Conrad-Johnson Premier Four Bedienungsanleitung

OWNER'S MANUAL

PREMIER FOUR

VACUUM TUBE POWER AMPLIFIER

conrad-johnson design, inc.

703-698-8581

Thank you for your considered purchase of a conrad-johnson Premier Four amplifier.

In it, you have acquired one of the finest pieces of music reproduction equipment

available today.

The Premier Four amplifier was designed for the purpose of providing ourselves (and

other members of the community of designers of high fidelity audio equipment) with

a reference quality amplifier. Its unique circuit design embodies the results of 10

man-years of research into the technology of the reproduction of recorded music. The

design has been uncompromisingly executed in the finest available component parts

and each unit painstakingly assembled and tested to insure enduring sonic excellence

and trouble-free operation.

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

features and capabilities of your Premier Four.

LIMITED WARRANTY FOR THE conrad-johnson PREMIER FOUR

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

johnson Premier Four will perform to specifications as published in the owner's

manual and that it 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 crate 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 packing is available from the factory.

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

3. The above warranty may be transferred to subsequent owners provided 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 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 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 limitations on how long an implied warranty lasts, so

the above limitation or exclusion may not apply to you.

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

2733 Merrilee Drive

Fairfax, VA 22031

ph: 703-698-8581

CIRCUIT DESIGN

It has been our experience that simple designs with few active stages when executed

with care and great attention to detail will be both more musical and more reliable

than overcomplicated alternatives. Accordingly, the audio circuit of the Premier Four

is remarkably straight-forward. A single triode input amplifier is direct coupled to a

cathode follower. This arrangement offers exceptional phase linearity. This stage is

direct coupled to a cathode coupled differential phase inverter using high current

triodes to provide balanced, low impedance drive to the push-pull output stage. The

output stage utilizes paralleled EL34s - a total of four per channel. This stage features

ultralinear operation which permits high power levels while greatly reducing the

source impedance of the stage. As a result, the amplifier is capable of supplying the

large current demands of high amplitude musical transients driven into reactive

speaker loads. A substantial main power supply of nearly 2,000 microfarads at more

than 500 volts enables the Premier Four to easily meet these extraordinary current

demands. The supplies for the two channels are separated after the input condenser to

reduce cross coupling of the stereo channels to negligible levels. Separate voltage

regulators for the voltage amplifiers and phase inverters provide nearly absolute

isolation of these sensitive stages from the output stage.

INSTALLATION

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

considerable heat (approximately 250 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 un-obstructed. 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 Four 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 the Premier Four 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 FOUR IS TO BE OPERATED ONLY ON AC LINE VOLTAGE

OF 108 TO 125 VOLTS

(Also available wired for 100 volt or 230 volt, 50/60 Hz).

CONNECTION

Input:

Connect the left and right outputs from the preamplifier to the amplifier inputs.

Output:

The speaker wires will be connected to the amplifier's output terminals with one wire

connected to the screw terminal marked C and the other to the 4, 8, or 16 ohm screw

terminal. Proper connection of the speakers is critical for achieving optimum

performance. There are three criteria for correct connection:

1. Correct Relative Phase: The two channels must be wired in phase. This means

that when the same signal is applied to both channels, the right and left channel

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 taking care to connect the wire from the amplifier

terminal marked C on each channel to the same coded terminal on each speaker.

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

preamplifier mode switch in 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 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.

2. Correct Absolute Phase: Musical transients are positive going - that is they

first create a pressure front in the surrounding air. It is important that your stereo

system reproduces transients in the same way since the ear can distinguish

between positive and negative transients. This means that on a transient the

speaker diaphragms should first move toward the listener - creating a pressure

front.

Each component in your system is either phase correct (non-inverting) or phase

inverting. If you know the phase of each component in your system (your

Premier Four is phase correct) then correct absolute phase is obtained by the

following simple rule:

THE TOTAL NUMBER OF PHASE INVERSIONS IN THE SIGNAL PATH

SHOULD BE EVEN.

If the number of phase inverting components is either none, or even, then simply

wire the speakers in a phase correct manner (amplifier C to speaker "-", amplifier

4, 8, or 16 to speaker "+".)

If the number of phase inverting components is odd, then one more inversion

should be added. This may either be accomplished at the speaker by wiring

amplifier C to speaker "+" and 4, 8, or 16 to speaker "-" or by reversing the

positive and ground leads of the cartridge. The latter method is preferable if one

inversion occurs in either your pre-preamplifier (the HV-1 is inverting) or in your

preamplifier phono stage (but not both). Making the correction at the cartridge

will then permit phase correct tape recording and playback.

If you do not know the phase of each component in your system, try listening

with your speakers hooked up both ways. When correctly phased, plucked strings

and other sharp transients will sound noticeably better defined.

3. Impedance Matching - Matching the rated nominal impedance of your

speakers with the amplifier output taps will not necessarily guarantee optimum

performance. The sound with a given set of speakers will vary with the different

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

match for your speakers.

Tube locations:

Tube complement:

V1, V2 5751

V3, V4 6FQ7/6CG7

V5 - V12 EL34

V1 V2

V3 V4

V5 V7

V9 V11

V6 V8

V10 V12

TUBE REPLACEMENTS

The Premier Four uses twelve vacuum tubes of three different types: two 5751 (V1

and V2), two 6FQ7 (V3 and V4) and eight EL34s (V5 through V12). Each type has

been carefully chosen for its 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 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 Four. Also, the tubes in

your amplifier have been tempered by a controlled burn-in procedure that permits

them to perform for a greatly extended period without sonic degradation. We

anticipate one to two years of operation 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 Four 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 Premier Four has built in bias

indicators so that no instruments are required to make this adjustment.

ADJUSTING OUTPUT TUBE BIAS

Biasing the amplifier is a simple procedure that can readily be done by the owner.

Only a screwdriver is required. 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 fully down. Turn amplifier on. After about one minute, turn each of the eight

screwdriver adjustable controls 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 farther in the clockwise direction once the LED has

come on.

After the amplifier has warmed up for 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 also after each six months of average use.

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 a more serious problem, so the

unit should be taken to a qualified service center. IN NO EVENT SHOULD THE

FUSE BE REPLACED WITH A FUSE OF DIFFERENT TYPE OR RATING

THAN THAT SUPPLIED BY THE FACTORY.

The power supplies to the output stages are fused to prevent damage to the amplifier

in the event of failure of an output tube. When one of these fuses opens the

corresponding channel will be dead. An LED adjacent to the fuseholder will light to

indicate a blown fuse.

Fuses: ac line - 10 amp slow blow

output stage - KTK2 (2 amp fast blow)

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