Sonic Frontiers SONIC FRONTIERS Processor 3 Bedienungsanleitung

Operating Manual for the Sonic Frontiers Power 3 Amplifiers

We at Sonic Frontiers hope you will derive many years of listening pleasure with your

new Power 3 Amplifiers. This Operating Manual contains important information regard-

ing the operation and care of these Amplifiers. Be sure to read this manual carefully and

follow these instructions in order to keep them performing and sounding their best.

Please contact Sonic Frontiers if you have any questions - a Customer Service Represen-

tative will be pleased to assist you.

Contents

Unpacking................................................................................................................1

Quick Setup..............................................................................................................2

Reference Diagrams ..................................................................................................3

Installing the Tubes....................................................................................................5

Biasing of the Power Tubes.........................................................................................7

Controls, Functions and Connections...........................................................................8

Adjustment for Load Impedance...............................................................................10

Care and Maintenance............................................................................................12

Troubleshooting.......................................................................................................13

Warranty................................................................................................................14

Specifications..........................................................................................................15

This symbol is intended to alert the

user to the presence of uninsulated

“dangerous voltage” within the

product’s enclosure that may be of

sufficient magnitude to constitute

a risk of electric shock to persons.

This symbol is intended to alert the

user to the presence of important

operating and maintenance (servicing)

instructions in the literature accompa-

nying the appliance.

Sonic Frontiers Inc. can be reached at:

2790 Brighton Road, Oakville, Ontario, Canada L6H 5T4

Tel: (905) 829-3838 Fax: (905) 829-3033

E-Mail: [email protected] WWW: http://www.sonicfrontiers.com

10/96 SKU#56800

Unpacking

At this point we can assume that you have successfully opened the box flaps and found

this manual. These boxes were designed to ensure the safe transport of the amplifiers,

Sonic Frontiers strongly recommends the storage of these boxes in a safe, dry place. In

the event that the amplifiers may have to be shipped in the future, the original boxes are

the best means for the protection and safety of the Power 3s during transportation.

You may want to enlist a friend’s help to remove the amplifiers from the boxes, the

weight can make this awkward (hint: the back of the chassis is the heavy end). Here is a

chart listing what you will find in the box:

When unpacking the Power 3 Mono Amplifiers be sure to keep tubes grouped with the

amplifier of the same box.

If after your inspection of the contents there is a discrepancy, contact your dealer or

Sonic Frontiers immediately.

Tube Complement:

Slot Screwdriver

Phillips Screwdriver

Biasing Tool

Power Cord

Pearl Tube Coolers

(with O rings)

Cotton Gloves

Extra Fuse

Amplifier

Tube Cover

Warranty Card

Operating Manual

Power 3 (per mono channel)

8-6550C or KT88

4-6922

2-5687

1 pair

Quick Setup

At this point we urge you to read and understand this manual in its entirety. But if you

desire immediate action and have skill and/or past experience with tube hardware, fol-

low these steps.

1. Place the amp on a hard flat surface that will not impede airflow under the amplifier’s

chassis (carpeting or area rugs areNOT acceptable as hard surfaces).

2. Ensure the Power 3s are in Mute mode (this selector switch is on the rear of the

chassis). When disconnecting and connecting cable, placing the amplifier in Mute is an

excellent practice.

3. Tube bias was set at the factory prior to shipment. Tubes are also marked for their cor-

responding socket location. Carefully inspect each and install appropriately. Check

Installing the Tubes and Biasing of the Power Tubes (a must read) for further

clarification.

4. Connect your preamplifier’s left and right balanced or single-ended outputs to the left

and right inputs of the mono amplifiers.

5. Connect the speakers to the positive (+) red and negative (-) black output binding

post. Note: It is not recommended to operate any tube amplifier without

its speaker load connected.

6. Select the input for use via the selector switch: XLR-Balanced, Single-Ended Non-

Inverting, Single-Ended Inverting .

7. Power up your system turning the power amplifiers on last ensuring that both green

LEDs are on (no Standby or Mute activation). Allow 5 minutes of warm up and then play

some music.

Reference Diagrams

This drawing is referred to

as the “Tube Top” within

the instructional text.

Tube locations V1 to V4 indicate placement for the four 6922 tubes.

Tube locations V5 and V6 indicate placement for the two 5687 tubes.

Locations V7 to V14 indicate placement for the 6550C/KT88 power tubes.

AHoles on the Tube Top labeled “A” are LED indicators for the bias of the power

tubes situated nearest.

BHoles labeled “B” are the location of the bias controls. The bias controls adjust the

bias of the tube which they are joined to by the lines. Direction arrows around the

controls indicate the rotation of the control to INCREASE the bias of the power

tubes.

CPower Switch

DStandby Switch

EPower LED (Green - Power; Red - Mute)

FStandby LED (Green - Operate; Red - Standby)

GDetachable Power Cord Socket

HFuse Location

IBalanced XLR Input

JSingle-Ended RCA Non-Inverting Input

KSingle-Ended RCA Inverting Input

LInput Selector Switch

MGround Post

NLoudspeaker Binding Posts

This drawing is referred to

as the “Front Panel” within

the instructional text.

This drawing is referred to

as the “Rear Panel” within

the instructional text.

Installing the Tubes

Be sure the amplifier is OFF (Power Switch Out) before installing any tubes or when any

of the tube sockets are empty.

Wearing the cotton gloves provided with the amplifier when handling tubes will prevent

skin oils from depositing on the glass surface of the tubes. The oils could cause the tubes

to become “gassy” and fail prematurely.

Inspecting the tube boxes that come with the amplifiers (when setting up the Power 3 be

sure to keep tubes with the amplifier they were packed with), you will notice that the

boxes and power tubes themselves are labeled to corresponding sockets also labeled on

the tube surface. See Reference Diagrams for further clarification. Insert each tube in the

corresponding socket.

Starting with the 9 pin small signal tubes (the 6922s and 5687s), pay extra attention to

the tube pins and socket holes for these tubes. You will notice an open space where an

imaginary tenth pin or hole would be. This is for proper tube alignment. Be sure pins are

in line with holes when installing tubes. Gently rock the tube into the socket until the tube

is firmly seated. The 6922 tubes are inserted into sockets designated V1 to V4 and the

5687 tubes are inserted into sockets V5 and V6.

DO NOT PLACE 6922 TUBES IN A 5687 SOCKET OR A 5687 TUBE IN

A SOCKET DESIGNATED FOR A 6922 TUBE. THIS COULD RESULT IN

DAMAGE TO THE TUBE, AMPLIFIER (OR BOTH) THAT WOULD NOT BE

COVERED UNDER WARRANTY.

The 5687 tube is designed to run very hot. In its implementation in the Power 3, it is

being used at 1/3 its ratings. Even at this rating, the 5687 still gets hot and therefore,

the 2 Pearl™Tube coolers should be installed over the 5687 tubes. The chassis has been

designed with larger holes to accommodate these essential devices to keep these tubes

“comfortable” and allow efficient operation. Just slide the coolers over the already

installed tubes and add the rubber O rings around the coolers to clamp them in place.

Note the larger space

between two of the pins and

holes for proper alignment of

tube and socket.

When installing the 6550C/KT88 power tubes, match the numbers designated on the

metal base of the tube or the tube boxes to the corresponding markings printed on the

tube top (V7 through V14) and be sure the center pin key locator is in alignment with the

slot in the center of the socket. Again push down the tube, rocking gently until it is firmly

seated.

Note the locating center key

and notch for proper

alignment of tube and socket.

Biasing of the Power Tubes

Bias voltage applied to the grids of the power tubes in the output stage should be

checked from time to time (once a month) to keep these tubes operating at the optimum

operating point. A properly biased power tube will have a longer, happier life.

To check the bias of the 6550C/KT88 tubes, place the amplifier in mute with the power

on and the amplifier in operate mode (STANDBY LED Green; Power LED Red-for MUTE).

Looking at the tube top, take note of the power tube location and the bias LED below the

surface of the chassis next to each tube. Also note the printed line that leads to each

power tube. At the opposite end of this line is the bias adjustment for each power tube, a

small slotted metal shaft, again located below the chassis surface. See reference dia-

grams for further clarification.

If a bias LED is glowing red the tube is overbiased; if a bias LED is glowing green the

tube is underbiased, both conditions cause undue wear and/or are not optimal for the

tube. The LED should not be glowing at all for the proper operating bias.

To properly bias the tubes is a simple procedure. For the power tubes on the left (V7 to

V10) insert the biasing driver into the slot head of the bias adjustment control and turn

the driver to adjust the control counterclockwise so the LED is green. Turn the adjustment

back clockwise until the LED begins to dim. At this point; through careful adjustment,

continue slowly turning the bias control, stopping the moment the LED goes out. No light

from the LED indicates a properly biased tube. For the most accurate biasing, the

biasing controls should always be rotated from the LED emitting green

to the LED emitting no light, stopping immediately, as soon as the LED

emits no light. Repeat procedure on the next tube until all tubes are properly biased.

For tubes on the right side of the amplifier (V11 to V14) the biasing controls are oppo-

site. Turn the biasing controls clockwise initially to decrease bias so the LED is green and

counterclockwise until the LED goes out. Refer to the Tube Top diagram for direction.

A cutaway of the tube

top showing the location of

the biasing controls below

the tube top surface

and the biasing driver.

Controls, Functions and Connections

Front Panel Refer to Reference Diagrams.

CPower Switch This switch provides control over the AC power from your wall outlet. When OFF (out

position) nothing on the amplifier is functional. When ON (depressed) the amplifier will

operate normally (green power LED indicates ON; Red Power LED indicates ON but in

MUTE mode).

DStandby Switch This switch when OFF (out position) will allow normal operation of the amplifier (indicat-

ed by the green Standby LED, assuming Power ON). When depressed ON the amplifier

will be placed in STANDBY mode and will not be operational (indicated by the red

standby LED, assuming Power ON). In this mode, a small amount of current will remain

flowing through the tubes, this reduces power consumption and extends tube life during

periodic short term non-use periods (i.e. during a listening session when interruptions

occur, or a short time prior to a listening session so the amplifier is warm and ready).

This mode also will keep optimal warm up times of the tubes shorter. For periods

between listening sessions extending over a 12 hour period, it is recommended that the

Power 3s are turned off via the Power Switch.

EPower LED When this LED is off, so is the amplifier. When the LED is glowing red, the amplifier is in

Mute, controlled by the Input Selector Switch. When the LED is green, the amplifier is

receiving power and an input is selected, the amplifier is ready for operation.

FStandby LED When this LED is off, so is the amplifier. When the LED is glowing red, this indicates the

amplifier is in Standby mode, controlled by the Standby Switch. When the LED is green

the amplifier is in operate mode.

Rear Panel Refer to Reference Diagrams.

GDetachable Power Plug the detachable Power Cord into this socket. The Power 3 amplifiers are configured

Cord Socket for the operating voltages in which they are sold. See shipping box or Voltage/

Impedance sticker on rear of the chassis for voltage settings. If a different operating

voltage is required, please contact an authorized Sonic Frontiers dealer or the factory

directly.

HFuse Location This socket/holder houses a 7 amp slo-blo fuse for countries with AC supplies

rated between 110-120V or a 3.5 amp slo-blo fuse for countries operating on

a 220-240V supply.

REPLACEMENT FUSES MUST BE RATED WITH THE SAME SPECIFICATIONS

AS THE ORIGINAL FUSE.

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