Philips bx 685 u

Page 1

STRICTLY CONFIDENTIAL

FOE Hull
$EKV|OE DEALEIU ONLY

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1949 For Len-led d.c.ana tuppliel
I 5 GENERAL
VB Mums . GWE ammo! .-
5.11.1 : [1,! - 11.6.! I ) lnen um: I gut-up u mpgting unlt nu tube
- ' Iled. '3:- In t u pp! ed 11 ,the 1):an
51h : 13.1»- 1; v I ( 9. m It: mum name: ,4; M t gnu rut
' '20 I budsptead g I) run 1: proudest an int uhst. 15.45
§.I.s : u - 15,; (15.19413, lie/l) QM/1n Mr-51 It hutaehe lnaulle Ind
' a: I magnet holit :- uncut. -. 1
8.1.4 : u. . 31.3 I (.5 4'0. lac/s) ' ,;
' a I bends read cmmr ANALYSIS
51.5 : :1 . 42.5 I ( I
40 mm
s.l.o : s1 - 50.! I ( a.
so I The world": am at mneoelver x: at»

S.l.1 : 50 -150. l ( 6 - 2 Iii/5)
: 135 - 580 l (1020 420 kc/l)

g : we: end actuator velve.
3 J puffing valve

33 : 11 velve

Bi 2 ulve em: detectur
BS 1 vllve

BA! 9 mm . .nect ymg'ulve

Ll my L1 :- ax norm-on

hummus

Blight : 40 1th the out twice aaln)
Length : 5'! knob: mcluded)

Iudth : 24.5 a

mum

9.3 kg.. nlves men-dam

museum

me In. non-n5.

mum

t. The LP. hmnflth (1:11)) Iluured tro- themon-
ttol 1a or vane 31 noun to than: 10. Ic/I.
nth e tune qmtrol hon gnu out (postman
nun magma kc]! u h the tune ennunl

knob hed 1:» position nae).

t. 4"; 3: mm" '::
mum talc n-
wauufimfivtm control mu

W'(pnq1t1qnlelllu.rm about 16 kc/u

e tyne'ehhtm up}: pushed in (mutton V

mum mum
mun" to 452» an

my"; in ihe.uet'her1enan

um over 6 liming!» broadcast; Sholh
II" buds, the 50 40. 30,15, 20 And 18 I
hum: Ire urn-4.4%» "venue uttehed an

1! the hottnI mtnt can he retd on the din.
nun Illtcmngmw to other leveling, this
61-1 1: hem: that, In or dm.,ne ml-
lldtll at the receive; can herlhcreued h] pueb-
mg an the tuhevontnljanh. melvoluu 1A
ttol 1: Inch mum the vu1m~chntxol knob
1n the may Imam no jam 1:: annu-
non acme, {; Inverse teedmkfinylnlo [cpl
tune can t on 1k It the n- tlIe 'Ipplied, In:
the 19' I _ :Lhejer. .h toul.ltth thejone
control had; In! t- , t

:01 mm Hanan mule; A: 13 I lot-rune or
I dfltlflt Ielk mutter 1m or Inhdut
ewe-head Ipueh. >

I.F4 PART

A emu circuit than for the 31.12: ex
the SJ. range 1: 51m: in nu. 1mm can!
In: use vlnhuu s. . [angel are given 1!: we
able. SK: 3: the "Itch Iezunt
m1 ah the "males-nut H032

Lesa.

, («I Ind
an the men lepeht no. a In an the II:-
Ient None.

5. sh Sc s4
3.1.1 55 u su' 522
.2 51 as 32: In
5.1.: 39 , no 525 32:
a. su - sq 527 , 323
3.1.5 513 sa- , 'm sea
31.9 . 51: an 331 882

em iutcnea mud an are closed ro': 4'

those cone inch-(n no: 1:: use; this he:
. i *

Is'm'omms» ., ,

Page 2

2 meet:

been done to Hold uhdeeired napping er s
treqnoncy men is ehuni to the reionhhce
frequehcggotn coil Ihlch is not switched

on D! III III gnuhiinz or the coils,

'iho persllei tin-err a4 and cu are ed-
inetcd in CM S.l.:hend 2 (ii-20,]. [Lite
other SJ. bends need only he "heal

the love: frequencies on the dial. me
trio-in: is done I: the sdjnetnent or copper
coil cores lhlch v en inserted center e de-
crease oi self-induction.

D' tiding the short-wove rehze into 6 tends is
none by fltheI-lnfi the cspecztance mutation
at the tuning can enter hy connecting a com
denser or at pr in series lith the tuning
condenser.

'lhrl lilo provides for bindsfibld It the lov-
er rre oeheies on the din. 1.5 can be ex-
:llihe he toilole: the condenser at 31 W
as little Influence upon the nail whines,
ill-3o pr or the tuning condenser (It higher
frequencies on the dial). he soon A: the- -
tuning clpwity lhereneel this condense!
tterts to pin] 1 grenter part, For nines or
250 17 end higher at the tuning condenser the
tote tuning ch city inerenses only very
little to [DOE dlptow 15 0112111126 over
this plru'lhe trend oi this tenacity is given

in I r 2.

The finding or me SJ rsnee is Inch the:

the bond-Inn SJ. hand: (All in the hand-
Ipreed rrt. ey lie ill on top or etch other
on the ill. 'lhll connection III! the nautical).
envutee thee the itching over tron one brand-
casting hand to the other csn he done by Ierely
turning the vsve-rnnpe "itch.

I . F. PART

By resting in the tone control knob the LF.
binsudth it lucrensed and one hereby ohttine
the overeil hsodvidth Ilth 1 better reproduction
or the high notes. inereuihg the hehnvioth is
doh'e in increasing the con lin o! the first
I. hlhdlilter vith the: d h In mditiml
co ling coil vhtch iszlteheo on by pressing
in {he one control knob.
'ihe diodes or veive M (haul) Ire used tor
oeteetion end the i.v.c.
'ihe authentic voinneontrol it deleynd hy eon.
heetins the.hottnl at the AJLC. detection re-
sistor hi: to s hesltive vultlge. 'lhe negative
voltage is ohtelhe iron the voltrzeeirop neross
the resistor Ii! Ihrvuah Ihieh tho toui vllve
torrent or the receiver tiovs.
i.r. Pm
VOUME mm
The circuit new or the LE volume control
is given in t . 3.
SM sillehd- 5 Ire rte at the secondnry
lindincnt the output ttnhsrnrler. 'lhe negltive
(redneck voitlge orevn lags: sister?! 35o 2::
unused-lime ii Ipo ie a on. Do ,
or the value ontrol vie his end in! and win
1118. hood 4 respectively. This he tive
tecohlckJoltue, holevet, is ptstticn 1y neu-
txilized hy the ositive feedback voiuge vhich
is'drllh sense 5! RI end filo and npglied
to thetnh, p'oint u. or the rnlule eontro . no
that vith the riioeron top (value control It
hexane) there it no teedheck. mis hi! the no-
vtntrg' thet tor the reception or veek stations
uth tfie vniole- control It neuron the highest
lensitivity required, is chaired Is the npii< »
mum does not. suffer my losers iron negl- v
tive :than ,
Iheh theivolule~ eontroi knob is turned to n
einuu. the hes-tinteedhtct inereeee: u the
influence or the positive teedheer voitnge
terns-JIM to at: note end Iore reduced.

rquamlsm. mm mm:

weer u it tnil volune sensitive to tones

vith 1 frequency or Ihoot 3500 oil mile the

«r is it till! sound voiune insensitive to m

and very high tonee._"roeo ate in: this phy-

Iiolozicei one correction hpplied vhich 5

put into in eretiohvhen the value control not

it turned o e nihinus venue.

a. me connensation tor the inreheitivity for
lov tones is here ohtsihed by ineteesing the
negative teedhnck for the higher tones when
the Value control is turned to Iinllnn vo-
lune. his is done hy the cnpncitor C23 e-
ernss Rid. 1n:- cepscitor torn I hettel on.
size for higher frequency or the nptive
reedheek volt: than vin his vith the remit
thnt in point the negntive teedheck in the
him tones inereeeee. .

n. he coupenution tor the insenhitlvlty to
verkhlu tone: 1! obtained by: »

1. evupacitor, can; vie this 0 ltor the
potltive teedneek voltage in t every high
tones ll applied to hint 'r. 1'

L The especitot a4; v n this cspecitot the
stall tor the very high tones find: i

i better size to the slider in roportioh

to the ecrule of relistnnee he veeh
point u end-the slider. (Volnne control
tuning to uni-us position).

marina.

'ihe tone control 1

1190 ll In 1160 VG!
is lined on three mi- 1

mu. vi: the tone control

no . .

i. rosition for in tone . tot ee tion at
stations nth fldezhnaf 10?. P

2. Position tor hoth lol. toner -que-
lity politinn indie-ted h] e stop.

3. Position tor high tmei - speech polition.

By writing the tone control rm it-il hov poe-
:ggéengo choose the heeteomiition {or each re-
'lhe characteristics or the three poeitihns ere
ingiagdclhtglg.le iggfigeee figure .

, , no son , uhle h -
an toenhielre the high end he in: tot-reef:I

(see tig.5).
the ct V mm &1 And theepotehtioleter hi1
llh Ii n40 inplrnilei' tor- a high-peel liiter

vle'tnieriiter the he etin teedhnclt tor the
highltnnel 1! applied a the id or instill
rfiptive Xeedhec is Ihx.:vlt the slider et
:13 Impflhnon tor iov tone- Ind "presses

turning the slider dolllllld this he tive teed-
WI queens u the he tive recon r voltege
it wound to the' 1!! o a vil n e or the
otentioneter hi, filing: eni . one: viil
V cone thro 'IBCh tut on ii tineiiy
t quinine: tion inreseheo vhen the high
tone h tive teedbecrvoiuge l! short-eit-
culted the u my :2 .~ .. .
lith the lilder» the he pert hie - of the
potential-flinging p . eh position -
tv . . r or- es ov tonesil In lied
V e lo! I 'f lte an end can. ht
these tones re nonpressed. '

mm

or. lanlt finding it is
the receiver tame.
ntinz trlneroner
thieh. the organs
Pa 5 g. Wihle to you
11;: Mind {of the [IMG-
lcien u there in s conden-
nu uhd,|round:,loekat.j .
e c ,euehetfpf the retina Realtor-er is
who: w: "t :2": m 12"
, rec 0 .3. II II I
sensation to 3?me > P