Balanced-audio REX II Power Manuel d'utilisateur télécharger pdf (Page 9)

Protection Circuits

Your REX II Power amplifier is equipped with two types of sophisticated

protection circuits.

Thermal Protection. Thermal protection circuits monitor power

dissipation in each of the unit’s four output tubes. Should the power

dissipation in that part of the circuit exceed the preset value, the

protection mechanism will disable that particular tube. The corresponding

green LED will then go out.

When this happens, simply turn the unit OFF using the rear panel power

switch, then turn it back ON after waiting a couple of minutes. That

should clear the thermal protection mechanism.

Overcurrent Protection. There are four independent over-

current protection circuits monitoring the currents flowing through each

output tube. Should the current excee the preset value, the protection

circuit will disable that particular tube, and the green LED will go OFF.

To clear the fault one should simply power cycle the unit OFF and then

back ON.

Understading the Overcurrent Protection.

The REX II Power can enter over-current protection mode if either of the

following conditions take place:

1. The unit is being driven hard into a speaker that represents a

particularly difficult load. At a point of peak demand the over-

current protection may become activated. Power cycling the unit

will restore its operation.

2. An over-current protection due to an intermittent internal

discharge in one of the power tubes.

The internal discharge can take several forms. In some instances the

weak spot in the tube will evaporate, and the tube will continue working

normally for an extended period of time.

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Balanced-audio REX II Power Manuel d'utilisateur Page 9