Conrad-johnson design Premier Ten User manual

Congratulations on your purchase of the conrad-johnson Premier Ten

vacuumtubeline-stagepreamplifier.Youhaveacquiredoneofthefinest

pieces of music reproduction equipment available today. The result of

more than a decade of research by conrad-johnson design into the

application of vacuum tube devices to the reproduction of recorded

music, the Premier Ten was designed to establish the reference stand-

ard among line-stage preamplifiers for reproducing the dynamics, to-

nalities, textures and ambience of a live musical performance. 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 Ten. NOTE

THAT THE PREMIER TEN IS PHASE INVERTING. See the section

entitled "Getting the most from your Premier Ten" for details on correct

hookup in your system.

Premier Ten Owner’s Manual 1

LIMITED WARRANTY FOR THE conrad-johnson Premier

Ten

1. conrad-johnson design, inc. warrants to the original purchaser that

the PremierTen willbe freeof defectsin materialsand workmanshipfor

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

registered owner provides the factory with a signed notice giving the

newowner’s nameand address andthe modeland serialnumber 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

are hereby 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 limitations or

exclusions may not apply to you.

Premier Ten Owner’s Manual 2

4. 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, VA 22031

REGISTERING THE WARRANTY

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

chasetoregisterthewarranty.Thewarrantymaybetransferredtoanew

owner if it has been properly registered initially and if the registered

owner sends a signed notice providing the name and address of the

new owner and the model and serial number of the unit.

Proper registration of the warranty is important! Not only will it preserve

transferability of your warranty, it will also 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 Ten Owner’s Manual 3

INSTALLATION

The Premier Ten dissipates a significant amount of heat (approximately

20 watts). Accordingly, proper attention should 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 two inches

of clearance should be provided above the unit and the cabinet or shelf

should be open at the back. Vertical installation is not recommended.

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

amplifier, and route power cords away from input cables.

The Premier Ten requires an ac power line providing between 108 and

125 volts at 50 to 60 Hz. Alternatively, the Premier Ten is optionally

available for operation on 100, 220, or 240 volt power lines.

CONNECTION

AUX/PH, TUNER, CD, TAPE 1, TAPE 2: These high level inputs are

electrically equivalent. They present a 17k ohm load to the source. The

outputs of your tape recorders should be connected to TAPE 1 and

TAPE 2 connectors.

RECORD 1, RECORD 2: The record outputs connect the selected

signaltoyourtaperecordersorexternalprocessingloop(eg.equalizer).

This output signal is not affected by the level and balance controls.

Connect to the inputs of your tape recorders or external processors.

OUTPUT: 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 Ten inverts

phase, it may be necessary to invert the speaker leads to maintain

correctabsolute phase. See thesection on "Getting themost out of your

Premier Ten" for an explanation of this.

Premier Ten Owner’s Manual 4

USE OF EXTERNAL TONE CONTROLS OR OTHER

EXTERNAL SIGNAL PROCESSING DEVICES:

Use Tape 1 and Record 1 for your tape recorder. Connect the output of

the tone controls to Tape 2 and the input of the tone controls to Record

2. To use the tone controls, select Tape 2 on the Source Selector and

use the Record Selector to select phono, tuner, cd or tape 1. By

selecting the input directly on the source selector, the tone control

processor will be bypassed.

Premier Ten Owner’s Manual 5

CONTROLS

OFF, POWER: Because of the delayed warmup characteristics of vac-

uum tube equipment, a time delay muting circuit is incorporated in this

preamplifier. All outputs are grounded via relays for approximately 90

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

transient noises. During this muting period, and any time that the mute

button is depressed, the red mute indicator led will flash. The muting

relay also grounds the outputs immediately at turn-off or in the event of

any power line interruption.

SOURCE SELECTOR: AUX/PH, TUNER, CD, TAPE 1, TAPE 2: This

selector switch is used to choose an input for listening.

RECORD SELECTOR: AUX/PH, TUNER, CD, TAPE 1, TAPE 2.: This

control selects the signal to the record outputs, allowing the user to

record one source while listening to another.

BALANCE: This control is an eleven position stepped attenuator, ad-

justing the channel balance in approximately .75 dB steps. The maxi-

mum attenuation is under 4 dB, so both channels will be present even

in the extreme positions. In normal use the control will be centered.

LEVEL: The Premier Ten volume control is a twenty-three position

stepped attenuator, selecting among twenty-three pairs of precision

resistors for each channel.

Premier Ten Owner’s Manual 6

VACUUM TUBE REPLACEMENT

The Premier Ten uses four vacuum tubes, all 6GK5s. This type has

beencarefully chosenfor itsparticular circuitapplication. Itis wellknown

that tubes of a given type vary sonically depending on the manufacturer.

We have chosen the brands of tubes we supply based on extensive

auditioning of available brands with the choices being made solely on

the basis of sonic performance without regard for either cost or prestige.

We know of no vacuum tubes available which will improve the sonic

performance of your Premier Ten. In addition, the tubes in your pream-

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

permits them to perform for a greatly extended period without sonic

degradation. We anticipate two to three years of operation without

degradation in normal use. The tubes have also been hand selected to

achieve the minimum residual noise in your preamplifier. Therefore, we

highly recommend that you purchase replacement tube sets from

conrad-johnson design.

Premier Ten Owner’s Manual 7

GETTING THE MOST FROM YOUR PREMIER

TEN

The conrad-johnson Premier Ten offers an unparalleled level of sophis-

tication and refinement in music reproduction, but it cannot transform an

inferior stereo system. Only high quality amplifiers and loudspeaker

systems will be capable of fully revealing the capabilities of this preci-

sion instrument.

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 almost exclu-

sively 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 pres-

sure). 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

inthe stereo systemis either phasecorrect or phaseinverting (including

the source and speakers-these are normally phase correct). It is of no

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).

THE PREMIER TEN IS PHASE INVERTING. If your system has an odd

number of inversions, then you must add one phase inversion. This will

be the case if the Premier Ten is the only unit in the chain that inverts

phase. THIS IS CONVENIENTLY DONE BY REVERSING THE POSI-

TIVE 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

Premier Ten Owner’s Manual 8

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.

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

choiceof interconnects will be systemdependent- those that areranked

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

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

cific system.

TIP

WarmupthePremierTenbefore listening:Thesonicperformanceofthe

Premier Ten improves noticeably as the unit warms up. The midrange

becomesmore lucid, thehighs smoother, andthe soundstage expands.

The warm up period can be expected to last several minutes.

Questions: If you have questions about the installation or function of

your Premier Ten do not hesitate to call Customer Service at (703)

698-8581.

Premier Ten Owner’s Manual 9

Premier Ten SPECIFICATIONS

Gain: 25dB

Maximum Output: 20V

Bandpass: 2Hz to more than 100kHz

Hum and noise: 94dB below 2.5V output

Distortion at 1.0 v output: less than .5% THD or IMD

Phase: inverts phase of all inputs at main out

Ouput impedance: less than 200 ohms

Mechanical:

Dimensions: : 19"W x 5.25"H x 16 3/8"D

Net Weight: 28 lbs.

Premier Ten Owner’s Manual 10

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