to the volume control. When EPL1 or EPL2/THEATER are selected, the

selected source will first pass through the external processor loop

before being routed to the volume control. When EPL2/THEATER is

selected, the level will be set and locked to unity gain.

vol dn, vol up: Level setting on the Premier 17LS is achieved by using

a programmed microprocessor to select combinations from among an

array of high-quality precision resistors. This arrangement allows 100

steps of approximately .7 dB per step. The steps are numbered 0

through 99, with 0 being silence, and 99 being maximum volume.

Premier 17LS Owner’s Manual 7

The level setting can be changed by pressing the vol dn and vol up

buttons on the front panel. Each time a button is pressed, the level will

move up or down one step. If a button is pressed and held, the level

control will cycle through the steps at an accelerating rate. With each

step, a slight "click" will be heard from the opening and closing relays

insidethe Premier17LS.Balance canonly besetviatheremote control.

mute: Pressing the mute button will silence the preamplifier main

outputs,and setthe leveldisplaytozeroonbothchannels.Pressingthe

mute button again will restore the previously selected level setting.

Remote Control

All operations of the Premier 17LS can be controlled by the handheld

wireless remote unit.

MUTE: Pressing the mute button will cause the main outputs to mute

and the level display to be zero. Pressing it again will restore the last

level setting. Pressing and holding the mute button for more than three

seconds will switch the Premier 17LS into standby mode (all tube

circuitry switched off). Pressing the mute button when the unit is in

standby mode will switch it back on.

PH/AUX,TUNER, CD,VIDEO,AUX2: You candirectlyaccessanyinput

by pressing the associated button on the remote.

EPL1, EPL2: Pressing the EPL buttons will insert the associated exter-

nal processor in the signal path. Pressing the button again will re-estab-

lish a direct connection to the selected source. Note that pressing the

EPL2 button selects the THTR/EPL2 input, setting the level to unity

gain.

LEVEL - +: Duplicates the function of the front panel vol dn, vol up

controls.

BALANCE: Allows attenuation of either channel independently of the

other.Pressingthe right balancebuttonwill reduce theleftchannel level

setting by one step. Pressing and holding the right balance button will

cause the left channel to cycle down through its level settings at an

acceleratingrate. Pressingtheleftbalancebutton willattenuate theright

channel in the same manner.

Premier 17LS Owner’s Manual 8

Vacuum Tube Replacement

The Premier 17LS circuit employs four vacuum tubes (V1 - V4), all

6922s. The 6922 offers low noise, low microphonics, and gain well

suited to use in a zero-feedback line-stage. 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 Premier 17LS. The tubes in your

preamplifier have been tempered by a controlled burn-in procedure that

permits them to perform for a greatly extended period without sonic

degradation, then selected for minimum residual noise. Replacement

tubes are prepared and selected in the same way. Therefore, 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 preamplifier is switched off

when not in use. If the preamplifier is left on at all times, tube life can be

exhausted in a matter of a few months.

Premier 17LS Owner’s Manual 9

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