Elenos T30000, Руководство пользователя

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Hand Book T30000 -
18
Technical Office TEL: +39 532 829 965 FAX: +39 532 829 177
INSTALLATION OF THE THERMIONIC TUBE
When the T30000 amplifier is in its final position, installation of the thermionic tube may proceed. The
directions which follow are also valid for periodic replacement of the thermionic tube; for this reason
it is a good idea to leave a copy of the technical manual available nearby. The electrical circuit breaker
supplying the whole transmission system must be open before performing this operation so that the
system is ISOLATED from electrical power. The T30000 must also be ISOLATED from the radiating
system. WARNING! During the installation of the thermionic tube, the hands of the operator will be in
physical contact with parts normally functioning at HIGH VOLTAGE. Even if the equipment has been
inactive for some time, it is ESSENTIAL that a conductor be used to electrically connect the high
voltage supply to the chassis of the unit. WARNING! In order to discharge the high voltage capacitor,
connect the solid conductor to the unit's chassis at the point INTENDED for this operation: the
electrical junction connecting the overcurrent-limiting series power resistor with the anode of the
thermionic tube. If the high voltage capacitor is discharged at a point other than that previously
described, it is possible to cause permanent damage to the equipment. Remove the top panel of the
unit. Remove the hot air exit flue above the amplifying cavity after having disconnected the thermal
probe tied to the flue. Take the thermionic tube out of its packing and check that it is whole and fit for
operation. The thermionic tube should not show any signs of smearing with pollutants on any part; if
this is not the case, contact the supplier. Introduce the thermionic tube into the amplifying cavity
keeping the tube VERTICAL and CENTRAL and rotated so that its "handles" are turned towards the
side walls of the amplifying cavity. WARNING! It is possible to damage the socket during installation
of the thermionic tube, in particular the spring "finger" contacts of the control grid electrode. Proceed
with care and caution, do not force and, in particular, AVOID ROTATION and TORSION to the
vertical axis of the thermionic tube. To ensure that the thermionic tube is correctly positioned in its
socket use a small mirror and torch to verify that the circular control grid contact is well inserted into
the "fingers". WARNING! Exciting the unit with RF when the tube is not correctly inserted will
probably cause damage to both the tube and the equipment. The installation of the thermionic tube is
concluded when the hot air exit flue is refitted, the thermal probe reconnected and the top panel
closed. WARNING! Do not forget to remove the safety shorting cable between the high voltage
contact and the unit's chassis before re-fitting the panels.