ALLNIC AUDIO H-6500 Manuel utilisateur

ALLNIC AUDIO

H-6500 PHONO-STAGE PREAMPLIFIER

OWNER’S MANUAL

ALLNIC AUDIO

H-6500 PHONO-STAGE PREAMPLIFIER

Thank you for purchasing the Allnic Audio H-6500 Phono-stage

Preamplifier. We are certain your trust in Allnic Audio and its dealers

worldwide, as well as your appreciation for the sound of this high-quality

device, will be rewarded by its excellent operation for years to come.

Please read this entire manual before you connect the H-6500 Phono-

stage to the other components of your system and the wall outlet.

Audiomentors

(Allnic Audio marketing company)

415, Daeduck Plaza

19-4 Sunae-dong, Bundang-gu,

Seongnam-si, Gyeonggi-do,

13595 S.Korea

Direct Telephone: 0082-31-716-3311

email: [email protected]

Website: www.audiomentors.co.kr

** Information and specifications for the Allnic Audio product

described in this manual are subject to change without notice.

TABLE OF CONTENTS:

INTRODUCING THE H-6500 PHONO-STAGE PREAMPLIFIER

WHAT’S IN THE BOX?

SAFETY

CLEANING

Chassis

Connectors

INITIAL SET-UP

Location, Location, Location

Power Connections

Inputs

Outputs

Moving Coil (MC) Transformer Controls

A Note on Phase

Impedance

INITIAL POWER ON

OPERATION

CURRENT METERS

TUBES

SPECIFICATIONS

WARRANTY

FIGURES

Please read about SAFETY before you attempt to use the H-6500 Phono-

Stage Preamplifier - we care about our customers and the equipment,

and we want you to enjoy this product for a long time!

INTRODUCING THE H-6500 PHONO-STAGE

The H-6500 is Allnic Audio’s mid-line phono-stage model, above the H-5500 and below

the H-7000 and the top-of-the-line H-8000 DHT. Like all Allnic Audio products, it uses

Permalloy (iron and nickel alloy) for its transformer cores. Allnic is grateful to Mr. G.W.

Elmen of Western Electric for inventing Permalloy for transformer core use, and in so

doing, providing an enormous service to recorded music listeners everywhere.

The H-6500 has the following features:

• LCR TYPE RIAA EQUALIZATION:

RIAA equalization is a specification for the correct playback of vinyl records, established

by the Recording Industry Association of America. The purpose of the equalization is to

permit longer playback times and improve sound quality.

RIAA equalization is a form of establishing a flat frequency response for the playback of

recorded music. The necessity for this equalization process arises from mechanical

difficulties inherent in record production. To prevent the cutting needle from over-

cutting into the next record groove in the bass, as a record is cut, some bass frequencies

are attenuated. In the treble region, for high frequency sounds not to be masked by the

noise inherent in moving a stylus over and through a modulated vinyl surface, some

treble frequencies are boosted. With the application of the correct filtering techniques

on playback, the result is a flat frequency response with better signal to noise ratios.

There are four de-emphasis methods that can be applied at playback:

A. Active filters (Negative feedback types):

Different quantities of negative feedback are applied, with deeper feedback to the

high frequencies and shallower to the low frequencies. The benefits of this method

are improved signal to noise ratios, low-cost and consistent operation. Some of the

shortfalls are looser bass reproduction and possibly a pinched and compressed high

frequency playback due to

excess feedback ratios.

A. Passive filters (CR type):

- The frequencies are filtered to fit the RIAA specification by varying the amount of

attenuation at different frequencies through a complex capacitor-resistor network.

This technique results in no voltage overload, purer reproduction (because there is

no feedback), and more accurate RIAA compensation. However, there are problems

because the system provides no gain, and insertion loss and impedance matching

issues arise.

B. Hybrid filters (use of both CR and negative feedback types):

In this method, both types of filters applied separately; an active filter is applied to

the low frequencies and a passive filter to the high frequencies. Unfortunately, both

the advantages and disadvantages of each of these two types of filters, already

discussed, affect the playback system at the same time.

C. LCR filters, which are used in the H-6500:

Two pieces of a linear reactor (a kind of choke coil) comprise the main part of these

filters, assisted by precise CR filters, to lower impedances and insertion loss. In

vacuum tube circuits, active and passive filters usually are operated on one hundred

plus kilo ohms of impedance. An LCR RIAA filter's impedance is a constant 600 ohms.

Furthermore, an LCR RIAA filter's series resistance is less than 13 ohms (as a

comparative, some famous ones are 31 ohms). The lower the impedance, the more

dynamic is the sound reproduction, with better bass response and speed.

But LCR RIAA units have drawbacks as well. These drawbacks are high cost and the

difficulty of impedance matching; the latter has been the primary hindrance to the

commercialization of this superb method in the construction of phono-stage

amplifiers. However, Allnic Audio manufactures a high quality LCR RIAA unit and has

developed a 600 ohms impedance matching method.

• For superior signal to noise ratios, the H-6500 is equipped with pure vacuum tube,

high voltage regulation for each channel

• power supply unit separate from the phono-stage itself

• High quality MC Step-up Transformers with Permalloy cores are used for the H-6500’s

dual MC inputs

• Pure Class A operation

• As are all Allnic Audio products, the H-6500 is fully RoHS (EU Reduction of Hazardous

Substances regulation) compliant in construction and materials

WHAT’S IN THE BOX?

Please check that the shipping box contains the following:

• One (1) Allnic H-6500 phono-stage – in natural aluminum or black, depending on

your order specification

• One (1) Power Supply for the H-6500 in natural aluminum or black, depending

on your order specification

• One (1) power umbilical cord

• One (1) IEC type power cord

• One (1) Owner’s Manual

Note:

1) The H-6500 and its power supply ship with the tubes installed.

2) The H-6500 power supply will work with most IEC type aftermarket power cords.

Allnic’s ZL Technology cables will function synergistically with the H-6500. Of

course, only you can determine the power cord that works most synergistically

with the H-6500 in your system.

3) Be sure the H-6500 power supply unit is labeled for the AC voltage of your

location. If it is not, please contact your Allnic Audio dealer.

We advise that you keep the boxes and other packing materials that your H-6500 came

in. It will be useful if you sell your H-6500 or in the unlikely event you need to ship it or

the power supply for service.

SAFETY

• Disconnect the power cord by pulling the plug, not the cable.

• Do not attempt any repairs. Do not remove the units’ chassis covers without specific

authorization from Allnic Audio.

• Keep the power cords away from heat sources.

• Keep the units away from liquids – do not allow any liquid to enter the interior of the

units.

• When the units are moved from a cold to a warm environment, allow sufficient time

for any condensation to evaporate in both units before plugging the power supply

unit into an AC connection.

• Do not attempt any repairs.

• Do not remove the units’ chassis covers without specific authorization from Allnic

Audio.

• See the notes on “Location, Location, Location”.

CLEANING

A. Chassis

Use only a soft, lint-free cloth dampened slightly with water only (NO cleaning fluids!) to

clean the faceplate and chassis of the H-6500 and its power supply.

B. Connectors

You may use any good quality contact cleaner recommended for such applications to

clean the contacts from time to time, as you deem appropriate.

INITIAL SET-UP

A. LOCATION, LOCATION, LOCATION

Like all audio products using tubes, the Allnic Audio H-6500 and its power supply need

to be placed on a solid stand in a location that provides good air circulation around both

the phono-stage and the power supply.

• DO NOT cover the top of the H-6500 phono-stage or the ventilation slots in the

top of the power supply chassis.

• DO NOT place the units on carpet or foam.

• DO NOT subject the units to knocks and shocks as you move them around. This

advice is meant particularly for those who may want to place the H-6500 or its

power supply on after-market isolation feet or similar devices. Dropping one side

of either of the H-6500 units, or the whole of either unit, is not a good thing to do

and damage incurred by doing so will not be covered by warranty.

• DO NOT place the units near a strong light or heat.

• DO NOT place anything heavy on the units.

• DO NOT allow rubber or vinyl materials to rest on either units’ chassis for long

periods

of time. This could discolour the metal.

• DO place the units on a shelf or stand that is stable and not subject to vibration

or sudden shock.

• DO consider using a high-quality power cord and inter-connects, for both inputs

and outputs. The H-6500 is a highly sensitive piece of electronic designed for

neutrality and will output what you put into it.

• DO try to place the H-6500 and its power supply away from major sources of RFI

and EMI; though well shielded, the H-6500 units will function best away from

large power transformers and other sources of such interference.

B. POWER CONNECTIONS

The H-6500 power supply uses a standard three prong male IEC connection for AC input

(See Figure 1), located on the right-hand side of the rear of the power supply (facing the

rear). You need to use a power cord with a female three prong IEC connector at one end.

The H-6500 power supply connects to the phono-stage itself using the supplied umbilical

cable. Connect the units to each other using the provided umbilical cable, with the

appropriate screw-on connections to the receptacle labeled “DC Source Input” on the

rear of the phono-stage and the connection terminal labeled “DC Source Output” on the

left side of the rear of the power supply (See Figure 1).

The H-6500 power supply you have purchased is set internally for your region, either

AC 230/240 volt – 60 HZ OR AC 110/120 volt – 60Hz operation for USA, Canada.

There is no way to change this to another AC setting.

C. INPUTS

There are two (2) sets of two (2) pairs of single-ended (RCA) inputs (See Figure 2). These

two pairs are located on the left-hand side of the rear of the phono-stage (facing the

rear - See Figure 1). Each channel pair of inputs is aligned vertically, with the left channel

input at the top and the right channel input on the bottom. The two left hand pair of

inputs (facing the back of the phono-stage) have an “MC” label above the two upper,

i.e. the left, channel connectors; these are the two input pairs for moving coil cartridges.

The two right-hand pairs of inputs have an “MM” label above the left channel

connectors; these are the two input pairs for moving magnet cartridges.

In each case, for both MC and MM connections the left hand vertically aligned pair of

connections (again, facing the back of the unit) corresponds to input 1 for the button

switch on the front panel of the phono-stage, while the right hand vertically aligned pair

is input 2.

To the left of the four MC RCA input connections is a screw type connector. This

connector is the ground connection for a ground wire from a cartridge and/or turntable

if you are using a moving coil cartridge. To the right of the four MM RCA input

connections is another screw type connector. This connector is the ground connection

for a ground wire from a cartridge and/or turntable if you are using a moving magnet

cartridge (See Figure 2).

When you are facing the front of the H-6500, the two pairs of MC connections are on the

far right of the unit, with the two MM connections immediately to their left.

The H-6500 has been designed and manufactured to work most synergistically with Allnic

Audio active phono preamplifiers, line stages, amplifiers and ZL cables.

D. OUTPUTS

The H-6500 is equipped with one pair of single-ended (RCA) outputs (See Figure 2).

The right and left channel output connections are also aligned vertically under the

label “Output” just to the left of the DC Source Input (See Figure 2), with the left

channel output at the top and the right channel output connection at the bottom.

Facing the front of the phono-stage, the output connections are to the immediate

right of the power umbilical cord connection.

E. MOVING COIL (MC) TRANSFORMER CONTROLS

On the top of the chassis, on the right if you are looking down facing the front of the

phono-stage, there are two pillars with rotary controls on the top. These are the MC step-

up transformer controls. There is a control for each channel (See Figure 5).

The “X#” scale corresponds to the factor that you will select closest to the millivolt output

of your selected MC cartridge. Each position on the X# scale corresponds to an increase

in gain, indicated on the +#dB scale. You should use identical settings for both

transformers to avoid channel imbalance.

F. A NOTE ON PHASE

Phase issues generally will result in lack of bass and/or focus of the stereo image. You

may need to reverse connections on your cartridge if you are having phase issues. As is

usual in these circumstances, some trial-and-error experimentation may be required to

find the correct position. Of course, the entire process is simplified if your preamplifier

has a phase control, as do many of the Allnic Audio preamplifiers.

G. IMPEDANCE

In the Specifications section near the end of this manual, you will read that the

moving coil (MC) input impedance for the H-6500 is up to 117 ohms. This value

represents the internal impedance of the cartridge itself and is at the extreme upper

end of what would be expected for the internal impedance of an MC cartridge. It

would be exceptionally unusual to find a cartridge with internal impedance greater

than that value. In fact, however, the MC step-up transformers in the H-6500 can

accept cartridges with up to 470 ohms internal impedance.

MM input impedance is set at 47kΩ.

INITIAL POWER-ON

Once you have your H-6500 in place and all connections have been made to your

turntable and preamplifier, you are ready to turn on the power for your H-6500. Before

you power up the H-6500, though, be sure you have:

• turned the volume down or otherwise muted your preamplifier

• pressed the “muting” button switch on the left-hand side of the front panel of the

phono-stage labeled with “mute” and “operate” icons so the button is “down”

(operate) (see Figure 4).

• pressed the input selector button switches on the right-hand side of the front

panel of the phono-stage to the appropriate positions for the cartridge type: the

right-hand button selects either MC (button out) or MM (button in), and left-hand

button selects the input, “1” (button out) or “2” (button in) that you will use

initially (See Figure 4).

• if you are using a moving coil cartridge, set the MC transformer controls on the

top of the chassis to the factor that you will try initially

• checked that all your connections are snug

To turn on the H-6500, press in the button switch on the front of the power supply

marked with on and off icons (see Figure 3). Of course, the off position is the reverse,

pressing the button again so it is returns to the maximum raised position.

OPERATION

When the power supply is on, the light on its front panel will illuminate, and the light

below the words “ALLNIC H-6500” and the current meters on the front panel of the Allnic

Audio H-6500 phono-stage will illuminate (See Figure 4).

After a forty (40) second automatic protective “mute” period, the Allnic Audio H-6500

will be ready for operation.

To avoid surges to the speakers, it is best to switch between MM or MC input, or between

inputs 1 and 2 of either, only with the H-6500 in “mute” mode and with your preamplifier

volume down or otherwise muted.

From this point on, operation is straight-forward. All functions except for MC

transformers’ gain selection are controlled from the front panel (See Figure 4). Of course,

BE CAREFUL about differences in gain between your sources. Generally, DACs, digital

media players, and tuners will have greater gain than phono-stages. That means the

volume setting for listening to your turntable might be too high for listening to CDs, for

e.g.

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