Hughes & Kettner VS 250 Manual de usuario

USER MANUAL

Hughes & Kettner

VS 250

Stereo

Tube

Power Amplifier

Hughes &Kettner

Stereo Tube Power Amplifier

250

Congratulations!

You have just acquired a highquality sound tool which combines the sonic superiority of

vacuum tubes with the optimum usefulenss of a guitar rack. The VS 250 incorporates the

sum of our experience with vacuum tubes. May you enjoy the new measure of expressiveness

and creative freedom it affords.

The following operating instructions delve into the special features and

capabilities

of the

VS 250 in detail.

The Hughes

Kettner

250

is a twochannel tube power amplifier. As with all tube

devices, there are a few things you should pay special attention to:

)

Tubes require a specific operating temperature. For this reason a tube device needs a

moment after power-up (depending on the operating environment about 20 seconds or SO)

until it is completely ready for operation.

)

Tubes are sensitive to being jostled or shaken when hot. After use, allow the unit to cool

down for a few minutes before transporting it. Avoid subjecting it to strong vibrations while in

operation.

)

A tube amplifier should never be operated without a load (speaker) connected to it.

)

Tubes produce heat. Make sure that the vents in the front and back of the unit remain

unobstructed.

CONTROLS

The VS 250 has two independent channels, identical to each other. The controls for each

channel are likewise identical; so what is said below about channel A also holds true for

channel B.

FRONT

Stand by

There are two different levels of voltage controlling the tubes:

1) the basic voltage intended to warm the tube to minimum operational temperature. This

voltage is always applied to the tube whenever the power switch is in the on position.

2) the operating voltage (plate voltage) which drives the tube. The operating voltage is turned

off with the STANDBY switch.

The green LED indicates the unit is in standby mode, the red LED above the STANDBY switch

indicates normal playing mode.

If you are using only one channel of the switch the other channel into standby mode.

Volume

VOLUME controls how much the input signal is amplified, thereby controlling the output

volume of the channel. Due to the special LINE DRIVER circuitry in each channel’s input,

VOLUME offers a very wide range of control which also accommodates devices with very low

output levels (300

are perfectly adequate to drive the output stage; voltages up to 10 volts

can be accepted without overloading the input).

Presence

With tube amplification, the higher frequencies (PRESENCE) are most

effectively

controlled at

the power amp stage. This frequency range plays a major role in determining the character of

the guitar sound and its ability to cut through.

The intensity of the PRESENCE control depends to a great degree on the guitar sound itself:

heavily

overdriven

sound with a great deal of overtone energy will respond to the PRESENCE

control much more dramatically than will a clean sound with little overtone content.

Over the last 30 years of tube amp tradition, two different types of PRESENCE control have

established themselves as standard:

)

the

British” type, which only affects higher frequencies, and only boosts, and

)

the “American” type, which affects a broader range of frequencies from high mids to

harmonic overtones, and can either boost or cut.

Since both PRESENCE philosophies make sense, and both allow for very different characters,

particularly with

overdriven

sounds, the VS 250 offers both types.

PRESENCE 1 is the “American” type. The signal is unaffected when the control is in the

3-o'clock"

position.

PRESENCE 2 is the

British” type. in the fully counterclockwise position, the sound is

unaffected.

With the SELECT switch you can alternate between PRESENCE 1 and PRESENCE 2. The

triangular-shaped

LEDs

indicate which presence control is currently active. On the back of

the

VSZ50

there is one l/4” jack per channel for connecting a footswitch to select between

PRESENCE 1 and PRESENCE 2.

Please note: The PRESENCE controls do not affect the tone as strongly in

TRIODE

mode than

in PENTODE mode!

Mains

Mains is the power switch of the

VS 250.

When the unit is powered up, the red LED above

this switch will be on.

It is good practice to switch each channel of the

VS 250

to STANDBY

both before powering up and before switching off.

BACK

Power Cord Jack

This jack accepts the

110/120-volt

power cord supplied with your unit.If you are on tour in

Europe, this jack will accept a 220/240-volt power cord. (See “Main Fuse” and “Voltage

Selector” below.)

Main Fuse

For overseas use, change

the fuse to match local voltage:

220/240

Volts -AT 2

1/2

Amp

110/120

Volts

Slo-Blo5amp

Voltage Selector

USA

110/120

volts

European continent and Great Britain

220/240 volts

Anode Fuse

Operating voltage of the tubes, fused separately for each channel.

Fuse rating: Slo-Blo

0.315

Amp or Slo-Blo 1/2 Amp

Pentode/Triode

The first guitar tube amps from the 30’s and 40’s utilized TREIODE power amp tubes.

Since

triodes tend to emphasize even-order harmonics, these amps had a very typical sound with a

warm even tone, even when overdriven. Great for sweet, warm, full, fat blues.

To obtain higher power levels, tubes were developed in the 50’s with 5 electrodes

(PENTODES), and these have since become standard in all tube amplifiers. PENTODES likewise

have their own typical effect on the sound.Even-order harmonics are neutralized, odd-order

harmonics stand out. This adds richness to the character of the sound, but also makes it

rougher, with an “edge”, lending itself spectacularly to rock-oriented music.

Each of the two channels of the VS 250 can be switched separately from PENTODE to

TRIODE mode. The power in triode mode is reduced to 25 watts RMS per channel; the sound

character changes as described above.

Please remember: for technical reasons, the effect of the presence control will be much more

noticeable in

pentode

mode than in triode mode, and will be more noticeable the more

overdriven a guitar sound you use!

Presence Select Footswitch

Connect a commonly available on/off footswitch to this jack, and you can alternate between

PRESENCE 1 and PRESENCE 2. If only one footswitch is connected, both channels will be

switched simultaneously.

Ventilation

Heat generated by the tubes in the VS 250 is transferred to a heat exchanger, which is cooled

in turn by an extremely low-noise fan. This design prevents excessive heat build-up in the

housing, and ensures even cooling of the tubes.

Please see to it that the ventilation slots on

both the front and the back of the VS 250 are not blocked.

Circuitry in the power amp stage constantly monitors the internal temperature.In the event of

overheating(caused, for example, by blockage of the vents), the VS 250 will automatically

shut down and thereby prevent any damage to itself.

Inputs

Each channel of the VS 250 has two parallel inputs. The LINE OUTS of a guitar preamp (or

effect unit) are to be connected here, one to each channel. The purpose of the parallel inputs

is. to allow for input bridging. You could, for example, connect a cable from the second,

parallel input jack of one channel to another power amp; or from Channel A of the VS 250 to

its own Channel B, thereby using the VS 250 as a 2x50-watt mono power amp.

Speaker Outputs

Each channel of the

250 has three speaker output jacks with different impedances: 4

ohms, 8

ohms, and

16 ohms. Use

the

jack which corresponds to the impedance of the guitar

loudspeaker cabinet which you are using. All three jacks may be used simultaneously.

If you

wish to connect two &ohm cabinets to one channel,

please connect one of the cabinets

to the 4-ohm input, and connect the second cabinet to the first in parallel.

you wish to

connect two

16-ohm

cabinets to one channel, please connect one of the cabinets to the 8-ohm

input, and connect the second cabinet to the first in parallel.

Technical Specifications

Tubes, each channel:

Driver stage: 1 x ECC 83 (or 12ax7 or 7025)

1 x ECC 82 (or 12AU7

Power stage: 4 x EL 84

Output per channel:

Pentode

mode: 50 watts RMS

Triode mode:

25 watts RMS

Input sensitivity:

300

volts

Presence control

per channel:

PRESENCE 1

4000 Hz, broadband

PRESENCE 2

6000 Hz, broadband

Loudspeaker jacks per channel:

16 ohms; all usable simultaneously

Cooling:

Temperaturecontrol-circuitry, heat exchanger, and Papst fan

Thermal protection, automatic shut-off

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