Table of Contents
Advertisement
Fig. 22. Anode connection
K
/•"/£,'. 23. Positioning the c.r.t.
Remove the tube holder (for connection see page 87).
- Hold the tube at the front and then p u l l it from the protective housing
and rubber cap. When the tube is inserted it is recommended to s p r i n k l e
a l i t t l e t a l c u m powder over the lower part of the tube, so t h a t it slides
more easily into the rubber cap. See to it t h a t the protective casing is not
damaged (dents etc.).
After the new cathode ray tube has been inserted m a k e sure t h a i the
t i m e base line runs exactly h o r i z o n t a l l y . If this is not the case, t h e t u b e
can be correctly positioned by means of lexer "H" (Fig. 23; if necessary,
first loosen the screws "K" a little).
Subsequently the quality of the picture, the deflection s e n s i t i v i t y and t h e
sweep times of the time base must be checked and readjusted, if necessary
(sections V.B, V.C, V.D.2. V.E.2 and V.F.4).
2. Valves, diodes and other components
All component parts have been taken from n o r m a l production stock.
After replacement of valves or other component parts it may be necessary
to readjust the appropriate part of thecircuit. (See chapter V, "Checking
and adjusting").
New valves can be aged by allowing the apparatus to be switched on for
100 hours. Aging can also take place outside the apparatus. The valves
are then connected as diodes (in the case of pentodes connect the grids
and in the case of triodes the grid to the anode). The anode voltage is so
chosen that the quiescent current at normal heater voltage is l/6th of the
m a x i m u m permissible cathode current.
Advertisement
Table of Contents
