Conrad-johnson design PREMIIER TWO Manuale utente

OWNER'S MANUAL

PREMIER TWO

VACUUM TUBE PREAMPLIFIER

conrad-johnson design, inc.

703-698-8581

Thank you for your considered purchase of a conrad-johnson Premier Two

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

equipment available today.

The Premier Two preamplifier 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 preamplifier. 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 Two preamplifier.

LIMITED WARRANTY FOR THE conrad-johnson PREMIER TWO

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

johnson Premier Two 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 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 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:

CONRAD JOHNSON DESIGN INC

2733 MERRILEE DR.

FAIRFAX, VA 22031

ABOUT conrad-johnson design

We are a small company offering exclusively audiophile products designed for our

own use as well as our customers'. We believe that our commitment to the purchaser

of our products is nearly unique in the industry. The services we offer to conrad-

johnson owners include:

•Information - Registered owners of conrad-johnson equipment will be directly

informed of new equipment we have to offer. They will also be informed of any

significant changes in the design of their equipment resulting from our ongoing

development program.

•Factory updating - Should significant design changes be made, conrad-johnson

design will, whenever practical, offer to update existing equipment. This service

will be offered at a minimal charge to cover parts, labor, and handling.

•Factory service - Any conrad-johnson product may be returned to the factory for

service. All equipment serviced at the factory will perform to its published

specifications when returned. Factory service will be offered at reasonable rates.

•Transferable warranty - conrad-johnson design guarantees its products, not the

owner. Should you decide to sell the product, the warranty may be transferred to

the new owner. (See Registering the Warranty.)

REGISTERING THE WARRANTY

Please return the enclosed card to the factory within 30 days of purchase to register

the warranty. The warranty may be transferred to a new 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.

CIRCUIT DESIGN

The Premier Two phono stage consists of two stages of cascode triode pairs. This

provides sufficient open loop gain to achieve optimum feedback ratios even at bass

frequencies. The second stage is direct coupled to a cathode follower which drives

the feedback loop as well as the output. Phono equalization is accomplished by R-C

networks in the feedback loop. A unique generalized anode follower configuration on

the second cascode stage tailors the circuits' open loop response to maintain a

constant feedback ratio across the audio spectrum.

The line amplifier stage uses a single triode input amplifier followed by a cascode

triode pair which maintains open loop phase linearity at high frequencies. This

cascode stage is direct coupled to a cathode follower to achieve low output

impedance.

A hybrid rectifier bridge in the plate supply controls turn-on surges to assure

maximum tube life. The plate voltage is controlled by a two stage regulator which

provides exceptional isolation from line voltage fluctuation and vanishingly small

line frequency ripple. Each stage of each channel and each cathode follower is

separately decoupled to its own 90 micro-farad capacitor with poly-propylene bypass.

Filaments are operated at a regulated d.c. voltage to eliminate coupling of subsonic

line voltage disturbances to the audio signal.

INSTALLATION

Because of the number and type of vacuum tubes used, the Premier Two 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 un-obstructed. 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.

The front panel of the Premier Two will fit in a standard 19" equipment rack and is

designed to carry the weight of the preamplifier so that the unit may be rack

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

Premier Two so that ventilation is not impeded.

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

route power cords away from input cables.

THE PREMIER TWO IS TO BE OPERATED ONLY ON AC LINE VOLTAGE OF

108 to 125 VOLTS, 50 or 60 HZ (Can be wired for operation on 100 volt or 220 volt,

50 or 60 Hz, ac lines)

In any system of audio electronics minute leakage currents from the ac line

transformers will flow in the signal ground connections between preamplifier and

amplifier. These currents can intermodulate with the signal and affect the clarity of

sound. Generally, one orientation of the line cord will provide much lower current

flows. When combined with the finest associated equipment this effect is clearly

audible with the Premier Two. After installing the unit try reversing the line cord at

the wall outlet to pick the most satisfactory orientation.

CONNECTION

Inputs:

Phono - The phono inputs provide the additional amplification and RIAA

equalization required by most high fidelity cartridges. The input impedance is 47,000

ohms shunted by approximately 100 picofarads capacitance. This is the industry

standard load and will work well with most moving magnet cartridges and all pre-

preamplifiers for moving coil cartridges. A few moving magnet cartridges perform

better with a 10,000 ohm load which may be achieved by having a service technician

shunt the phono inputs with 12,000 ohm resistors.

For some moving magnet cartridges, optimum performance requires higher

capacitive loads. This may be achieved by soldering suitable value capacitors across

the phono input jacks. Polystyrene capacitors are recommended for this purpose.

Tuner, Auxiliary, Tape 1, Tape 2 - These are all high level inputs and are

electronically equivalent. The outputs of your tape recorders should be connected to

Tape 1 and Tape 2.

Outputs:

Record 1, Record 2 - Connect these to the inputs of your tape recorders.

Output 1, Output 2 -- Connect to the inputs of amplifiers with impedance of 10k-

ohms or greater.

USE OF EXTERNAL TONE CONTROLS OR OTHER EXTERNAL SIGNAL

PROCESSING DEVICES:

Use Tape 1 and Record 1 for your tape recorder, as described in the preceding two

paragraphs. Connect the output of the tone controls to Tape 2 and the input of the

tone controls to Record 2. The Monitor 2 position of the monitor switch will insert

the tone controls in the circuit; the Source position will provide flat, unprocessed

response. This method of connection will permit the use of tone controls with tape

playback by selecting Tape 1 in conjunction with Monitor 2.

AC OUTLETS

Four ac outlets are provided for your convenience: two, marked unswitched, are

always live; the remaining two are switched by the preamp's power switch. THE

TOTAL CURRENT REQUIRED OF THE SWITCHED OUTLETS MUST NOT

EXCEED 5 AMPERES. This precludes the use of these outlets for high powered

amplifiers. It is preferable not to switch power amplifiers by the preamplifier power

switch in any case.

OPERATION

Turn on: Because of the delayed warm up characteristics of vacuum tube equipment,

a time delay muting circuit is incorporated in this preamplifier. Output 1 and Output

2 are grounded via a relay 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.

Selector: Use the selector switch to choose an input from Phono, Tuner, Tape 1,

Tape 2 or Auxiliary inputs. The selected source will be available at the source (out)

position of the tape monitor switch and at both Record Outputs. Note that dubbing

between tape decks is possible in both directions. Also, since the selected decks'

output is fed back to its own record input, care must be taken not to select a tape deck

which is in the record mode. Similarly, if one of the tape loops is used for an external

signal processor, that tape loop should never be selected (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.

Monitor Switches:Tape monitoring is accomplished via two push-button controls.

The first, labeled Tape 1/Tape 2 selects the tape deck from which you will be

monitoring. The second, labeled Source/Monitor lets you compare the original

program source with the playback from the chosen tape deck. These controls permit

the user to listen to a tape from one deck while recording material from Phono,

Tuner, or Auxiliary inputs on a second tape deck.

Mode: (the setting of this switch does not alter the signal at the record outputs)

Left - Passes the left channel input to both channel outputs

Right - Passes the right channel input to both channel outputs

Stereo - Normal stereo operation

Stereo Reverse -- Passes the left channel input to right channel output and vice

versa

Mono - Passes the sum of left and right inputs to both channel outputs

Balance:Permits continuous control of location of stereo image from left to right. In

the full counterclockwise position only the left channel will be heard. Similarly, the

full clockwise position will reproduce only the right channel. In normal use this

control will be centered.

Volume: The Premier Two volume control is an extremely precise control,

maintaining channel to channel tracking within t 1/2 db throughout its rotation.

Mute:This switch permits the user to manually trigger the relay grounding the

preamps' main outputs after the initial warm up period. This enables the user to

interrupt listening without moving the volume control setting.

Indice

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