RADIOMARELLI MOD. RV519U CRT TUBE PHILIPS A59/15W.

QUICK REFERENCE DATA

59cm (23in) direct viewing television tube with metal backed screen.
This tube is electrically identical to the A59~11W.


Deflection 110 deg
Focusing Electrostatic

Light transmission (approx.) 50 %
Maximum overall length 36.7 cm

 This data should be read in conjunction with GENERAL OPERATIONAL
RECOMMENDATIONS —CATHODE RAY TUBES, which precede this section
of the handbook.

HEATER
Suitable for series or parallel operation

V11 6 . 3 V

lb 300 mA
The limits of heater voltage and current are contained in 'General Operational
Recommendations - Cathode Ray Tub es ' .

Note - (applies to series operation only). The surge heater voltage must
not exceed 9 .5V r.rn.s . when the supply is switched on. A current limiting
device may be necessary in the circuit, to ensure that this voltage is not
exceeded.

OPERATING CONDITIONS

9
Va2 #114 -0 20 kV
V213 (focus electrode control range) 0 to 400 0 to 400 V
V 400 500 V
3.1
Vg for visual extinction of focused raster —40 to ~77 ~50 to -93 V
*V for Visual extinction of focused raster 36 to 66 45 to 80 V

k

*For cathode modulation, all voltages are measured with respect to the
grid.

(-7
JANUARY 1966
SCREEN

Metal backed

Fluorescent colour White

Light transmission (approx.) 50%

Useful screen area see page D6
FOCUSING

Electrostatic

The range of focus voltages shown in 'OPERATING CONDITIONS' results
in optimum overall focus at a beam current of 250M.

DEFLECTION
Double magnetic

The deflection coils should be designed so that their internal contour is
in accordance with J.E.D.E.C. gauge 126, and should provide a pull-
back of 4mm on a nominal tube.

CAPACITANCES
°g-a11 6.0 pF
ck-flll 4 .o pF
caZ-la4 -M 1700 to 2500 pF

EXTERNAL CONDUCTIVE COATING

This tube has an external conductive coating M, which must be earthed,
and the capacitance of this to the final anode is used to provide smoothing
for the e.h.t. supply. The tube marking and warning labels are on the
side of the cone opposite the final anode connector and this side should
not be used for making contact to the external conductive coating.

RASTER CENTRING

See note under this heading in 'General Operational Recommendations —
Cathode Ray Tubes' .

Centring magnet field intensity 0 to 10 Ga

Maximum distance of centre of
centring field from reference line 57 mm

Adjustment of the centring magnet should not be such that a general
reduction in brightness of the raster occurs.

REFERENCE LINE GAUGE

J.E.D.E.C. 126. For details see ‘General Operational Recommenda-
tions — Cathode Ray Tubes' .



JANUARY 1966
TELEVISION TUBE A59-15W

MOUNTING POSITION Any

The tube socket should not be rigldly mounted but should have flexible
leads and be allowed to move freely. The bottom circumference of the
base shell will fall within a circle of 40mm diameter which is centred
upon the perpendicular from the centre of the face.

This tube is fitted with a pin protector in order to avoid damage to the
glass base due to bending of the base pins whilst handling the tube.

It is advisableto keep this pin protector on the base until it can be replaced
by the socket after installation of the tube in any equipment.

RATINGS (DESIGN CENTRE SYSTEM)

Va2+a4 max. (at la2+a4 = 0) (see note 1) 20 kV
va24a4 Mn. 13 kV
+V max. 1.0 kV
a3 ,
—V max. 500 V
a3
Wa3(pk) max. (see note 2) 2.5 kV
V max. 700 v
31
V min. 350 V
a).
-v max. see note 2 400 V
g(pk) ‘ ’
‘Vg max. (see note 3) 150 V
flaa max. 25 uA
flal max. 5 v uA
vh—k (see note 4)
Cathode positive
d.c. max. 250 V
pk max. 300 v
Cathode negative
d.c. max. 135 V
pk max. 180 V
Rh-k max. 1 .0 Mn
Zk—e max. (f = 502/5) 100 Ml
F. max. 1.5 M9
g—k
zg_k max. (f = 50c/s) 500 kn
(-7

——_ ———_——
JANUARY 1966
1. Adequate precautions should be taken to ensure that the receiver is
protected from damage which may be caused by a possible high voltage
flashover within the cathode ray tube .

2. Maximum pulse duration 22% of one cycle with a maximum of 1.5ms.

3. The d.c. value of bias must not be such as to allow the grid to become
positive with respect to the cathode, except during the period immediately
after switching the receiver on or off when it may be allowed to rise to
+2V.

It is advisable to limit the positive excursion of the video signal to +5V(pk)
max. This may be achieved automatically by the series connection of a
101m resistor .

4. Duringan equipment warm—up period not exceeding 15 seconds Vh—k(pk)
max. (cathode positive) is allowed to rise to 410V. Between 15 and 45
seconds after switching onadecrease in Vh-k pk max. (cathode positive)
proportional with time from 410V to 250V is permissible.
WARNING

X-ray shielding is advisable to give protection against possible danger of
personal injury arisiugfrom prolonged exposure at close range to this tube
when operated above ZOkV.

WEIGHT
Tube alone 12 kg
26 . 5 1b

TELEVISION TUBE A59-15W