Precision Power MA1250 Manuale utente

OWNERS MANUAL MA1250

Congratulations Endpanel Layout

Features & Specifications Endpanel Layout

Installation Troubleshooting

Wiring Troubleshooting

Power / Ground Troubleshooting

Connections Troubleshooting

Connections System Diagrams

Inputs & Connections Block diagram

Inputs Warranty

CONTENTS

(click on a topic to view)

FOR YOUR RECORDS

The extended use of a high powered audio system may result in hearing

loss or damage. While TUBE DRIVER systems are capable of

"Concert

Level"

volumes with incredible accuracy, they are also designed for you to

enjoy at more reasonable levels all of the sonic subtleties created by

musicians. Please observe all local sound ordinances.

ThankyouforchoosingTUBE DRIVER.TubeDriversmusicalityandabsolutesonic

transparency allow accurate reproduction of recorded music enabling you to hear

as well as feel the music the way the artist intended. These handcrafted amplifiers

feature full differential “front ends” based upon a true instrumentation amplifier

topology. Tube Drivers utilize only the highest quality Svetlana tubes in our unique

configurations.Alloftheinternal amplifier stages havebeen designed to haveultra-

wide bandwidth together with a high degree of linearity. The tubes used in these

amplifiers provide both voltage gain and current gain where they are connected in

Cascode and Cathode Follower configurations. D.C. servos are used to control any

D.C. offset. These servos are critically positioned in the circuit so that not only is

D.C. offset eliminated but also any subtle differences between tubes are internally

compensated. These tube stages are then connected to a high current BiPolar

output stage that uses the same audiophile quality Sanken output devices featured

in the PrecisionPower 2500F1.The output stages receive their power from a highly

regulated D.C. power supply which enhances their performance significantly. Very

littlenegativefeedbackisused.Lowfeedbackdesignshavegreatly improved sound

quality having an extremely warm and open sound with enhanced musicality

consistent with only the highest quality home tube amplifiers.

Model

Serial Number

Purchase Date

Donotattempt to serviceTUBE DRIVER

productsyourself.Performingexploratory

surgery on your audio equipment yourself will void the warranty. Many parts of your

TUBE DRIVER gear are custom built to our specifications. Our factory parts are not

made available to anyone else nor are they for sale. Our goal is to make sure that

your TUBE DRIVER product will always sound as good as the day it was

purchased.Contact your authorized TUBE DRIVER dealer about obtaining any

warranty service through TUBE DRIVER. (See Warranty inside back cover)

Caution!

Service

BACKTO CONTENTS

Fully regulated adaptive MosFET power supply

Balanced Mini-Din Input

High Voltage Input Capability with Input Attenuation Switch

Gold Plated RCA Input connectors

Three Year Warranty when installed by anAuthorized

dealer

Completely Designed and Handcrafted in the USA

Features

Power Bandwidth: 5 Hz -50 KHz

Total Harmonic Distortion: 0.2% or less (A-weighted)

Input Topology: Balanced Differential

Input Sensitivity: 500mV - 12 volts RMS

Input Impedance: 10K Ohms

Output Impedance: 2 - 16 Ohms

MA1250

250 WRMS x 1 @ 4 Ohms

500 WRMS x 1 @ 2 Ohms

Dimensions

Length = 17”

Height = 3.2”

Width = 9.25”

Specifications

Continuous Output Power

MA1250

BACKTO CONTENTS

Recommended Fuse Rating for MA1250 is 100 Amps

You will need to install an in-line fuse or circuit breaker in the power wire

within 18” of the battery. This fuse or circuit breaker protects your vehicle

from fire in case the power wire shorts to the vehicle body.If you areonlyusing

one amplifier, use the recommended fuse rating. If you are using more than one

amplifier, add up the fuse ratings for all amplifiers, and use this sum for your main

fuse or circuit breaker. Use a power distribution block or fuse near your amplifiers

with the appropriate fuse for each individual power wire.

The information below is a basic formula you can use to determine approximate

current draw. A 50% amplifier efficiency rating is used as an average. This formula

isonlyaguideline.Usingwireofalargergaugecanonlyimprovethecurrenttransfer

of your system. Do not use smaller gauge wire.

Total 4-Ohm rated RMS output x 2 =Total InputWattage

Total Input Wattage/Supply Voltage = Current Draw (in Amps)

Example:

Your

MA1250

has 1 channel at 250 watts RMS into 4-Ohms

(250 x 2 =500). You would use the formula below:

250W x 2 = 500W/12.5V = 40 AmpsTotal Current Draw

Fuse Requirements

Tools/Parts Needed for Installation (not supplied)

Small flat blade screwdriver

Phillips screwdriver (#2 or medium sized)

Wire cutters

Wire strippers

4 – #6 round head screws, and 1 – #8 sheet metal screw

(or nut, bolt, and star washer)

2 – Ring connectors (large enough to accommodate your method of grounding)

In-line fuse or circuit breaker — see fuse requirements below

Power and groundwire — see Power Wire Calculator on the next page

Speaker wire — 16 gauge or larger

Grommets (sized to work with the power wire you plan to use in your installa-

tion)

Tube of silicone sealant

BACKTO CONTENTS

Warning!

Amplifiers Generate Heat!

You can mount the

MA1250

in any position, even upside-down. However, you

mustmaintain properairflow.Do notinstallyour

MA1250

undercarpetsorenclose

it behind airtight panels. In trunk-mounted applications, be sure to provide venting

for air circulation. Let the amplifier breathe. Without adequate air circulation, your

Tube Driver will turn itself down to protect itself.

Power Wire Calculator

Mounting

You need to mount your

MA1250

securely in your vehicle to prevent damage. You

may mount the system right-side up, on its side, or upside-down, provided there is

adequate ventilation.

Recommended MINIMUM Gauge

20 - 35 12 10 8 8 6 6 8 4

0 - 20 14 12 12 10 10 8 8 8

35 - 50 10 8 8 6 6 4 4 4

50 - 65 8 8 6 4 4 4 4 2

65 - 85 6 6 4 4 2 2 2 0

85 - 105 6 6 4 2 2 2 2 0

105 - 125 4 4 4 2 2 0 0 0

125 - 150 2 2 2 2 0 0 0 0

Total Current Draw Length of Wire to Run (in Feet)

(in Amps) < 3 4 - 7 7 - 10 10 - 13 13-16 16-19 19-22 22-28

BACKTO CONTENTS

Warning!

To prevent a short to ground, disconnect the negative (-) terminal of the system’s

battery before you begin. If the power cable shorts to ground, current will continue

to flow until the short is opened, the main fuse blows, the battery explodes, or the

wire melts.

Reconnect the terminal only after you make all connections.

Grounding

Your

MA1250

is designed to operate from a car’s positive 12 volt, negative ground

electrical system. The ground wire should be the same gauge as the power wire

indicated in the chart.

The main power cable should run from the amplifier location, through or under the

vehicle,to the battery.Youmustuse a grommet whereverthe cable passes through

a steel panel to prevent an eventual short to ground.

The ground connection is the most important part of any installation. If the

connections are poor and/or the resistance is high, the resulting drops in voltage

will rob you of amplifier power and may allow noise to enter your system. Your new

Tube Driver features a fully regulated power supply. It will make full power even if

thevoltage changes. Itwill draw more current at lower voltages to make that power.

Lower voltage and high cable resistance means more total current draw. Using a

digitalmultimeter(DMM),try to get cable resistanceaslowas possible. If resistance

is too high, use a larger gauge wire. Try to ground your system to a single point in

thevehicle.Inlargersystems,usedistribution blocks and run bothpowerandground

cables directly to the system battery.

Remote Turn-on

IMPORTANT! Your new

MA1250

is equipped with our unique tube warm-up

circuit. When your system is turned on, The LED labeled “WARM UP” will

illuminate and full power is applied to the tube heaters for approx.35 seconds.

The internal fan will then turn on and two seconds later the amp outputs will

be switched on.The system will then play as normal.

You must connect a wire to the remote (REM) terminal (located in the speaker

terminal plug) of your amplifier to power on your

MA1250

.The source unit normally

provides a remote amp turn-on or power antenna lead that provides this +12 volts

when you turn on the unit.

• Run a wire from the chosen turn-on lead to the REM connection

of your

MA1250

(See Endpanel Layout: Page 10)

• Tighten the connection

BACKTO CONTENTS

Follow these simple instructions and refer to the diagram below to

make your speaker connections:

•Using at least 16 gauge wire, run wire from the speakers to the

amplifier(s) using the same precautions that you followed for

running the power, ground, and remote wires

• Cut off excess wire

• Use wire strippers to strip 1/4 inch of insulation at the end of

the wires

• Attach the speaker wires to the amplifier’s

POWERLOCK

connector and plug

it in

Speaker Connections

Powerlock

Connector

BACKTO CONTENTS

Connections

All multi-channel TUBE DRIVERS are capable of being bridged into a 4-Ohm

mono output without switches or bridging modules.

Your new

MA1250

is a mono (single channel) amplifier. It cannot be bridged. The

two pairs of speaker terminals are in parallel, so connecting two 4 ohm woofers

(one on each pair of terminals) would result in a 2 ohm load to the amplifier.

Note: A total impedance of less than 2-ohms may trigger the protection

circuitry causing reduced output and may eventually damage your amplifier.

Bridging

(Two four ohm subwoofers connected in parallel = two ohm load on the amplifier.)

BACKTO CONTENTS

Input Jacks

The

MA1250

includesbothRCAandMini-Din (balanced) inputs.ThesuppliedRCA

connections allow you to use the

MA1250

with other brands of audio gear.

Our

Differential RCA inputs provide a dramatic improvement in noise reduction over

standard RCA input types.Our fully balanced Mini-DIN connection system features

high signal voltage capability and the highest possible sound quality.A single cable

for2 channels alsosimplifies installation.

Cablesfromthe source unit, non-powered

equalizer, or crossover go here. Both left and right inputs should be used for

maximum amplifier output.

Standard Coaxial RCA Cables

Standard coaxial RCA cables utilize two connections: a center wire (signal positive)

attachedtothecenterpin of the RCA connector along withabraidedouterconductor

(signal negative) connected to the outer ring of the RCA connector. This design

almost always allows radiated noise to enter the system, since the signal is not well

protected.

Balanced Mini-DIN Cable

Balanced Mini-Din connections use six pins and one grounding ring. Pins 1 and 2

are open connections, normally they would carry your remote turn on voltage. Pins

3/4 and 5/6 are a pair of twisted conductors for the music signal. The twisting of the

inner wires rejects or eliminates radiated noise by more than 30 dB. The inner pair

of wires are then protected by an outer shield connected to Pin 1. This means the

music signals can be kept as far away as possible from the power and chassis

ground paths of other circuitry, allowing the transmission of pure music between

points while protecting it from noise generating equipment and wiring present in the

vehicle. Thediagrambelowshowsthepinconfiguration for the Mini-Din connections.

Balanced Inputs

BACKTO CONTENTS

Input Gain Control

There is an Input Gain Control located on the end panel under the RCA input jacks.

This is not a volume control! Thiscontrolmatches the outputsignal voltage ofthe

source unit to the amplifier inputs.

By turning the control clockwise (to the right), the inputs of the amplifier become

more sensitive and will allow a weak signal of approximately 1/2 volt to drive the

amplifier to full power. At the same time, while an amplifier with its level control at

maximum is able to drive a weak signal, it also picks up and amplifies any noises

lurking in the background, such as a brake light

pop,

alternator

whine,

or ignition

tick.

Increasing the signal voltage to the amplifier by using a high output source unit (or

a TUBE DRIVER LD-3) makes the music much louder. By turning the level control

counterclockwise (to the left), the amp inputs will be less sensitive. The amp will

reproducemusicatfullpowerwhilemaking anynoisefloorinsignificant.Your

MA1250

accepts signal levels of up to 12 volts RMS.

Setting Input Gain

1. Set the Input Gain Control to just above the lowest setting.

2. Turn the master volume on the source unit or pre-amp to almost full volume.

3. With music playing, slowly increase each Input Gain Control until you hear

distortion. Turn down the Gain Control until the distortion stops.

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