User Manual

STEREO

MK2-T

Internal power supply

based around a

torroidal transformer.

Voltage selector

Ground-lift switch

Transformer, power cord and

mains connector with VDE,

UL and CSA approvals.

FUSE: 315 mA

Positive and negative voltage

paths are smoothed with

4000microF capacitors.

High voltage regulated

tube power supply.

Power Supply

Special care has gone into the design of the power supply of the

Stereo Vitalizer MK2-T because the power supply is the heart of

any electronic system, and the better it is, the better the whole

system works.In an audio system, this translates into better sound

quality, lower noise and lower distortion.

The power supply is based around a 15 VA torroidal transformer

and is designed to minimise induced hum and noise due to the

lack of an air-gap.

The primary voltage may be selected between 230 V / 50 Hz and

115 V / 60 Hz by means of a recessed slide switch on the rear panel

and a rear-panel ground-lift switch is fitted for use where ground

loops are causing hum problems. When the Gnd Lift switch is set

to off, the circuit ground is isolated from the chassis ground.

The detachable power cord is a standard 3-wire type fitted with

an IEC mains connector; the transformer, power cord and mains

connector have VDE, UL and CSA approvals.

The fuse has a value of 315 mA for the primary voltage.

On the secondary side of the power supply, an RC combination

is used to filter out noise and hum voltages. Both half-waves are

smoothed with 4000 microF capacitors in the positive and nega-

tive supply path, and both lines use precision voltage regulators

for optimum stability. Deviations of only a few millivolts can

impair audio quality, introducing artifacts such as loss of stereo

imaging or a diffuse sound character.

The operational voltage of the tubes (225 V) is heavily smoo-

thened and electronically regulated. Both inputs and outputs of

the tubes are smoothened with condensers of high voltage and

condenser values (300 microF/400 V/5 %) to minimise offset

voltages.The tubes are de-coupling at about 10 Hz.