R.V.R. Elettronica VJ8000-TR, Technical Manual

Page: 50 / 81

Date: 25/07/03 R.V.R. Elettronica S.r.l. (BO) VJ8000-TR - R.F. Tube Amplifier
50
In this manual is furnished the jumpers position for the Yu148 tube installed on the VJ8000-
TR
Once finished the previous operations it’s necessary to connect a power supply with an
ammeter in series (as shows in the following figure) to calibrate the IA and IG1 maximum
current (IG2 not present in this equipment because triode version, present on the tetrode
version). After the test point output voltages through the trimmers placed on the multimeter
card, verify that the instrument, placed on the hinged front panel, read correctly.
If the reading of the multimeter corresponds to preset value, verify that the selector is on
CAL position and the instrument read the full scale, otherwise turn TR10 trimmer to
calibrate the instrument. Now, it’s possible to calibrate the measures using trimmers placed
on the measures card that correspond to the requested measure. After the current calibration
is possible to calibrate the voltage reading, using a multimeter to read the input voltage
values too. VG1, VG2 and VA voltages is naturally measured on the test points and to
simulate the equipment working is necessary to refer to voltage values indicated on the
relative TABLE D.