R.V.R. Elettronica 4CX7500, Technical Manual

Page: 32 / 82

Date: 25/07/03 R.V.R. Elettronica S.r.l. (BO) VJ10000-TE - R.F. Tube Amplifier
32
3.3 TUBE INSTALLATION
For the tube installation is necessary to execute the following procedure:
1) Connect the power supply cable in the relative socket paying attention to exact position of
the phases and neutral. The mains voltage must be the same for that is been set the
equipment (see as reference the test control card). Verify that the ground is very good.
Connect a dummy load with adequate power, or the antenna, to the amplifier’s output.
2) Open the hinged frontal panel placed on the R.F. section, unscrewing the screws "A" (
FIG.
15
) and then remove the frontal panel of the cavity.
3) Switch on the equipment through automatic interrupter and/or trough selector pressed OFF.
4) Now, enable the tuning push switches through the key selector and then push OUPUT
TUNE to lift up the plane with fingers until the top position. If the button RF APC is turned
on the tune motors don't works. Then, switch off again the equipment.
5) Loosen the clamp that fixes the plate ring and move it to the top limit (
FIG. 16
). Then,
insert the tube and at the same time turn it until the grid ring is perfectly on the fixed socket
ring of the cavity. To be sure of the correct insertion of the tube is necessary that the GRID 1
contact, that is the nearest to the plate, is totally inserted into the fingers mounted on the
socket plane.
NOTE: Don’t touch the tube ceramic with hands to avoid to leave traces of greasy; in case,
wash the part with trichlorethylene or acetone.
6) Once the tube is been inserted, fix the high tension block on the top part of the tube (
FIG.
18
). It’s very important to close this block correctly (using a setscrew wrench M5), so that
the tube doesn’t go out..
7) Then, decrease the plate ring until is perfectly connected to the tube as indicated in the Fig.
19, and then fix it with the apposite clamps both on the tube and on the plate ring.
8) Restart the amplifier, pressing OFF botton and contemporany OUPUT TUNE, to adjust
frequency before working (see related pages above this chapter).
9) When you have checked that all these operations are been executed correctly, close the front
panel. To make sure to not have left inside: utensils or bolts.