Conrad-johnson design One-b Manuel utilisateur

Congratulations on your purchase of the conrad-johnson Premier One-b

amplifier. You have acquired one of the finest pieces of musical repro-

ductionequipmentavailabletoday.ThePremierOne-bwasdesignedfor

the purpose of providing ourselves and the community of designers of

high-end audio equipment with a reference amplifier. It is the result of 10

manyearsofresearchintotheapplicationofvacuumtubedevicestothe

reproduction of recorded music. The design and materials have been

carefully selected to yield years of unvarying excellence.

Please take a few minutes to read this manual so that you will better

understand the features and capabilities of your Premier One-b.

Premier One-b Owner’s Manual 1

LIMITED WARRANTY FOR THE CONRAD-JOHNSON Premier One-b

1. conrad-johnson design, inc. warrants that the conrad-johnson Pre-

mier One-b will be free from defects in material and workmanship for a

period of three years from the date of original purchase.

2. conrad-johnson will repair defective units without charge for labor or

parts (with the exception of the vacuum tubes) subject to the following

conditions:

a) The unit must not have been altered or damaged through

misuse, abuse, negligence, accident or improper operation.

b) The purchaser must provide evidence of purchase at the time

service is requested.

c) All repairs must be undertaken at the factory or other service

center designated by conrad-johnson design, inc. Units submitted

for warranty repairs must be shipped in the factory packing carton

to conrad-johnson design or its designated service center, freight

and insurance prepaid by the owner, and will be returned to the

owner, freight and insurance prepaid by conrad-johnson design.

Replacement cartons are available from the factory for a nominal

charge.

d) Normal wear and maintenance are not covered by this warranty.

3. The above warranty may be transferred to subsequent owners pro-

vided that the warranty registration card has been returned to conrad-

johnson design, inc. within 30 days of the original purchase and that the

registeredowner providesthe factorywith asignednoticegivingthe new

owner’s name and address and the model and serial number of the unit.

4. Where permitted by law, conrad-johnson design’s liability shall be

limited to that set forth in this warranty. No other warranty of any kind,

expressed or implied, is made by conrad-johnson design, inc., and all

implied warranties, including merchantability and fitness for a particular

"purpose", which exceed the obligations and time limits set forth herein

arehereby disclaimed. conrad-johnson design, inc. shall not be liable for

incidental or consequential damages. Some states do not allow the

exclusion or limitation of incidental or consequential damages, or limita-

tions on how long an implied warranty lasts, so the above limitation or

exclusion may not apply to you.

Premier One-b Owner’s Manual 2

5. This warranty gives you specific legal rights, and you may also have

other rights which vary from state to state. Questions about warranty

service should be addressed to:

Service Department

conrad-johnson design, inc.

2733 Merrilee Drive

Fairfax, Virginia 22031

REGISTERING THE WARRANTY

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

chase to register the warranty. Proper registration of the warranty is

important! It will enable us to inform you of any alterations in the design

of a given model and of any new products we offer which are likely to be

of interest to you.

Premier One-b Owner’s Manual 3

INSTALLATION

Because of the number and type of vacuum tubes, the Premier One-b

dissipates considerable heat (approximately 500 watts at idle). It is

essential, therefore, that proper attention be paid to ventilation. The unit

should be mounted horizontally on a flat hard surface so that the

ventilation holes in the bottom are unobstructed. At least eight inches of

clearance should be provided above the unit, and at least four 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 front panel of the Premier One-b will fit in a standard 19" equipment

rack and is designed to carry the weight of the unit so that it may be rack

mounted. Again, it is important that adequate clearance be provided

above so that ventilation is not impeded. About eight inches of the front

of the rack should be left open above the unit.

To minimize hum pickup, keep the unit well away from the preamplifier

and turntable and route power cords away from input cables.

THE Premier One-b IS TO BE OPERATED ONLY ON AC LINE VOLT-

AGE OF 108 TO 125 VOLTS.

The Premier One-b is available wired for 100 volt, 120V, 220V or 244

volt, 50/60 Hz current.

CONNECTION

INPUT: Connect the preamplifier to your Premier One-b amplifier at the

RCA type connections located on the back of the amplifier.

OUTPUT: Terminal strips are provided for connection of your loudspeak-

ers. They will accept bare wire or spade lug connectors.

Three different taps- 4 ohm, 8 ohm, and 16 ohm are provided in addition

to the "C" or ground tap.

Matching the rated nominal output impedance of your speakers with the

amplifier output taps will not necessarily guarantee optimum perfor-

mance.Thesoundwithagivensetof speakerswillvarywiththedifferent

Premier One-b Owner’s Manual 4

impedance taps. We suggest listening to each of the three taps to select

the best match for your speakers.

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 should move synchronously - in

and out together. Terminals on the speakers are usually coded-one

designated "C", "earth", "ground", "" or black, the other designated "+"

or red.

"In phase" connection of the speakers can normally be achieved by

takingcareto connect the wire from the 4,8, or 16 ohm amplifier terminal

marked on each channel to the red or "+" coded terminal on each

speaker, and connecting the "C" tap to the black or ’-’ coded terminal on

each speaker.

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

With the preamplifier mode switched into the MONO position, play a

record of a solo vocalist. With the speakers in phase the voice should

be clearly focused between the two speakers. With the speakers con-

nected 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.

GETTING THE MOST FROM YOUR CONRAD-JOHNSON Premier

One-b

The conrad-johnson Premier One-b offers an unparalleled level of

sophistication and refinement in music reproduction, but it cannot trans-

form an inferior stereo system. Only the very best loudspeaker systems

will be capable of fully revealing the capabilities of this precision instru-

ment. On the other hand, the Premier One-b is ruthlessly revealing. For

example, it can render unacceptable faults in the phono system which

may be just discernible with an amplifier of lower resolution.

Proper set-up is important in any high-fidelity system, but with state-of-

the-art components it is essential. Before attempting to evaluate the

Premier One-b, be sure that your phono system has been set up

carefully according to manufacturer recommendations. Adjustment of

the cartridge vertical tracking angle can be especially critical with mod-

ern stylus configurations.

Premier One-b Owner’s Manual 5

Given a system of high quality components, there remain 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 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 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 is either phase correct or phase inverting (including the cartridge

andspeakers-these arenormallyphase correct).It is ofno consequence

if an individual component is phase inverting, as long as the system as

a whole is phase correct. This will be the case as long as the number of

phase inversions is even (or zero). If your system has an odd number of

inversions, then you must add one phase inversion. This is conveniently

done by reversing the positive and negative connections on either your

cartridge or your speakers (be sure to reverse both channels).

If you are not sure about the phase of every component 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

moresharplydefined. Theeffect isespeciallyapparentonplucked string

sounds. A final warning-not all records are phase correct (including

some "audiophile" recordings), so listen to several before concluding

your investigation of absolute phase.

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 no better than

average. To complicate matters, our experience suggests that the

choiceofinterconnectswill be system dependent - those that are ranked

first on a given system may be a poor choice for a different system.

Premier One-b Owner’s Manual 6

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

cific system.

QUESTIONS?

If you have any questions about the installation or function of your

Premier One-b do not hesitate to call Customer Service at (703) 698-

8581.

TUBE REPLACEMENTS

ThePremier One-buseseighteen vacuumtubes of threedifferent types:

two 5751 (V1 and V2), two 6FQ7 (V3 through V6) and twelve EL34s (V7

throughV18).Eachtypehasbeen carefullychosenfor itscircuitapplica-

tion. It is well known that tubes of a given type vary sonically depending

on the manufacturer. We have chosen the brands of tubes that we

supply based on extensive auditioning of available brands. The choice

of brand has been made solely on the basis of sonic performance and

reliability without regard to either cost or prestige. We know of no

vacuum tubes available which will improve the sonic performance of

your Premier One-b. Also, the tubes in your amplifier have been tem-

pered by a controlled burn-in procedure that permits them to perform for

a greatly extended period without degradation in normal use. We highly

recommend that, when the time comes to replace the vacuum tubes,

you purchase replacement tube sets from conrad-johnson design.

The Premier One-b has been designed to make tube replacement as

simple as posssible. Because the output tubes are individually biased,

replacement tubes need not be matched pairs. No a-c balance adjust-

ment is necessary. It is necessary to re-bias the amplifier when the

outputtubes arereplaced. ThePremier One-bhasbuilt inbias 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

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

Premier One-b Owner’s Manual 7

each of the twelve screwdriver adjustable controls (marked in the dia-

gram)counter clockwise 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 farther 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 is normal and no cause

for alarm. This biasing procedure should be performed whenever the

amplifier’s output tubes are replaced, and after each six months of use.

V13

V9 V3

V5 V6

V11

V15

V17

V12

V10

V18

V16

V14

Premier One-b Owner’s Manual 8

FUSES

LiNE FUSE: The AC line is fused to protect the power transformer. This

fuse will not fail in normal operation. Failure of the fuse is a symptom of

amoreseriousproblem,sotheunitshould betakentoaqualifiedservice

center. IN NO EVENT SHOULD THE FUSE BE REPLACED WITH A

FUSE OF DIFFERENT TYPE OR RATING THAN THAT SUPPLIED BY

THE FACTORY.

PLATE FUSE: Your Premier One-b has been fitted with plate supply

fuses which are designed to protect the amplifier circuitry in the event of

output tube failure. The fuse holders are physically located near the

speakerconnectors. The capunscrewscounter clockwise toremovethe

fuse (a BUSS BBS-2). An LED near the fuse holder will light when the

fuse is blown.

What happens when the fuse blows? If one of these fuses should blow,

it usually indicates a marginal EL34 tube (one of six for each channel)

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 EL34s

carefully; if a bright white or blue flash is seen inside the tube, you’ve got

the culprit. If nothing happens, then (b) lightly tap the EL34s one by one

with the plastic handle of a screwdriver while watching for flashes inside

thetube.Ifalleffortstoidentifythebadtubefail,thebestcourseofaction

is to replace all tubes in the channel that blew the fuse. 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 TURN OFF THE AMPLIFIER BEFORE

REMOVING THE FUSE HOLDER CAP.

Replacement fuses and tubes are available from conrad-johnson deal-

ers.

Premier One-b Owner’s Manual 9

SPECIFICATIONS:

Power: 150 watts per channel RMS, both channels driven into 4, 8, or

16 ohm load from 30Hz to 15kHz with no more than 1% total harmonic

distortion or intermodulation distortion.

Sensitivity: 1.0 volt to full power.

Small Signal Distortion: Less than .05% at midband

Phase: Phase correct (non-inverting)

Frequency response: 20Hz to 20KHz +0, -.5dB

Hum and noise: 96dB below full power output.

Input Impedance: 100K ohms.

Dimensions: 22D x 19W x 10.5H inches.

Weight: 135 lbs.

Premier One-b Owner’s Manual 10

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