Conrad-johnson design PREMIER SEVEN Bedienungsanleitung

Congratulations on your purchase of the conrad-johnson Premier Seven

vacuum tube preamplifier. You have acquired one of the finest pieces of

musical reproduction equipment available today. The result of a decade

of research by conrad-johnson design into the application of vacuum

tube devices to the reproduction of recorded music, the Premier Seven

was designed to establish the reference standard among preamplifiers

for reproducing the dynamics, tonalities, 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 Seven. NOTE

THAT THE Premier Seven LINE STAGE IS PHASE INVERTING. See

the section entitled "Getting the most from your Premier Seven" for

details on correct hookup in your system.

LIMITED WARRANTY FOR THE conrad-johnson Premier

Seven

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

Premier Seven will be free of defects in materials 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

registeredownerprovidesthefactory withasigned noticegivingthe 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 limitations or

exclusions may not apply to you.

Premier Seven 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

Pleasereturnthe enclosedcardtothe factorywithin30days of purchase

toregister thewarranty.Thewarrantymay betransferredto anewowner

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

sendsasignednotice providing the name and address ofthenewowner

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 Seven Owner’s Manual 3

INSTALLATION

Because of the number and type of vacuum tubes used, the Premier

Seven dissipates a significant amount of heat (approximately 50 watts).

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 three 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 Seven requires an ac power line providing between 108

and 125 volts at 50 to 60 Hz. Alternatively, the Premier Seven is

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

CONNECTION

Phono input: This input provides the amplification and equalization

required by moving magnet and most moving coil cartridges. The phono

input impedance can be selected by a back panel switch. The options

are70,100,150,250,470,1k,2k,5k,10kand47kohms.Mostmovingmag-

net cartridges will sound best at the industry standard 47k setting,

though some may benefit from loading at 10k. Moving coil cartridges are

more variable, and we recommend auditioning the system to choose the

load most suitable for your cartridge.

Tuner, cd, tape 1, tape 2: These are high level inputs and are electri-

callyequivalent.They presenta20kohm loadtothesource. The outputs

of your tape recorders should be connected to tape 1 and tape 2.

Record output:The record outputs connect the selected signal to your

recorders or external processing loop (eg. equalizer). The output signal

is not affected by the level control. Connect "record out" to the inputs of

your tape recorders or external processors.

Output 1, Output 2: Connect these outputs to the input of your ampli-

fier(or crossover in a bi-amped system). We recommend the use of an

amplifier with an input impedance of 10k ohms or higher. Since the line

Premier Seven Owner’s Manual 4

stage of the Premier Seven 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 Seven" for an explanation of

this.

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

usetheRecordSelectortoselectphono,tuner,cdortape1.Byselecting

the input directly on the source selector, the tone control processor will

be bypassed.

Premier Seven 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. The relay grounds the outputs again immediately at

turn off or in the event of any power line interruption.

SOURCE SELECTOR: PHONO, TUNER, CD, TAPE 1, TAPE 2: This

selector switch is used to choose an input for listening.

RECORD SELECTOR: PHONO, 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. Note that when Tape 1 or

Tape 2 is selected on the record selector, that tape deck’s output is fed

back to its own record input-CARE MUST BE TAKEN NOT TO SELECT

TAPE 1 OR TAPE 2 WHILE THE TAPE DECK IN QUESTION IS IN

RECORD MODE. Similarly, if tape loop 2 is used for an external signal

processor, Tape 2 should never be selected on the Record Selector

(and, of course, there is no reason to select it since the external

processor is not itself a program source). Failure to observe these

precautions will create an unstable feedback system and may generate

a "howling" sound.

LEVEL: The Premier Seven volume controls are twenty-three position

stepped attenuators, selecting among twenty-three pairs of precision

resistors. A front panel LED lights to display the selected attenuation.

Premier Seven Owner’s Manual 6

VACUUM TUBE REPLACEMENT

Each channel of the Premier Seven uses six vacuum tubes-one 6CW4

and 5 6GK5s. Each type has been carefully chosen for its particular

circuit application. It is well known 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

Seven. In addition, 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. 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 when the time

comes to replace the vacuum tubes, you purchase replacement tube

sets from conrad-johnson design.

To gain access to the tubes in the right (lower) channel, remove the top

four screws in each side panel and the upper four screws in the

faceplate. This will allow you to remove the left (upper) channel chassis

and will expose the top cover of the right channel chassis. Removal of

this cover will expose the tubes.

NOTE: Be careful not to bend or otherwise displace the row of LEDs on

the front of the chassis as they need to be carefully realigned with their

respective holes in the faceplate when the upper chassis is reinstalled.

There are no tubes in either power supply chassis.

Premier Seven Owner’s Manual 7

GETTING THE MOST FROM YOUR PREMIER

SEVEN

The conrad-johnson Premier Seven offers an unparalleled level of

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

form an inferior stereo system. Only high quality amplifiers and loud-

speaker systems will be capable of fully revealing the capabilities of this

precision 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 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 loudspeak-

ers. 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 source

andspeakers-theseare normallyphasecorrect). It isofno 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 Seven 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 Seven 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 Seven Owner’s Manual 8

moresharply defined.The effectisespeciallyapparentonpluckedstring

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.

AC LINE POLARITY

Each piece of electronic equipment in your system is subject to minute

ac leakage currents to the chassis. Since the chassis of components in

a system are usually connected via the ground side of the interconnect

wires, these leakage currents are superimposed on the musical signals.

It is possible to minimize these current flows by carefully selecting the

way in which each component is plugged into the wall outlet. Because

the power cords on the Premier Seven are not polarized, each can be

plugged in two ways. It will normally sound better in one orientation than

in the others. The same will be true of any electronic device in your

system.

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

choice of interconnects will be system dependent- those that are ranked

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

Consult your conrad- johnson dealer for recommendations for your

specific system.

TIP

Warm up the Premier Seven before listening: The sonic performance of

the Premier Seven 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 several minutes.

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

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

698-8581.

Premier Seven Owner’s Manual 9

Premier Seven SPECIFICATIONS

Phono Section:

Gain: Phono stage 40dB

Phase: Phono stage phase correct (non inverting)

Phono overload: in excess of 150 mv at 1KHz

RIAA equalization: to +/- .25dB (20Hz-20KHz)

Hum and noise (20Hz-20KHz): 80dB below 10mv input

Line Level Section:

Gain: 29dB

Maximum Output: 20V

Bandpass: 2Hz to more than 100kHz

Hum and noise: 88dB below 2.5V output

Distortion at 1.0 v output: less than .25% THD or IMD

Phase: line section inverts phase of all inputs (including phono) at

main out

Ouput impedance: less than 200 ohms

Mechanical:

Dimensions: Audio chassis: 19"W x 7"H x 16 3/8"D

Power supply: 19"W x 3.5"H x 16"D

Net Weight: 60 lbs.

Premier Seven Owner’s Manual 10

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