Philips 650 a service manual 2

Page 1

Broadcaster Service Man's Manual

PHILIPS 650A THREE-
BAND FIVE

mm.-Aerial input to the grid of
the HI. amplifier V1, an H.122 n-
tode, is via transformer coils. I¥he
A.V.C. potentials are applied direct to the

'6. instead of via. the tunin coils, a. grid
isolating condenser being used.

ELF. transformers provide the coupling
to the signal '11 of the EKZ ite-
quency changer, 2. Series grid resist»
ance- are included to the signal and oscilla-
tor grids and the reaction windings are
fed 'rect.

An iron core 1.]? transformer of the
fixed condenser type, tuned to 470 kos,
sheets the oouplin between V2 and V5,
megpiIdiR .fam er. VBkheoonih as an

.em 'er urgram. woz' ,tescreen
of the valve being used as the e elec-
trode of a. triads, the potentials hein fed
to the volume contml by R18, the cod,
and 057, the coupling condenser.

V3 is coupled by A further LF. trons-
iormer to the demodulsting diode of V4,
on ELBI double diode output pentode.

Both ptimory and secondsry oi the IF. -

down. The other
diode rovides s D. . tentinl controlling
V1 V2 via the A. .0. circuit.

The rectified impulses derived from the
demodulating diode are taken via a. tone
compensated memo] volume control to the
control grid of the pentode section of V4.
A pentode compensating condenser is con-
meted across the primary of the ape-km-
mtohing tmsionner, and also a tone con-
txol circuit, 042, 352 and REES. The
demodulated im lses also feed the M1
visual tuning in icstm'.

Mains equipment consists of a. full-wave

transformer are to

l

imimmimmpmln-an-an

rectifying valve, a mains transformer, elec-
trolytic smoothing condensers, and a sepa-
rate smoothing choke.

Challis BellwvaL-Remove hack of cabi-
net and the three h-sorew fixed control
knobs. Loosen t grub screw securing
the extension shaft of the tone control at
side of cabinet sud unsolder the mite to
the earthing tag of the metal screen on
the floor of the cabinet.

Remove the eight bolts from the four
metal brackets disposed two each side of
the chassis on the front (inside) ofthe
cabinet. The four bolts securing the wave-
length (pointer travel sssembly should be
remove from the roof of the cabinet,
taking care not to injure the Bowden
cables or to scratch the W.L. scale.

The chassis, complete with speaker
assembly, can then be withdrawn from the
cabinet.

Special Hoist-The mine adjustment
consists of a. bakelite disc, inscribed with
voltage values and mounted on an insulat-

No aim. Volume maximum. KW. min. con

V. Type. Electrode. Volts. In.
All Mallard.

1 RES . . Anode . . 265 4.3
Screen . . 190 .1
2 EKZ Anode 190 2.2
one. node 90 1.8
Screen 180 3.5
3 EFQ . . Anode 2% 6.4
2
A BBL]. . . Anode . 235 34
m 5 5
5 Phllipl All Hester 200 --

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Eu m5. meEmany s "E.ma-usosTMEu . mi»
mummy mmuml.

January, 1939

Although a live," the 050A lass a
signal amplifier me. With ortho-
dox mnnusl tuning l3 incorporate
cathode-ray indicator.

ing panel at the rest of the chassis deck.
To adjust, the disc should be pulled out
slightly until it is tree to turn and then
rotated until the desired voltage is at the
170;;' of the disc.

he mains input leads are taken vie. a
safety device to the connecting plugs on
the panel at the rear of the chassis. The
safety device must be removed from the
back if o'eration with the heck removed

.is desir .

A lever-operated Q.M.B. , gram-radio
switch is near the pick-up sockets. I

Another pair of sockets ennhles on exten
sion speaker of 7 ohms impedance to be
operated. '«

The visual tnnin indicator valveholder,
secured by a. mill nut, must be removed
before the Mullsrd type mu indie-int can
be removed The anode feed' resistsnce

R26 is connected across the holder.

The single dial and pointer illuminating
lamp is mounted on I hrs-fist on the
chassis deck. Agreflector strip is used to
evenly distribute the light over the wave-

.4

. i

Ls

_l

Page 2

January, 1939

Broadcaster Service .Marlls Manual

31, ' Phili k . u n ior to
linghsna his :3 is??? '55.: m by m regal. infirm mftslsikdlispolinect?ix:vlifier. «Ii 5 A

359. stopper resistance of V4, .is reconnect output motor-to WVBX'. remove short . 1 ps 6 o
mounted on on mutating strip on the top and .
connecting cow, and B5 on V2, (99, (31,35 and , » on I 'est
(34 are Inside the corresponding I.F._ trans- WINDINGS
{armor osns. Ola is inside the anode calls can. [b.c. Wanna) ODEL 650A _ A C msins
Alignment NOKCS . L. ohms. Bulge What-slimmed. 0° allaeratilof, 101%260 volts, EO-

IJ. cl HIM-Set audience switch to M.W.. 1 cyti es. rice gns.

m,1"""::;;, to stagnant 3° conghol Jag-513 1 .. 2 9-W- 1 m" "1 DnscmnfioN.b-Fémr-vallvle,t pins
on s as recover. a - _ 9 u
onea connect a service oscillstor between on 2 .. 25.1 MW. Aerial Iooketsml 3303:; g, 3%.; gig? we
552.9,,flm9'm'. . M fidwifimm; 3 LW. Aer-ls! socket and Fun-anus. ~ Full-vision scale,
in nous! manila Turn um to maximum. M- calibrated in metres and station

Shunt IRT rimnry with .00003 condensor. 3~w' and names traversed by an illumi-
tons smioe 1' W470 ills-«m adjust Ti 5 M-W- 013 W ated ointer Controls for tuning
to, mmmm ' a L.w. (us sud cm 1 .P d .1 d a cei-

- t mm 7 s.w. Am Ind 049 ooinblne vo lime _ on m s
I - ° wmw mm M s mw. Anode mica; sthuh, wave selection and tone.
uloisaoggco'a Icondenser mm? across i F T 1 9 L-W- WW- I 049' Visual tuning indicator. 5091"
prim. Sud sdJust T3 for maximum ' I 1° 3~W- w for extension speaker. ' Grsm-rsdio

Remove .00008 condenser connect across 1 MW U m switch at rest of chassis.

I.F.T.1 sac. and adjust TA ior maximum. . 1 - ' i. a LOADINB.-55 watts. ,
"3%"; mm Mew and 3'1"" mm" 12 l . «1 L.w. Eli. gong Ind Sensitivi and Selectivity .

sign-l 'OIruuNsFDul-lll sanity switch to chm-- slzonll Aims (15.7-51 {nette .-
mximum (clockwise. position 2). Fit 15 sexless 13 l', 3w 0., mm Excellent gain and selectivity U1
jig (available mm Philips) 59d set tho sunk to u -- 3 1in fig, r15 ve easily handling and is good
it (maximum positlon). Oonnoot the . 15 -: 18 Lw: Oso. m sud P2. bafigmund. ,
We IM l A: d E- 53 V1 10 .. 1.2 s.w. Ow.mogesnd624l Mmmm WAVIS (200535 metres}.
abininmdlgfiu'gl' "Big 9% fiflfltggfifi 17 - - 3 "-W owvinmhlndm -Well maintained sin with one -
gr aIlilassivolmMimi tfie'outlrotnss til-e oimuiis 5 - 3 L-w OW-nmfiml lent selectivity is local stations
cage into lillo- Inward m are at the unorthodox 1° ' ° _ Anode 72 d 02 3 read on udjsce t channels only.
Philips construction. 3° s _ T grid V3 and em background.

Medium Wanna-Tune service oscillqlor to 21 .. 4.6 _ Vilma 05 LONG WAVIS (725.ng metres), *
1'? 1" Wum'nfidfi 1'5 d 1:53"! {wing 22 . 3.2 - Died-vsmanu. Similar performance to medium 15
33' or or max on "no". 33 .. 35° - finial waves. Slight side splash on
m :rtoitoubint (15 :3 fihfis bull; fiillatgntp {TI-1" g2 : mp, Deutschlmdseuder.

«also ec'l . . or r lea l- .. __ ' -
her to snoqo or Vanilla connect output meter to find T' 420 M 1" V5 Avgg'cggogpgell 113an time,
the mom"! mum I with excellent low-nuts :rsdistion'
._ ~ and sari? 01%? :ttullk. t_Speec\g
plastics. y wx m1 co ours ion an
RESISIANCES CONDENSERS generally pleasing balms on
B. Plume. , 011m. 0 M orchestral music. Ample volume
; antam .. .. 300,000 in m m "dim mm
a Viral-lessorld 21 II mail 5 aiming j 3 mm as and, without nearing the resolver
1 V2 A.V.C. feed . . . . 800,000 17 LW. sum fixed . , .oooos tuning control. adjust. P1 {or maximum. .
a V2 summJ . 50,000 18 Vlgridlsolshing . . . .0001 Radian 15. 16 and '1'] an is 1.402 m. usual
0 V2 m potr.( 32,000 lo V1 cathode Mu shunt . . .1 with Bank wnoellser in six.
to v1 3,000 21 wwaynpnng .. .. .0901 _l.oug Walnut-With lulu: oondeuser set to
6 pl 22 VBusthode Mu shunt .. .1 Jig. tune oscillator to 406 Run and unjust 18.
V 500 23 V2 mean doooupluig .. 1 19 and T10 for minimum. Remove ilk. -
50,000 24 V1 screen Ind V2 mode 32 oil-cult ms to chassis. tuna oscillator to 160 m.
1.2611108. deeou ling. moonnoot aperiodic swlifier and output meter
20,000 25 One. gulf . . . . . .00005 to amplifier. .
mo 20 s.w.ose. fixed psddes .. .0045 Time in 160 Ros. slums/l on resolver to
320 27 le. use. find was: . , .0004 resonance in output motor. dlsoonneot amplifier.
, 50.000 93 A.V.C. llnedeoou rig . . J reconnect out-out meter to receiver. remoye short
29 um prim. h'llnmsr .ooos trolls 025 and. without littering the tuning eon-
600.000 30 T1 sec. swimmer .0001 trol, mint P2 tor msxllnum. ,.
50,000 81 1 .05 Reallgn T8, T9 and T10 on a 405 kos. signal.
350,000 32 VBosthodn .05 slur; Vilma-With mtg lot in fin. tune
times. as 1.2.12 1111meth .000103 a serum oscillstor to 17 mos, jostling
040,000 84 I.F.'l2|oc. thnmer . .000103 through in SW. dummy aerial, screw 1 night
2mg. 35 A.V.C.d.|ode coupling .ooooa up and then unscrew until the first post is
040,000 F. heard. Thou adjust T12 and than T13 for nui-
lme . . . mum. Renew Jig. .
l, anthraflom-Surltch recolver to le. bond.
100 set oscillator'to 370 metres (811 km). i089. ii
200 spot on rooelver. Adjust the wavelonzth~dinl
100 {clutter by means of the knurled screw salt-hat
50.09.; be pointer roads 370 metres. . ,
2,000 .. Exact roulloelnsnt condensers available from
.. u go natty? film Lane. yanawflh.
.. no, ...or eéSOAare: or P's.
mutton .. . 05 '13.; m, 2989 7s. 611.; 064, «m, 6!. 5a.; 761'
as. 2913. 15. 9s
VOLUME TUNING
ON/OFF H . r W6
R33 3% m I
' C I V1
Pl 3- omz 5
g a. 1
7 m it
1. .__Y
is, a , c
GRAN mm MAINS . .
/RkDi0 mm Animus!" L s A E

nu.
GR""Viiiolo

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