Conrad-Johnson TEA2 Bedienungsanleitung

Conrad-Johnson Owner’s Manual:

TEA2 Phono Preamplifier

conrad-johnson It just sounds right.

TEA2 Owner’s Manual 1

Thank you for selecting the conrad-johnson TEA2 triode equaliza-

tion amplifier as the phono stage for your audio system. The TEA2

is capable of remarkably faithful recreation of the dynamics, tex-

tures, tonalities, and ambience of live musical performances. We

believe that you will experience the excitement of discovery in

hearing more from your favorite LPs than ever before.

At conrad-johnson, we expect our products to be a source of satis-

faction and of pride to their owners for many years to come. Ac-

cordingly, circuit designs, parts and materials for all conrad-

johnson products are selected with a view to maintaining optimal

performance over the years. Our reputation for producing among

the industry’s most reliable components is a natural consequence

of this engineering approach.

Please take a few minutes to read the manual to better understand

the features and capabilities of your TEA2. Note that the TEA2 is

available in two different versions –High Gain and Low Gain. See

the first section of this manual, “The TEA2 Family of Phono

Stages” for guidance in choosing the correct version for your appli-

cation.

In closing, we’d like to welcome you to the family of conrad-

johnson owners. We want you to enjoy your conrad-johnson prod-

uct to the fullest. To this end, our staff stands ready to answer any

questions you may have about the function and application of your

TEA2, and to provide any needed service both during, and after

the warranty period. Our goal is to heighten your enjoyment of re-

corded music.

TEA2 Owner’s Manual 2

he TEA2Family of Phono Stages

The TEA2 is available in High Gain and Low Gain versions. Both

versions share a common circuit approach featuring a zero loop

feedback circuit with passive RIAA equalization. Gain is provided

by two single ended triode stages in both versions. Both use a pair

of 12AX7s for the input stage (with the two triode sections con-

nected in parallel to minimize noise). The high gain version uses a

third 12AX7 for the second gain stage, while the low gain version

uses a 12AU7. Because these tubes are quite different, the two

versions also have different resistors associated with these tubes.

Choosing the Correct TEA2 for Your Application

With 55dB of gain, the TEA2HG high gain version is well suited to

cartridges with rated output of 1.0 mV (1000 micro Volts) or below.

It is not recommended for use with higher output cartridges, as

they may overload the circuits resulting in excessive distortion. For

cartridges with rated output above 1.0 mV, choose the low gain

TEA2LG (gain of 40 dB).

A TEA2 can be changed from HG to LG configuration and vice

versa at the factory. The change will entail replacing resistors and

the phono stage tubes. There will be a charge for parts, labor, and

return shipping for this service.

TEA2 Owner’s Manual 3

imited Warranty For Conrad-Johnson Components

Conrad-Johnson Design, Inc. will provide service under warranty to

the original owner on products sold new in the United States for the

lesser period of three years from the date of purchase by the origi-

nal purchaser, or five years from the date of shipment to the au-

thorized conrad-johnson dealer. During the warranty period, con-

rad-johnson will repair defective units without charge for labor or

parts (with the exception of vacuum tubes and batteries).

Exclusions. The following are notcovered under this warranty:

a) Units which have been damaged by misuse, abuse, or acci-

dent.

b) Units which have been modified, altered, or improperly re-

paired by anyone not specifically authorized by conrad-johnson

design, inc.

c) Units not purchased from an authorized conrad-johnson

dealer in the United States for use in the United States.

d) Normal wear

e) Incidental or consequential damages are not covered under

this warranty. Some states do not allow the exclusion of inci-

dental or consequential damages, so this exclusion may not

apply to you.

Obtaining Warranty Service: To obtain warranty service, the unit

must be shipped, along with evidence of purchase, in factory pack-

ing to conrad-johnson design (or designated service center) with

freight and insurance prepaid by the owner. After repair, the unit

will be returned with freight and insurance prepaid by conrad-

johnson design to any destination in the United States.

All implied warranties, including merchantability and fitness for a

particular purpose are limited in duration to the duration of this ex-

press warranty. Some states do not allow limitations on the dura-

tion of implied warranties so the above limitations may not apply to

you.

This warranty gives you specific legal rights and you may also

have other rights which vary from state to state.

TEA2 Owner’s Manual 4

Conrad-Johnson products purchased outside the United States are

covered by warranty terms of the importing distributor in the coun-

try in which the product was originally purchased, which may differ

from the terms set out herein. Importing distributors are not obli-

gated to provide warranty service for products originally purchased

outside their country. Conrad-Johnson will provide warranty service

for products outside the United States, but in these cases, the cus-

tomer must pay all shipping, handling and customs costs both to

and from our Service Department.

Questions about this warranty should be addressed to:

Service Department

conrad-johnson design, inc.

2733 Merrilee Drive

Fairfax, VA 22031

The conrad-johnson service department can also be reached by e-

mail at [email protected], by phone at 703-698-8581,

or by fax at 703-560-5360.

Service

If your conrad-johnson audio component requires service, repack it

using the original box and packing material and ship to the Service

Department address above. Boxes and packing materials can be

purchased through our service department if you no longer have

yours. Include with the unit a note describing the problem you are

having in as much detail as possible. It is especially important for

our technician to know if the problem is intermittent. If you want an

estimate of cost for out of warranty service, be sure to request it in

this note. Be aware that requesting an estimate will delay service

to your unit, as we will have to contact you for approval before

commencing service.

Registering The Warranty

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

purchase to register the warranty.

TEA2 Owner’s Manual 5

nstallation

Set Up

To maintain proper ventilation, mount the TEA2 horizontally on a

flat, hard surface, and take care that the ventilation holes in the

bottom are unobstructed. Allow at least two inches of clearance

above the unit and keep the cabinet or shelf open at the back.

All TEA2s sold in the United States are configured for operation on

a 60Hz ac power line producing between 108 and 126 volts. Export

versions of the TEA2 will have the correct operating voltage and

frequency clearly marked on the back panel of the unit, near the ac

power cord. In all cases, the actual line voltage should be within +

5/-10% of the nominal rated voltage.

Electromagnetic Interference (EMI)

Considerable care has been taken in the design of the TEA2 to

minimize its susceptibility to radio frequency interference and other

forms of EMI. Choice of materials, physical layout, grounding prac-

tice, and power supply design have all been specified with a view

to reducing the impact of electromagnetic fields on the perform-

ance of this unit. Our primary goal, however, is the accurate repro-

duction of recorded music in the normal home environment, and

we have elected not to compromise this objective by the applica-

tion of heavy-handed RFI filters. This approach has worked ex-

tremely well, resulting in few instances of EMI problems which can

be treated locally as needed, rather than compromising perform-

ance in the 99.9% of installations where EMI is not a problem.

Care in installation can often avoid EMI induced problems. The fol-

lowing practices should generally be observed in any application,

and will be especially important where EMI may be a problem.

Interconnect cables should be kept as short as possible (3 meters

or less), and shielded cable should be used (cable which has two

center conductors, and a separate external shield connected at

only one end).

Physical location and cable “dress” can be an important factor in

minimizing hum pickup. The installation should situate the TEA2

well away from the power amplifier, and power (ac mains) cords

should be dressed to remain at least 4" (100mm) away from in-

put/output cables.

TEA2 Owner’s Manual 6

onnection and control

Connections

Input: Connect the cables from your tone-arm to these inputs.

Note that the input impedance can be adjusted from 100 Ohms to

47 kOhms via dual-inline switches mounted on the pc board.

OUTPUT: Connect to a line-level input of your preamplifier, inte-

grated amplifier, or receiver.

Controls

<power>: Move the toggle switch labeled power to the up position

to switch the phono preamplifier on. A time delay auto-muting cir-

cuit is incorporated into the TEA2 to suppress turn-on/turn-off tran-

sients. All outputs are grounded via relays for approximately 2

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

transient noises. The muting relay also grounds the outputs imme-

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

TEA2 Owner’s Manual 7

Cartridge Loading

The TEA2 has provision for adjusting resistive loading on the input.

Loading is adjusted by the settings on a pair (one for each chan-

nel) of dual-inline (DIP) switchesmounted on the pc board near the

input connectors. Be sure to unplug the unit from the ac mains be-

fore removing cover to access these switches. The switches are

numbered from 1 to 4with switch 1 being the left-most (viewed

from the back). The TEA2 is delivered preset at the factory for an

input impedance of 47 kOhms.Loading can be adjusted as follows:

Cartridge Loading Settings on LOW GAIN Input

Resistive Load switch #

1 2 3 4

47 kOhms o o o o

9.6 kOhms x o o o

1.9 kOhms o x o o

500 Ohms o o x o

400 Ohms o x x o

200 Ohms o o o x

130 Ohms x x x x

x indicates switch in “on” position

o indicates switch in “off” position

note: the off position is indicated by an arrow on the body of the

switch array.

Be sure to use the same switch settings for both channels.

TEA2 Owner’s Manual 8

acuum Tube Replacement

The TEA2 circuit employs three twin-triode vacuum tubes –three

type 12AX7 (V1, V2 and V3) for the TEA2HG and two 12AX7s (V1

and V2) and one 12AU7 (V3) for the TEA2LG. The brands of tubes

we supply have been chosen by first selecting those brands which

are known to be most reliable, then by extensive auditioning of

these acceptable brands with the final choices being made solely

on the basis of sonic performance. We know of no vacuum tubes

available which will improve the sonic performance of your TEA2.

The tubes in your preamplifier have been tempered by a controlled

burn-in procedure that permits them to perform for a greatly ex-

tended period without sonic degradation, and then selected for

minimum residual noise. Replacement tubes are prepared and se-

lected in the same way. Therefore, we highly recommend that you

purchase replacement tube sets from conrad-johnson design.

We anticipate tube life to accommodate two to three years of op-

eration without degradation in normal use -if the preamplifier is

switched off when not in use. If the preamplifier is left on at all

times, tube life can be exhausted in a matter of a few months.

TEA2 Owner’s Manual 9

etting The Most From Your TEA2

In a system of commensurate high quality components, the

conrad-johnson TEA2 offers an unparalleled level of sophistication

and refinement in music reproduction. To get the best performance

out of any audio system, there are a number of important details

that must be attended to.

Absolute Phase

Musical notes are heard through the ear’s response to waves of al-

ternating rise and fall of air pressure. Musical transients are almost

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 tran-

sients 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 re-

spond by moving in, they create a fall in pressure and the system

is said to be phase inverting. Each component in the stereo system

either preserves the phase of the incoming signal, and is said to be

phase correct, or inverts the phase and is said to be phase invert-

ing. It is unimportant whether an individual component is phase

correct or phase inverting, as long as the system as a whole is

phase correct. This will be the case if the number of phase inver-

sions is even (or zero).

The TEA2 is phase correct (non-inverting). 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 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 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 ref-

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