Conrad-Johnson PV10A Manual de usuario

Thank you for selecting the PV10A as the control center for your audio

system. The PV10A draws on two decades of research at conrad-

johnson into the reproduction of recorded music. The result is a line-

stage preamplifier with a remarkable ability to recreate the the

dynamics, textures, tonalities, and ambience of live musical perform-

ances. With the PV10A, we believe that you will experience the excite-

ment of discovery in hearing more from your favorite recordings than

ever before.

Atconrad-johnson,weexpectourproductstobeasourceofsatisfaction

and of pride to their owners for many years to come. Accordingly, circuit

designs, parts and materials for all conrad- johnson products are se-

lected with a view to maintaining optimal performance over the years.

Our reputation for producing among the industry’s most reliable compo-

nents is a natural consequence of this engineering approach.

Although the PV10A has been designed to operate in an intuitively

apparent way, you will find useful information on it’s installation and

operation in this manual. Please take a few minutes to read the manual

to better understand the features and capabilities of your PV10A. Note

that the line-stage section of this unit is phase inverting. See the section

entitled "Getting The Most From Your PV10A" for details on correct

hookup in your system.

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

owners. We want you to enjoy your conrad-johnson product to the

fullest. To this end, our staff stands ready to answer any questions you

may have about the function and application of your PV10A, and to

provide any needed service both during, and after the warranty period.

Our goal is to heighten your enjoyment of recorded music.

PV10A Owner’s Manual 1

Limited 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 original pur-

chaser, or five years from the date of shipment to the authorized

conrad-johnson dealer. During the warranty period, conrad-johnson will

repair defective units without charge for labor or parts (with the excep-

tion of vacuum tubes and batteries).

Exclusions. The following are not covered under this warranty:

a) Units which have been damaged by misuse, abuse, or accident.

b) Units which have been modified, altered, or improperly repaired 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 incidental 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 packing 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 par-

ticular purpose are limited in duration to the duration of this p73 express

warranty. Some states do not allow limitations on the duration 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.

Conrad-Johnson products purchased outside the United States are

covered by warranty terms of the importing distributor in the country in

which the product was originally purchased, which may differ from the

terms set out herein. Importing distributors are not obligated to provide

warranty service for products originally purchased outside their country.

Conrad-Johnson will provide warranty service for products outside the

PV10A Owner’s Manual 2

United States, but the customer 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 Service Department can also be reached 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 ob-

tained from our service department for a nominal charge, 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.Beawarethatrequestinganestimatewilldelayservicetoyourunit

as we will have to contact you for your approval before commencing

service.

Registering The Warranty

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

chase to register the warranty.

PV10A Owner’s Manual 3

Installation

The PV10A dissipates up to 35 watts of heat, and must be adequately

ventilated. Mount the unit 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. Vertical installation is not recommended.

All PV10As sold in the United States are configured for operation on a

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

versions 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 PV10A to

minimize it’s susceptibility to radio frequency interference and other

forms of EMI. Choice of materials, physical layout, grounding practice,

andpower supply design haveall been specified witha view to reducing

the impact of electromagnetic fields on the performance of this unit. At

the same time, however, our primary goal is the accurate reproduction

of recorded music in the normal home environment, and we have

elected not to compromise this objective by the application of heavy-

handed RFI filters, or by using grounding practices that reduce RFI at

theexpense of degraded audioperformance. We find thatthe approach

we have taken has worked extremely well, resulting in only rare in-

stances of EMI problems which could be treated locally as needed,

rather than compromising the performance of our product in the 99.9%

of installations where EMI is not a problem.

CareininstallationcanoftenavoidEMIinducedproblems.Thefollowing

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).

PV10A Owner’s Manual 4

Physical location and cable "dress" can be an important factor in

minimizing hum pickup. The installation should situate the preamplifier

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

be dressed to remain at least 4" (100mm) away from input/output

cables.

Connection

AUX1/PH: On a PV10AL, this is an additional line-level input, and is

identical to the other inputs. On a PV1OA with phono stage, this input

provides the amplification and equalization required by moving magnet

and high output moving coil cartridges. The phono input impedance is

the industry standard 47,000 ohms shunted by approximately 100 pico-

farads capacitance. This is well suited to nearly all moving magnet and

many high-output moving coil cartridges. If necessary, the input imped-

ance can be lowered by soldering a resistor across ( from center pin to

ground) the input jack. To achieve a desired input resistance of RD, use

the following formula to compute the required additional resistance RA:

RA = (47000 x RD)/(47000-RD)

Some moving magnet cartridges require higher capacitance for opti-

mum performance. Increasing the input capacitance may be achieved

by soldering a suitable value capacitor across the phono input jack. Use

polystyrene capacitors for this purpose.

TUNER, CD, VIDEO, AUX2, TAPE IN: These are high level inputs and

are electrically equivalent. They present a 50k ohm load to the source.

The outputs of your tape recorders should be connected to "TAPE IN".

TAPEOUT: This output connects the selected signal to your recorder or

external processing loop (eg. equalizer). The output signal is not af-

fected by the level control. Connect "TAPE OUT" to the inputs of your

tape recorder or external processor.

MAIN OUT: Connect this output to the input of your amplifier(or cross-

over in a bi-amped system). We recommend the use of an amplifier with

an input impedance of 10k ohms or higher. Since the PV10A inverts

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

correct phase. See the section on "Getting the most out of your PV10A"

for an explanation of this.

PV10A Owner’s Manual 5

EXTERNAL TONE CONTROLS OR OTHER SIGNAL PROCESSING

DEVICES: Connect the output from your processor to the TAPE IN

input, and the input of your processor to the TAPE OUT output on the

PV10A. The TAPE MON position of the SOURCE/TAPE MON button

will insert the processor into the circuit; the SOURCE position will

provide flat, unprocessed response.

PV10A Owner’s Manual 6

CONTROLS

OFF, ON: Because of the delayed warmup characteristics of vacuum

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

preamplifier. The MAIN OUT connections are grounded via a relay for

approximately90secondsafterthe unit is turned oninordertosuppress

warm-up transient noises. The relay grounds the outputs again immedi-

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

SELECTOR: This switch is used to choose among AUX1/PHONO,

TUNER, CD, VIDEO, and AUX2 inputs. The selected source will be

available at the source position of the tape monitor switch and at the

TAPE OUT output connection.

SOURCE/TAPE MONITOR: Tape monitoring is accomplished via a

pushbutton control. The button, labeled SOURCE/TAPE MON, lets you

select your tape deck as an input source, and is also used to compare

the original program source with the playback from the chosen tape

deck while recording from AUX1/PHONO, TUNER, CD, VIDEO or

AUX2. inputs.

LEVEL: The PV10A volume control is a precise control, maintaining

channel to channel accuracy to within 1 dB throughout most of its

rotation.

PV10A Owner’s Manual 7

Vacuum Tube Replacement

The audio circuit of the PV10A uses five vacuum tubes of three different

types: two 12AX7 (V1 and V2), one 12AT7 (V3) and two 12AU7 (V4 and

V5). The PV10AL uses two type 12AU7 (V4 and V5). The brands of

tubeswesupply have been chosenbyfirstselecting 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 PV10A. 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, then selected for minimum residual noise. Replacement

tubes are prepared and selected 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 operation

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.

Tube Chart:

V3 V4 V5

PV10A Owner’s Manual 8

Getting The Most From Your PV10A

In a system of commensurate high quality components, the conrad-

johnson PV10A offers a remarkable level of sophistication and refine-

ment in music reproduction. To get the best performance out of any

audio system, there are 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

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 inverting. 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 inversions is

even (or zero).

The line stage of the PV10A is phase inverting. If your system has an

odd number of inversions, (for example, if the PV10A is the only phase

inverting unit in the chain) 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.

PV10A Owner’s Manual 9

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 little better than

average. To complicate matters, our experience suggests that the

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

ranked on one system may be a poor choice for a different system.

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

cific system.

Performance Tip

Warm up the PV10A before listening: The sonic performance improves

noticeablyastheunitwarms up.Themidrangebecomesmorelucid,the

highs smoother, and the soundstage expands. The warm up period can

be expected to last about fifteen minutes.

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

your PV10A do not hesitate to call Customer Service at (703) 698-8581.

PV10A Owner’s Manual 10

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